Y. Kye, Hyojin Kim, Ji-Eun Lee, Yun-Jae Seo, Jung-Ki Kim, W. Jo, Dong-yeon Lee, Y. Kang
To analyze the biological effects of radiation, it is important that the conditions of in vitro experiments match closely with those of in vivo experiments. In this study, we constructed an irradiation system to conduct irradiation experiments under conditions similar to those of in vivo experiments. The Dongnam Institute of Radiological and Medial Sciences has a gamma irradiator including 60Co radioisotope for research purposes and accreditation for standard calibration of the ion chamber. The temperature of the water phantom was maintained the same as that of the normal human body, and the physical dosimetry was carried out accurately using the ion chamber with traceability. We report the measurement of lateral profiles, depth profiles, and absorbed dose rate in water, Dw, at the irradiation location of the blood samples using a farmer-type ion chamber. We simulated the source, collimator, irradiator, phantom, and extra structure of the gamma irradiation system using the Monte Carlo code and compared the simulated and the experimental results. The experimentally and theoretically evaluated dose rates were 0.2975 ? 0.0055 Gymin?1 (at coverage factor k = 2) and 0.2978 ? 0.0052 Gymin?1 (at coverage factor k = 2) at source-to-surface distance of 100 cm and 5 gcm?2 depth in the water phantom, respectively. Blood irradiation will be conducted in vitro, under conditions similar to in vivo conditions, to provide the dose-response curve based on dosimetry with traceability.
{"title":"Measurement of absorbed dose rate in water phantom maintained at body temperature by 60Co irradiator – comparison of experimental results and Monte Carlo simulation","authors":"Y. Kye, Hyojin Kim, Ji-Eun Lee, Yun-Jae Seo, Jung-Ki Kim, W. Jo, Dong-yeon Lee, Y. Kang","doi":"10.2298/ntrp2103289k","DOIUrl":"https://doi.org/10.2298/ntrp2103289k","url":null,"abstract":"To analyze the biological effects of radiation, it is important that the conditions of in vitro experiments match closely with those of in vivo experiments. In this study, we constructed an irradiation system to conduct irradiation experiments under conditions similar to those of in vivo experiments. The Dongnam Institute of Radiological and Medial Sciences has a gamma irradiator including 60Co radioisotope for research purposes and accreditation for standard calibration of the ion chamber. The temperature of the water phantom was maintained the same as that of the normal human body, and the physical dosimetry was carried out accurately using the ion chamber with traceability. We report the measurement of lateral profiles, depth profiles, and absorbed dose rate in water, Dw, at the irradiation location of the blood samples using a farmer-type ion chamber. We simulated the source, collimator, irradiator, phantom, and extra structure of the gamma irradiation system using the Monte Carlo code and compared the simulated and the experimental results. The experimentally and theoretically evaluated dose rates were 0.2975 ? 0.0055 Gymin?1 (at coverage factor k = 2) and 0.2978 ? 0.0052 Gymin?1 (at coverage factor k = 2) at source-to-surface distance of 100 cm and 5 gcm?2 depth in the water phantom, respectively. Blood irradiation will be conducted in vitro, under conditions similar to in vivo conditions, to provide the dose-response curve based on dosimetry with traceability.","PeriodicalId":49734,"journal":{"name":"Nuclear Technology & Radiation Protection","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68547200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Jumpee, C. Onnomdee, P. Charoenphun, P. Phruksarojanakun, K. Chuamsaamarkkee
Selective internal radiation therapy using an 90Y labelled microsphere is increasingly used to treat hepatocellular carcinoma. Based on its properties, 90Y can produce bremsstrahlung radiation which is essential for post-treatment localisation and dosimetry. However, bremsstrahlung radiation could lead to an increase of radiation exposure of radiation workers. The aim of this work was to determine the 90Y bremsstrahlung radiation produced from the polymethyl methacrylate radiation shielding apparatus using the Monte Carlo simulation. A scintillation detector with a 137Cs standard source was used to validate the Monte Carlo simulation. After validation, the 90Y bremsstrahlung photons spectrum produced from the radiation shielding apparatus was simulated. The radiation equivalent dose rates to the head, neck, body, lower extremities at a distance of 30 centimeters, and finger (contact with the knob) were estimated to be 4.9 ? 0.6, 6.2 ? 0.1, 18.9 ? 0.4, 13.1 ? 0.6, and 3900 ? 50 ?Svh?1, respectively. The corresponding annual doses exceeded the limit when radiation workers performed 2631, 1563, 769, and 515 cases per year with contact the knob 3, 5, 10, and 15 minutes per case, respectively. The simulation result showed that radiation exposure of radiation workers and the number of selective internal radiation therapy procedures performed should be considered.
{"title":"Radiation safety aspects of 90Y bremsstrahlung radiation produced from radiation shielding apparatus using the Monte Carlo simulation","authors":"C. Jumpee, C. Onnomdee, P. Charoenphun, P. Phruksarojanakun, K. Chuamsaamarkkee","doi":"10.2298/ntrp2103255j","DOIUrl":"https://doi.org/10.2298/ntrp2103255j","url":null,"abstract":"Selective internal radiation therapy using an 90Y labelled microsphere is increasingly used to treat hepatocellular carcinoma. Based on its properties, 90Y can produce bremsstrahlung radiation which is essential for post-treatment localisation and dosimetry. However, bremsstrahlung radiation could lead to an increase of radiation exposure of radiation workers. The aim of this work was to determine the 90Y bremsstrahlung radiation produced from the polymethyl methacrylate radiation shielding apparatus using the Monte Carlo simulation. A scintillation detector with a 137Cs standard source was used to validate the Monte Carlo simulation. After validation, the 90Y bremsstrahlung photons spectrum produced from the radiation shielding apparatus was simulated. The radiation equivalent dose rates to the head, neck, body, lower extremities at a distance of 30 centimeters, and finger (contact with the knob) were estimated to be 4.9 ? 0.6, 6.2 ? 0.1, 18.9 ? 0.4, 13.1 ? 0.6, and 3900 ? 50 ?Svh?1, respectively. The corresponding annual doses exceeded the limit when radiation workers performed 2631, 1563, 769, and 515 cases per year with contact the knob 3, 5, 10, and 15 minutes per case, respectively. The simulation result showed that radiation exposure of radiation workers and the number of selective internal radiation therapy procedures performed should be considered.","PeriodicalId":49734,"journal":{"name":"Nuclear Technology & Radiation Protection","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68546689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Kartalović, Sasa Djekic, Sasa Djekic, Uzahir R. Ramadani, Dušan P. Nikezić
Quantum mechanics consideration, supported by a concrete example, yielded standard sources of direct voltage measured by frequency (which is the most accurate measurable physical quantity) and extremely sensitive instrument for measuring magnetic induction SQUID (which is an acronym based on the term Superconducting Quantum Interference Device). The possibility of these measurements is based on the Josephson junction. In this paper, the influence of gamma radiation on the measurement uncertainty Type A, of a commercial Josephson compound, is investigated. The conclusion is that both dynamic gamma radiation and the dose of gamma radiation, under the conditions of the experiment, have a negligible effect on the measurement uncertainty of the Josephson junction. Based on the obtained result, it was concluded that in the primary metrological conditions, the measurement uncertainty type A of the Josephson junction is negligible, i. e., that the secondary cosmic radiation does not affect the standard of the DC voltage source.
{"title":"Influence of gamma radiation on Josephson junction","authors":"N. Kartalović, Sasa Djekic, Sasa Djekic, Uzahir R. Ramadani, Dušan P. Nikezić","doi":"10.2298/ntrp2104352k","DOIUrl":"https://doi.org/10.2298/ntrp2104352k","url":null,"abstract":"Quantum mechanics consideration, supported by a concrete example, yielded standard sources of direct voltage measured by frequency (which is the most accurate measurable physical quantity) and extremely sensitive instrument for measuring magnetic induction SQUID (which is an acronym based on the term Superconducting Quantum Interference Device). The possibility of these measurements is based on the Josephson junction. In this paper, the influence of gamma radiation on the measurement uncertainty Type A, of a commercial Josephson compound, is investigated. The conclusion is that both dynamic gamma radiation and the dose of gamma radiation, under the conditions of the experiment, have a negligible effect on the measurement uncertainty of the Josephson junction. Based on the obtained result, it was concluded that in the primary metrological conditions, the measurement uncertainty type A of the Josephson junction is negligible, i. e., that the secondary cosmic radiation does not affect the standard of the DC voltage source.","PeriodicalId":49734,"journal":{"name":"Nuclear Technology & Radiation Protection","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68547569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Problems related to metrological assurance of laboratory and continuous petroleum moisture meters and means of verification of the devices, such as state standard samples, dynamic benches, and standard moisture meters are considered. The feasibility of using verification units based on laboratory moisture meters based on the Fisher method is discussed.
{"title":"Measurement","authors":"W. Hallenbeck","doi":"10.1201/9781003070191-7","DOIUrl":"https://doi.org/10.1201/9781003070191-7","url":null,"abstract":"Problems related to metrological assurance of laboratory and continuous petroleum moisture meters and means of verification of the devices, such as state standard samples, dynamic benches, and standard moisture meters are considered. The feasibility of using verification units based on laboratory moisture meters based on the Fisher method is discussed.","PeriodicalId":49734,"journal":{"name":"Nuclear Technology & Radiation Protection","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77297123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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