Pub Date : 2021-06-30DOI: 10.14407/jrpr.2021.00122
T. Fujibuchi, H. Ogino, Han Ki Taek, K. Tani, D. Emes
Dr. Haruyuki Ogino, a member of the Japan Health Physics Society (JHPS), was awarded the 2021 Bo Lindell Medal by the International Commission on Radiological Protection (ICRP). To commemorate this, the “Joint JHPS-KARP-ARPS program for young radiation protection (RP) scientists to discuss the future of RP” was organized via a web meeting system. First, Dr. Ogino gave a lecture, and then young researchers selected from each academic society made presentations on the future of RP. After the presentations by the three researchers, a free talk was held— young researcher groups of each country being active is a great opportunity to collaborate and exchange information. It was emphasized that the low awareness of knowledge related to radiation has been common to all of the participating countries. Thus, it is necessary to utilize communication via web technology, as done for this program, effectively. One of the biggest advantages for Asia and Oceania is that we do not have a significant time difference. The round-table discussion was concluded by expressing the hope of active exchange and development of young researchers in the future.
{"title":"JHPS-KARP-ARPS Joint Program for Commemoration of 2021 Bo Lindell Medal to Discuss the Future of Radiation Protection among Young Scientists and the Award Recipient, Dr. Ogino","authors":"T. Fujibuchi, H. Ogino, Han Ki Taek, K. Tani, D. Emes","doi":"10.14407/jrpr.2021.00122","DOIUrl":"https://doi.org/10.14407/jrpr.2021.00122","url":null,"abstract":"Dr. Haruyuki Ogino, a member of the Japan Health Physics Society (JHPS), was awarded the 2021 Bo Lindell Medal by the International Commission on Radiological Protection (ICRP). To commemorate this, the “Joint JHPS-KARP-ARPS program for young radiation protection (RP) scientists to discuss the future of RP” was organized via a web meeting system. First, Dr. Ogino gave a lecture, and then young researchers selected from each academic society made presentations on the future of RP. After the presentations by the three researchers, a free talk was held— young researcher groups of each country being active is a great opportunity to collaborate and exchange information. It was emphasized that the low awareness of knowledge related to radiation has been common to all of the participating countries. Thus, it is necessary to utilize communication via web technology, as done for this program, effectively. One of the biggest advantages for Asia and Oceania is that we do not have a significant time difference. The round-table discussion was concluded by expressing the hope of active exchange and development of young researchers in the future.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":"13 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84758076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.14407/jrpr.2020.00283
H. Yoshida, Y. Kuroda, Takahiko Kono, W. Naito, Akihiro Sakoda
Background: From 2018 to 2020, the Expert Study on Public Understanding after the Fukushima Daiichi Nuclear Power Plant Accident (the Expert Study Group) identified and analyzed activities designed to promote public understanding of science and radiation since the Fukushima accident, and held discussions on how to achieve public understanding in the situation where public confidence has been lost, and how experts should prepare for dealing with the public. This panel session was held at the 53rd meeting of the Japan Health Physics Society on June 30, 2020.Materials and Methods: First, three subgroup (SG) leaders reported their research methods and results. Then, two designated speakers, who participated as observers of the Expert Study Group, commented on the activities. Next, the five speakers held a panel discussion. Finally, the rapporteur summarized.Results and Discussion: SG leaders presented reports from researchers and practitioners in health physics and environmental risks who provided information after the Fukushima accident. During the discussion, experts in sociology and ethics discussed the issues, focusing on the overall goals of the three groups, local (personal) and mass communication, and ethical values. Many of the activities instituted by the experts after the accident were aimed at public understanding of science (that is, to provide knowledge to residents), but by taking into account interactions with residents and their ethical norms, the experts shifted to supporting the residents’ decision-making through public engagement. The need to consider both content and channels is well known in the field of health communication, and overlaps with the above discussion.Conclusion: How to implement and promote the public engagement in society was discussed in both the floor and designated discussions. Cooperation between local communities and organizations that have already gained trust is also necessary in order to develop relationships with local residents in normal times, to establish an information transmission system, and to make it work effectively.
{"title":"Panel Session toward Improved Communication and Engagement with the Public after the Fukushima Daiichi Nuclear Power Plant Accident: Study Reports and Discussion with Specialists from Relevant Fields","authors":"H. Yoshida, Y. Kuroda, Takahiko Kono, W. Naito, Akihiro Sakoda","doi":"10.14407/jrpr.2020.00283","DOIUrl":"https://doi.org/10.14407/jrpr.2020.00283","url":null,"abstract":"Background: From 2018 to 2020, the Expert Study on Public Understanding after the Fukushima Daiichi Nuclear Power Plant Accident (the Expert Study Group) identified and analyzed activities designed to promote public understanding of science and radiation since the Fukushima accident, and held discussions on how to achieve public understanding in the situation where public confidence has been lost, and how experts should prepare for dealing with the public. This panel session was held at the 53rd meeting of the Japan Health Physics Society on June 30, 2020.Materials and Methods: First, three subgroup (SG) leaders reported their research methods and results. Then, two designated speakers, who participated as observers of the Expert Study Group, commented on the activities. Next, the five speakers held a panel discussion. Finally, the rapporteur summarized.Results and Discussion: SG leaders presented reports from researchers and practitioners in health physics and environmental risks who provided information after the Fukushima accident. During the discussion, experts in sociology and ethics discussed the issues, focusing on the overall goals of the three groups, local (personal) and mass communication, and ethical values. Many of the activities instituted by the experts after the accident were aimed at public understanding of science (that is, to provide knowledge to residents), but by taking into account interactions with residents and their ethical norms, the experts shifted to supporting the residents’ decision-making through public engagement. The need to consider both content and channels is well known in the field of health communication, and overlaps with the above discussion.Conclusion: How to implement and promote the public engagement in society was discussed in both the floor and designated discussions. Cooperation between local communities and organizations that have already gained trust is also necessary in order to develop relationships with local residents in normal times, to establish an information transmission system, and to make it work effectively.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":"188 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75684592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.14407/jrpr.2021.00038
M. Akiyoshi, Duy Khiem Do, I. Yamaguchi, T. Kakefu, Toshiharu Miyakawa
Background: Crookes tube is utilized in junior high and high schools in Japan to study the character of electrons and current, and not for radiological education. There is no official guideline or regulation for these radiation source to the public. Therefore, most teachers have no information about the leakage of X-rays from Crookes tube. The peak energy of X-rays is approximately 20 keV, and it is impossible to measure using conventional survey meters.Materials and Methods: Each leakage dose of low energy X-rays from 38 Crookes tube in the education field, such as junior and senior high schools in Japan, was explored by the teachers in the school using radio-photoluminescence (RPL) dosimeters. Before and after the measurements, the dosimeters were sent by postal mails.Results and Discussion: At the exploration in this study, it was estimated that the 70 μm dose equivalent, Hp(0.07) of X-rays from 31 Crookes tubes were smaller than 100 μSv in 10 minutes, at the distance of 1 m, where the Crookes tube was usually observed. However, the highest dose was estimated as 0.69 mSv by an equipment with the full power. Furthermore, one Crookes tube exhibited 0.62 mSv with minimum output power of the induction coil. This relatively large dose was reduced by the shorter distance of discharge electrodes of the induction coil.Conclusion: The leakage dose of low energy X-rays from 38 Crookes tube was explored using RPL dosimeters. It was estimated that the Hp(0.07) of X-rays from 31 Crookes tubes were smaller than 100 μSv in 10 minutes at the distance of 1 m, while some equipment radiated a higher dose. With this study, the provisional guideline for the safety operation of Crookes tube is established.
{"title":"Radiation Safety Exploration Using Radio-photoluminescence Dosimeter for Crookes Tubes in Junior and Senior High School in Japan","authors":"M. Akiyoshi, Duy Khiem Do, I. Yamaguchi, T. Kakefu, Toshiharu Miyakawa","doi":"10.14407/jrpr.2021.00038","DOIUrl":"https://doi.org/10.14407/jrpr.2021.00038","url":null,"abstract":"Background: Crookes tube is utilized in junior high and high schools in Japan to study the character of electrons and current, and not for radiological education. There is no official guideline or regulation for these radiation source to the public. Therefore, most teachers have no information about the leakage of X-rays from Crookes tube. The peak energy of X-rays is approximately 20 keV, and it is impossible to measure using conventional survey meters.Materials and Methods: Each leakage dose of low energy X-rays from 38 Crookes tube in the education field, such as junior and senior high schools in Japan, was explored by the teachers in the school using radio-photoluminescence (RPL) dosimeters. Before and after the measurements, the dosimeters were sent by postal mails.Results and Discussion: At the exploration in this study, it was estimated that the 70 μm dose equivalent, Hp(0.07) of X-rays from 31 Crookes tubes were smaller than 100 μSv in 10 minutes, at the distance of 1 m, where the Crookes tube was usually observed. However, the highest dose was estimated as 0.69 mSv by an equipment with the full power. Furthermore, one Crookes tube exhibited 0.62 mSv with minimum output power of the induction coil. This relatively large dose was reduced by the shorter distance of discharge electrodes of the induction coil.Conclusion: The leakage dose of low energy X-rays from 38 Crookes tube was explored using RPL dosimeters. It was estimated that the Hp(0.07) of X-rays from 31 Crookes tubes were smaller than 100 μSv in 10 minutes at the distance of 1 m, while some equipment radiated a higher dose. With this study, the provisional guideline for the safety operation of Crookes tube is established.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":"226 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78478486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.14407/jrpr.2021.00262
Hyun Suk Kim, Jooyub Lee, S. Choi, Y. Bang, S. Ye, Geehyun Kim
Background: This work aims to develop a new imaging system based on a pulse shape discrimination-capable Cs2LiYCl6:Ce (CLYC) scintillation detector combined with the rotational modulation collimator (RMC) technique for dual-particle imaging.Materials and Methods: In this study, a CLYC-based RMC system was designed based on Monte Carlo simulations, and a prototype was fabricated. Therein, a rotation control system was developed to rotate the RMC unit precisely, and a graphical user interface-based software was also developed to operate the data acquisition with RMC rotation. The RMC system was developed to allow combining various types of collimator masks and detectors interchangeably, making the imaging system more versatile for various applications and conditions.Results and Discussion: Operational performance of the fabricated system was studied by checking the accuracy and precision of the collimator rotation and obtaining modulation patterns from a gamma-ray source repeatedly.Conclusion: The prototype RMC system showed reliability in its mechanical properties and reproducibility in the acquisition of modulation patterns, and it will be further investigated for its dual-particle imaging capability with various complex radioactive source conditions.
{"title":"Design and Fabrication of CLYC-Based Rotational Modulation Collimator (RMC) System for Gamma-Ray/Neutron Dual-Particle Imager","authors":"Hyun Suk Kim, Jooyub Lee, S. Choi, Y. Bang, S. Ye, Geehyun Kim","doi":"10.14407/jrpr.2021.00262","DOIUrl":"https://doi.org/10.14407/jrpr.2021.00262","url":null,"abstract":"Background: This work aims to develop a new imaging system based on a pulse shape discrimination-capable Cs2LiYCl6:Ce (CLYC) scintillation detector combined with the rotational modulation collimator (RMC) technique for dual-particle imaging.Materials and Methods: In this study, a CLYC-based RMC system was designed based on Monte Carlo simulations, and a prototype was fabricated. Therein, a rotation control system was developed to rotate the RMC unit precisely, and a graphical user interface-based software was also developed to operate the data acquisition with RMC rotation. The RMC system was developed to allow combining various types of collimator masks and detectors interchangeably, making the imaging system more versatile for various applications and conditions.Results and Discussion: Operational performance of the fabricated system was studied by checking the accuracy and precision of the collimator rotation and obtaining modulation patterns from a gamma-ray source repeatedly.Conclusion: The prototype RMC system showed reliability in its mechanical properties and reproducibility in the acquisition of modulation patterns, and it will be further investigated for its dual-particle imaging capability with various complex radioactive source conditions.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83451314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-30DOI: 10.14407/JRPR.2020.45.4.171
Seongmoon Jung, Bitbyeol Kim, Jung In Kim, Jong Min Park, C. Choi
1Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea; 2Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea; 3Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea; 4Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea; 5Robotics Research Laboratory for Extreme Environments, Advanced Institute of Convergence Technology, Suwon, Korea
{"title":"Deriving the Effective Atomic Number with a Dual-Energy Image Set Acquired by the Big Bore CT Simulator","authors":"Seongmoon Jung, Bitbyeol Kim, Jung In Kim, Jong Min Park, C. Choi","doi":"10.14407/JRPR.2020.45.4.171","DOIUrl":"https://doi.org/10.14407/JRPR.2020.45.4.171","url":null,"abstract":"1Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea; 2Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea; 3Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea; 4Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea; 5Robotics Research Laboratory for Extreme Environments, Advanced Institute of Convergence Technology, Suwon, Korea","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":"3 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85256644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-30DOI: 10.14407/JRPR.2020.45.4.178
K. Park, Hae-Woong Kim, Heedong Sohn, Nam-Kyun Kim, Chung-Kyu Lee, Yun-Do Lee, Jihoon Lee, Young Hwan Hwang, Mi Hyun Lee, Dong Kyu Lee, Duk Woon Jung
Results and Discussion: Through neutron activation analysis, dose rate is evaluated for the casks containing cut-off pieces produced from decommissioned RV and RVI. For RV cut-off ones, the highest value of dose rate on the surface of cask is 6.97 × 10-1 mSv/hr and 2 m from it is 3.03 × 10-2 mSv/hr. For RVI cut-off ones, on the surface of it is 0.166 × 10-1 mSv/hr and 2 m from it is 1.04 × 10-1 mSv/hr. Dose rates for various RV and RVI cut-off pieces distributed lower than the limit except the one of 2 m from the cask surface of RVI. It needs to adjust contents in cask which carries highly radioactive components in order to decrease thickness of cask.
{"title":"Study on Dose Rate on the Surface of Cask Packed with Activated Cut-off Pieces from Decommissioned Nuclear Power Plant","authors":"K. Park, Hae-Woong Kim, Heedong Sohn, Nam-Kyun Kim, Chung-Kyu Lee, Yun-Do Lee, Jihoon Lee, Young Hwan Hwang, Mi Hyun Lee, Dong Kyu Lee, Duk Woon Jung","doi":"10.14407/JRPR.2020.45.4.178","DOIUrl":"https://doi.org/10.14407/JRPR.2020.45.4.178","url":null,"abstract":"Results and Discussion: Through neutron activation analysis, dose rate is evaluated for the casks containing cut-off pieces produced from decommissioned RV and RVI. For RV cut-off ones, the highest value of dose rate on the surface of cask is 6.97 × 10-1 mSv/hr and 2 m from it is 3.03 × 10-2 mSv/hr. For RVI cut-off ones, on the surface of it is 0.166 × 10-1 mSv/hr and 2 m from it is 1.04 × 10-1 mSv/hr. Dose rates for various RV and RVI cut-off pieces distributed lower than the limit except the one of 2 m from the cask surface of RVI. It needs to adjust contents in cask which carries highly radioactive components in order to decrease thickness of cask.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":"27 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87397492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-30DOI: 10.14407/JRPR.2020.45.4.147
E. W. Katengeza
Materials and Methods: This paper challenges the scope of the policy on nuclear power by reviewing its implementation strategy and comparing it to: the strategy established for coal in the same policy; some experiences from other countries; and documents by the International Atomic Energy Agency (IAEA) relating to establishing a national position on nuclear power and infrastructural requirements for a nuclear power program.
{"title":"A Brief Scrutiny of Malawi’s Policy on Nuclear Power","authors":"E. W. Katengeza","doi":"10.14407/JRPR.2020.45.4.147","DOIUrl":"https://doi.org/10.14407/JRPR.2020.45.4.147","url":null,"abstract":"Materials and Methods: This paper challenges the scope of the policy on nuclear power by reviewing its implementation strategy and comparing it to: the strategy established for coal in the same policy; some experiences from other countries; and documents by the International Atomic Energy Agency (IAEA) relating to establishing a national position on nuclear power and infrastructural requirements for a nuclear power program.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":"193 6 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78326309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-30DOI: 10.14407/jrpr.2020.45.3.117
Hyun Cheol Lee, B. Koo, Chang-Il Choi, C. Park, J. Kwon, H. Kim, Heejun Chung, C. Min
Background: Radiation portal monitors (RPMs) involving plastic scintillators installed at the border inspection sites can detect illicit trafficking of radioactive sources in cargo containers within seconds. However, RPMs may generate false alarms because of the naturally occurring radioactive materials. To manage these false alarms, we previously suggested an energy-weighted algorithm that emphasizes the Compton-edge area as an outstanding peak. This study intends to evaluate the identification of radioactive sources using an improved energy-weighted algorithm.
{"title":"Evaluation of Source Identification Method Based on Energy-Weighting Level with Portal Monitoring System Using Plastic Scintillator","authors":"Hyun Cheol Lee, B. Koo, Chang-Il Choi, C. Park, J. Kwon, H. Kim, Heejun Chung, C. Min","doi":"10.14407/jrpr.2020.45.3.117","DOIUrl":"https://doi.org/10.14407/jrpr.2020.45.3.117","url":null,"abstract":"Background: Radiation portal monitors (RPMs) involving plastic scintillators installed at the border inspection sites can detect illicit trafficking of radioactive sources in cargo containers within seconds. However, RPMs may generate false alarms because of the naturally occurring radioactive materials. To manage these false alarms, we previously suggested an energy-weighted algorithm that emphasizes the Compton-edge area as an outstanding peak. This study intends to evaluate the identification of radioactive sources using an improved energy-weighted algorithm.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":"192 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76570215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-30DOI: 10.14407/jrpr.2019.44.4.156
So-Hyun Park, W. Choi, Jinhyun Choi
Background: To compare the dose of radiation received by the fetus in a pregnant patient irra-diated for head and neck cancer using helical tomotherapy and three-dimensional conformal radiation therapy (3DCRT). Materials and Methods: The patient was modeled with a humanoid phantom to mimic a gestation of 26 weeks. Radiotherapy with a total dose of 2 Gy was delivered with both tomotherapy (2.5 and 5.0 cm jaw size) and 3DCRT. The position of the fetus was predicted to be 45 cm from the field edge at the time of treatment. The delivered dose was measured according to the distance from the field edge and the fetus. Results and Discussion: The accumulated dose to the fetus was 1.6 cGy by 3DCRT and 2 and 2.3 cGy by the 2.5 and 5 cm jaw tomotherapy plans. For tomotherapy, the fetal dose with the 2.5 cm jaw was lower than that with the 5 cm jaw, although the radiation leakage was greater for 2.5 cm jaw plan due to the 1.5 fold longer beam-on time. At the uterine fundus, tomotherapy with a 5 cm jaw delivered the highest dose of 2.4 cGy. When the fetus moves up to 35 cm at the 29th week of gestation, the resultant fetal doses for 3DCRT and tomotherapy with 2.5 and 5 cm jaws were estimated as 2.1, 2.7, and 3.9 cGy, respectively. Conclusion: For tomotherapy, scattering radiation was more important due to the high monitor unit values. Therefore, selecting a smaller jaw size for tomotherapy may reduce the fetal dose. however, evaluation of risk should be individually performed for each patient.
{"title":"Fetal dose from Head and Neck Tomotherapy Versus 3D Conformal Radiotherapy","authors":"So-Hyun Park, W. Choi, Jinhyun Choi","doi":"10.14407/jrpr.2019.44.4.156","DOIUrl":"https://doi.org/10.14407/jrpr.2019.44.4.156","url":null,"abstract":"Background: To compare the dose of radiation received by the fetus in a pregnant patient irra-diated for head and neck cancer using helical tomotherapy and three-dimensional conformal radiation therapy (3DCRT). Materials and Methods: The patient was modeled with a humanoid phantom to mimic a gestation of 26 weeks. Radiotherapy with a total dose of 2 Gy was delivered with both tomotherapy (2.5 and 5.0 cm jaw size) and 3DCRT. The position of the fetus was predicted to be 45 cm from the field edge at the time of treatment. The delivered dose was measured according to the distance from the field edge and the fetus. Results and Discussion: The accumulated dose to the fetus was 1.6 cGy by 3DCRT and 2 and 2.3 cGy by the 2.5 and 5 cm jaw tomotherapy plans. For tomotherapy, the fetal dose with the 2.5 cm jaw was lower than that with the 5 cm jaw, although the radiation leakage was greater for 2.5 cm jaw plan due to the 1.5 fold longer beam-on time. At the uterine fundus, tomotherapy with a 5 cm jaw delivered the highest dose of 2.4 cGy. When the fetus moves up to 35 cm at the 29th week of gestation, the resultant fetal doses for 3DCRT and tomotherapy with 2.5 and 5 cm jaws were estimated as 2.1, 2.7, and 3.9 cGy, respectively. Conclusion: For tomotherapy, scattering radiation was more important due to the high monitor unit values. Therefore, selecting a smaller jaw size for tomotherapy may reduce the fetal dose. however, evaluation of risk should be individually performed for each patient.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":"13 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84939665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-09-30DOI: 10.14407/jrpr.2019.44.3.103
Hyun Su Lee, Chansoo Choi, Chan Hyeong Kim, M. Han, Y. Yeom, T. Nguyen, Seonghoon Kim, S. Choi, S. Lee, Jina Kim, Jinho Hwang, Y. Kang
1Department of Nuclear Engineering, Hanyang University, Seoul, Korea; 2Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Korea; 3Division of Cancer Epidemiology & Genetics, National Cancer Institute, MD, USA; 4School of Nuclear Engineering and Environmental Physics, Hanoi University of Science and Technology, Ha Noi, Viet Nam; 5Department of Radiation Oncology, College of Medicine, Hanyang University, Seoul, Korea; 6Korea Institute of Radiological and Medical Sciences, Seoul, Korea; 7The Catholic University of Korea, Seoul, Korea
{"title":"Extra-phase Image Generation for Its Potential Use in Dose Evaluation for a Broad Range of Respiratory Motion","authors":"Hyun Su Lee, Chansoo Choi, Chan Hyeong Kim, M. Han, Y. Yeom, T. Nguyen, Seonghoon Kim, S. Choi, S. Lee, Jina Kim, Jinho Hwang, Y. Kang","doi":"10.14407/jrpr.2019.44.3.103","DOIUrl":"https://doi.org/10.14407/jrpr.2019.44.3.103","url":null,"abstract":"1Department of Nuclear Engineering, Hanyang University, Seoul, Korea; 2Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Korea; 3Division of Cancer Epidemiology & Genetics, National Cancer Institute, MD, USA; 4School of Nuclear Engineering and Environmental Physics, Hanoi University of Science and Technology, Ha Noi, Viet Nam; 5Department of Radiation Oncology, College of Medicine, Hanyang University, Seoul, Korea; 6Korea Institute of Radiological and Medical Sciences, Seoul, Korea; 7The Catholic University of Korea, Seoul, Korea","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":"94 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74973191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：