Pub Date : 2019-03-31DOI: 10.14407/JRPR.2019.44.1.26
J. Son, H. An, C. Choi, E. Chie, J. Kim, Jong Min Park, Jung In Kim
Background: Stereotactic ablative radiotherapy (SABR) plans in prostate cancer are compared and analyzed to investigate the low magnetic effect (0.35 T) on the dose distribution, with various dosimetric parameters according to low magnetic field. Materials and Methods: Twenty patients who received a 36.25 Gy in five fractions using the MR-IGRT system (ViewRay) were studied. For planning target volume (PTV), the point mean dose (Dmean), maximum dose (Dmax), minimum dose (Dmin) and volumes receiving 100% (V100%), 95% (V95%), and 90% (V90%) of the total dose. For organs-at-risk (OARs), the differences compared using Dmax, V50%, V80%, V90%, and V100% of the rectum; Dmax, V50%, V30Gy, V100% of the bladder; and V30Gy of both left and right femoral heads. For both the outer and inner shells near the skin, Dmean, Dmin, and Dmax were compared. Results and Discussion: In PTV analysis, the maximum difference in volumes (V100%, V95%, and V90%) according to low magnetic field was 0.54 ± 0.63% in V100%. For OAR, there was no significant difference of dose distribution on account of the low magnetic field. In results of the shells, although there were no noticeable differences in dose distribution, the average difference of dose distribution for the outer shell was 1.28 ± 1.08 Gy for Dmax. Conclusion: In the PTV and OARs for prostate cancer, there are no statistically-significant differences between the plan calculated with and without a magnetic field. However, we confirm that the dose distribution significantly increases near the body shell when a magnetic field is applied.
{"title":"Assessment of Dose Distributions According to Low Magnetic Field Effect for Prostate SABR","authors":"J. Son, H. An, C. Choi, E. Chie, J. Kim, Jong Min Park, Jung In Kim","doi":"10.14407/JRPR.2019.44.1.26","DOIUrl":"https://doi.org/10.14407/JRPR.2019.44.1.26","url":null,"abstract":"Background: Stereotactic ablative radiotherapy (SABR) plans in prostate cancer are compared and analyzed to investigate the low magnetic effect (0.35 T) on the dose distribution, with various dosimetric parameters according to low magnetic field. Materials and Methods: Twenty patients who received a 36.25 Gy in five fractions using the MR-IGRT system (ViewRay) were studied. For planning target volume (PTV), the point mean dose (Dmean), maximum dose (Dmax), minimum dose (Dmin) and volumes receiving 100% (V100%), 95% (V95%), and 90% (V90%) of the total dose. For organs-at-risk (OARs), the differences compared using Dmax, V50%, V80%, V90%, and V100% of the rectum; Dmax, V50%, V30Gy, V100% of the bladder; and V30Gy of both left and right femoral heads. For both the outer and inner shells near the skin, Dmean, Dmin, and Dmax were compared. Results and Discussion: In PTV analysis, the maximum difference in volumes (V100%, V95%, and V90%) according to low magnetic field was 0.54 ± 0.63% in V100%. For OAR, there was no significant difference of dose distribution on account of the low magnetic field. In results of the shells, although there were no noticeable differences in dose distribution, the average difference of dose distribution for the outer shell was 1.28 ± 1.08 Gy for Dmax. Conclusion: In the PTV and OARs for prostate cancer, there are no statistically-significant differences between the plan calculated with and without a magnetic field. However, we confirm that the dose distribution significantly increases near the body shell when a magnetic field is applied.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84293610","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 : 2019-03-30DOI: 10.14407/JRPR.2019.44.1.43
Mohammad Mahfujur Rahman, Chan Hyeong Kim, Seonghoon Kim
Background: The mid-term performance of clinical linear accelerator (LINAC) during volumetric modulated arc therapy (VMAT) treatment period is not performed in clinical practice and usually replaced with one-time plan quality assurance (QA). In this research we aim to monitor daily reproducibility of VMAT delivery from tracking individual leaf movement error and dosimetric error to evaluate the mid-term quality of the machine used. Materials and Methods: First, multileaf collimator (MLC) information was imported into MATLAB program to determine which of the MLC leaves in the leaf bank had the maximum RMS position error (maxRMS). We estimated where the maximum positional errors (maxPE) of the chosen leaf occur along its path length and tracked its daily variations over the entire treatment period. Secondly, picture information of dosimetric error from portal dosimetry was imported into MATLAB where representative high gamma index region (HGR) was determined as HGR with length of > 1 cm and their centers were daily tracked. Results and Discussion: The maxPEs in the brain and tongue cases were distributed broader than in other cases, but all data were found located within ± 0.5 mm. From first day to last day all of five cases show the similar visual pattern of HGRs and Centers of the longest HGRs re-mained within ± 1 mm of that in first day. These findings prove excellent mid-term performance of the LINAC used in VMAT treatments over a full course of treatment. Conclusion: Tracking the daily location changes of leaf movement and dosimetric error can be a good indicator of predicting the daily quality like stability and reproducibility of beam delivering in VMAT treatment.
{"title":"Mid-Term Performance of Clinical LINAC in Volumetric Modulated Arc Therapy","authors":"Mohammad Mahfujur Rahman, Chan Hyeong Kim, Seonghoon Kim","doi":"10.14407/JRPR.2019.44.1.43","DOIUrl":"https://doi.org/10.14407/JRPR.2019.44.1.43","url":null,"abstract":"Background: The mid-term performance of clinical linear accelerator (LINAC) during volumetric modulated arc therapy (VMAT) treatment period is not performed in clinical practice and usually replaced with one-time plan quality assurance (QA). In this research we aim to monitor daily reproducibility of VMAT delivery from tracking individual leaf movement error and dosimetric error to evaluate the mid-term quality of the machine used. Materials and Methods: First, multileaf collimator (MLC) information was imported into MATLAB program to determine which of the MLC leaves in the leaf bank had the maximum RMS position error (maxRMS). We estimated where the maximum positional errors (maxPE) of the chosen leaf occur along its path length and tracked its daily variations over the entire treatment period. Secondly, picture information of dosimetric error from portal dosimetry was imported into MATLAB where representative high gamma index region (HGR) was determined as HGR with length of > 1 cm and their centers were daily tracked. Results and Discussion: The maxPEs in the brain and tongue cases were distributed broader than in other cases, but all data were found located within ± 0.5 mm. From first day to last day all of five cases show the similar visual pattern of HGRs and Centers of the longest HGRs re-mained within ± 1 mm of that in first day. These findings prove excellent mid-term performance of the LINAC used in VMAT treatments over a full course of treatment. Conclusion: Tracking the daily location changes of leaf movement and dosimetric error can be a good indicator of predicting the daily quality like stability and reproducibility of beam delivering in VMAT treatment.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2019-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78371997","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 : 2019-03-30DOI: 10.14407/JRPR.2019.44.1.8
D. Keum, H. Jeong, I. Jun, K. Lim, Y. Choi, So-Hyeon Lee, Tae-Jong Jung
Materials and Methods: Agricultural countermeasures suitable for domestic farming environments were selected by referring to the countermeasures applied after the Fukushima accident in Japan. The avertable ingestion doses that could be obtained by implementing the selected countermeasures were calculated using the Korean Agricultural Countermeasure Analysis Program (K-ACAP) to investigate the efficiency of each countermeasure.
{"title":"Effect of Agricultural Countermeasures on Ingestion Dose Following a Nuclear Accident","authors":"D. Keum, H. Jeong, I. Jun, K. Lim, Y. Choi, So-Hyeon Lee, Tae-Jong Jung","doi":"10.14407/JRPR.2019.44.1.8","DOIUrl":"https://doi.org/10.14407/JRPR.2019.44.1.8","url":null,"abstract":"Materials and Methods: Agricultural countermeasures suitable for domestic farming environments were selected by referring to the countermeasures applied after the Fukushima accident in Japan. The avertable ingestion doses that could be obtained by implementing the selected countermeasures were calculated using the Korean Agricultural Countermeasure Analysis Program (K-ACAP) to investigate the efficiency of each countermeasure.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2019-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89651135","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 : 2018-12-30DOI: 10.14407/JRPR.2018.43.4.160
Chang-Young Park, Young-Kook Park, K. Chung, Jong-Duk Lee, Jungil Lee, Jang-Lyul Kim
Background: This study aims to develop an integrated optical system that can simultaneously or selectively measure the signals obtained from radioluminescence (RL), thermoluminescence (TL), and optically stimulated luminescence (OSL), which are luminescence phenomena of materials stimulated by radioactivity, heat, and light, respectively. The luminescence mechanism of various materials could be investigated using the glow curves of the luminescence materials.
{"title":"An Integrated System for Radioluminescence, Thermoluminescence and Optically Stimulated Luminescence Measurements","authors":"Chang-Young Park, Young-Kook Park, K. Chung, Jong-Duk Lee, Jungil Lee, Jang-Lyul Kim","doi":"10.14407/JRPR.2018.43.4.160","DOIUrl":"https://doi.org/10.14407/JRPR.2018.43.4.160","url":null,"abstract":"Background: This study aims to develop an integrated optical system that can simultaneously or selectively measure the signals obtained from radioluminescence (RL), thermoluminescence (TL), and optically stimulated luminescence (OSL), which are luminescence phenomena of materials stimulated by radioactivity, heat, and light, respectively. The luminescence mechanism of various materials could be investigated using the glow curves of the luminescence materials.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76364071","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 : 2018-12-30DOI: 10.14407/JRPR.2018.43.4.137
J. Byun
{"title":"A Copper Shield for the Reduction of X-γ True Coincidence Summing in Gamma-ray Spectrometry","authors":"J. Byun","doi":"10.14407/JRPR.2018.43.4.137","DOIUrl":"https://doi.org/10.14407/JRPR.2018.43.4.137","url":null,"abstract":"","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88307340","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 : 2018-12-30DOI: 10.14407/JRPR.2018.43.4.143
Bong-Gi Kim, Wi-Ho Ha, Tae-Eun Kwon, Jun-Ho Lee, Kyu-Hwan Jung
Background: The determination of the amount of radionuclides and internal dose for the worker who may have intake of radionuclides results in a variation due to uncertainty of measurement data and ingestion information. As a result of this, it is possible that for the same internal exposure scenario assessors could make considerably different estimation of internal dose. In order to reduce this difference, internal exposure scenarios for nuclear facilities were developed, and intercomparison were made to determine the harmonization of dose assessment results among the assessors.
{"title":"Verification of Harmonization of Dose Assessment Results According to Internal Exposure Scenarios","authors":"Bong-Gi Kim, Wi-Ho Ha, Tae-Eun Kwon, Jun-Ho Lee, Kyu-Hwan Jung","doi":"10.14407/JRPR.2018.43.4.143","DOIUrl":"https://doi.org/10.14407/JRPR.2018.43.4.143","url":null,"abstract":"Background: The determination of the amount of radionuclides and internal dose for the worker who may have intake of radionuclides results in a variation due to uncertainty of measurement data and ingestion information. As a result of this, it is possible that for the same internal exposure scenario assessors could make considerably different estimation of internal dose. In order to reduce this difference, internal exposure scenarios for nuclear facilities were developed, and intercomparison were made to determine the harmonization of dose assessment results among the assessors.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80820531","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 : 2018-12-30DOI: 10.14407/JRPR.2018.43.4.154
Jaeyeong Jang, T. Schaarschmidt, Yong Kyun Kim
This work was supported by the Korea Institute of EnergyTechnology Evaluation and Planning (KETEP) grant fundedby the Korea government (MOTIE) (20181510102340, Development of a real-time detection system for unidentified RCSleakage less than 0.5 gpm).
{"title":"Feasibility Study of Beta Detector for Small Leak Detection inside the Reactor Containment","authors":"Jaeyeong Jang, T. Schaarschmidt, Yong Kyun Kim","doi":"10.14407/JRPR.2018.43.4.154","DOIUrl":"https://doi.org/10.14407/JRPR.2018.43.4.154","url":null,"abstract":"This work was supported by the Korea Institute of EnergyTechnology Evaluation and Planning (KETEP) grant fundedby the Korea government (MOTIE) (20181510102340, Development of a real-time detection system for unidentified RCSleakage less than 0.5 gpm).","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85859910","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 : 2018-12-30DOI: 10.14407/JRPR.2018.43.4.131
C. Ban, Chul-Yong Lee, B. Jun
Background: We investigated the current characteristics of a thin-film Ag electrode on a chemical vapor deposition (CVD) diamond. The CVD diamond is widely recognized as a radiation detection material because of its high tolerance against high radiation, stable response to various dose rates, and good sensitivity. Additionally, thin-film Ag has been widely used as an electrode with high electrical conductivity.
{"title":"Influence of the Thin-Film Ag Electrode Deposition Thickness on the Current Characteristics of a CVD Diamond Radiation Detector","authors":"C. Ban, Chul-Yong Lee, B. Jun","doi":"10.14407/JRPR.2018.43.4.131","DOIUrl":"https://doi.org/10.14407/JRPR.2018.43.4.131","url":null,"abstract":"Background: We investigated the current characteristics of a thin-film Ag electrode on a chemical vapor deposition (CVD) diamond. The CVD diamond is widely recognized as a radiation detection material because of its high tolerance against high radiation, stable response to various dose rates, and good sensitivity. Additionally, thin-film Ag has been widely used as an electrode with high electrical conductivity.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87551181","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 : 2018-09-30DOI: 10.14407/JRPR.2018.43.3.124
W. Hwang, Joeun Lee, Dahye Kwon, Eun Han Kim, Moon-Hee Han
Results and Discussion: The relative ratios of the re-evaluated ECLs to the currently applied domestic standards differed depending on the radionuclide type, but it was clearly shown that, for tritium (3H) and radiocarbon (14C), which significantly affect radiological dose to the public during the normal operation of nuclear power plants, the re-evaluated ECLs were higher than the domestic standards. This implies that Korean standards are relatively conservative.
{"title":"Re-evaluation of Korean Effluent Concentration Limits and Comparative Analysis","authors":"W. Hwang, Joeun Lee, Dahye Kwon, Eun Han Kim, Moon-Hee Han","doi":"10.14407/JRPR.2018.43.3.124","DOIUrl":"https://doi.org/10.14407/JRPR.2018.43.3.124","url":null,"abstract":"Results and Discussion: The relative ratios of the re-evaluated ECLs to the currently applied domestic standards differed depending on the radionuclide type, but it was clearly shown that, for tritium (3H) and radiocarbon (14C), which significantly affect radiological dose to the public during the normal operation of nuclear power plants, the re-evaluated ECLs were higher than the domestic standards. This implies that Korean standards are relatively conservative.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86500225","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 : 2018-09-30DOI: 10.14407/JRPR.2018.43.3.97
Jeonghee Lee, Ikhyun Kim, Jong-won Park, Yong-Kon Lim, M. Moon, Sang-hyun Lee, C. Lim
Background: A cargo container scanner using a high-energy X-ray generates a fan beam X-ray to acquire a transmitted image. Because the generated X-rays by LINAC may affect the image quality and radiation protection of the system, it is necessary to acquire accurate information about the generated X-ray beam distribution. In this paper, a diode-based multi-channel spatial dose measuring device for measuring the X-ray dose distribution developed for measuring the high energy X-ray beam distribution of the container scanner is described.
{"title":"Development of Diode Based High Energy X-ray Spatial Dose Distribution Measuring Device","authors":"Jeonghee Lee, Ikhyun Kim, Jong-won Park, Yong-Kon Lim, M. Moon, Sang-hyun Lee, C. Lim","doi":"10.14407/JRPR.2018.43.3.97","DOIUrl":"https://doi.org/10.14407/JRPR.2018.43.3.97","url":null,"abstract":"Background: A cargo container scanner using a high-energy X-ray generates a fan beam X-ray to acquire a transmitted image. Because the generated X-rays by LINAC may affect the image quality and radiation protection of the system, it is necessary to acquire accurate information about the generated X-ray beam distribution. In this paper, a diode-based multi-channel spatial dose measuring device for measuring the X-ray dose distribution developed for measuring the high energy X-ray beam distribution of the container scanner is described.","PeriodicalId":36088,"journal":{"name":"Journal of Radiation Protection and Research","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74061010","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}
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