To estimate the physical dose of skin and key organs in a case of overexposure during a cardiac interventional procedure.Methods The female patient aged 50 suffered from owerexposure during ardiac interventional thera...To estimate the physical dose of skin and key organs in a case of overexposure during a cardiac interventional procedure.Methods The female patient aged 50 suffered from owerexposure during ardiac interventional therapy in a hospital,Xinxiang city,Henan province,China in January 2020.The mesh-type phantom for the patient was constructed based on the adult mesh-type reference computational phantoms(MRCPs)released by the International Comission on Radiological Protection Publication 145 (ICRP145)and phantom deformation technology.Models of exposure scenario were constructed and simulated with particle and heavy ion transport code system(PHTTS)according to exposure conditions.Resuts:The maximum absorbed dose of key organs/tissues under iradiation in posteroanterior(PA)and 30°left anterior oblique directions(LOA)was 632.4 and 305.6 mGy,respectively.The let lung,heart,and left mammary gland received a larger dose under both iradiation conditions.The ratio of the absorbed dose with and without shielding was a lculated,and the relative difference in most organs was<1%between two directions.The iso-dose curve of the back skin revealed the ditribution of the absorbed dose(0.1-5.2 Gy).The dose estimate of key tssues/organs was higher than the conventional level,especially the local skin,up to 5.2 Gy.Concusions The interventional procedure in this ase resulted in a higher dose.Monte Carlo codes combined with the MRCPs can be employed to estimate physical dose to individuals in concrete irradia tion scenarios.展开更多
Purpose The Astro Bio Cube Sat(ABCS)was successfully deployed in its circular orbit at an altitude of 5850 km in the Van Allen Belt.Besides the primary mission of validating the analytical platform hosted in the paylo...Purpose The Astro Bio Cube Sat(ABCS)was successfully deployed in its circular orbit at an altitude of 5850 km in the Van Allen Belt.Besides the primary mission of validating the analytical platform hosted in the payload in such a harsh radiation environment,we used the telemetry data related to the dosimetry readings transmitted during the active mission period to back-validate the satellite’s radiation transport model,which was already used for the payload shielding design.Methods The radiation transport model was implemented with the high-energy Monte Carlo transport code FLUKA,and the definition of the orbital radiation sources were calculated using the SPENVIS code.In the actual work,the orbital radiation sources were defined at the mission epoch using SPENVIS and IRENE codes.In the FLUKA model,we implemented the dosimeters and further payload components,such as a battery pack and pump,which could furnish further shielding.The simulations executed with this upgraded model estimate the average dose rate measured during the mission period.To quantify the model validity,we compare the simulated dose rate with the one derived by fitting the telemetric integral dose data transmitted during the mission,finding a good agreement.An analysis of uncertainties and some consideration of space weather conditions are also considered to explain the agreement.Conclusion Based on the measured dose rate,the payload shielding was satisfactory.The agreement between the calculated and measured dose rates confirms the adequateness of the Monte Carlo model.Further work will be devoted to applying biasing techniques to speed up the simulation time.展开更多
基金National Natural Science Foundation of China(No.12105200,12175161,U186720)Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions+1 种基金Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD),ChinaNuclear Energy Development Project,China(No.2016-1295).
文摘To estimate the physical dose of skin and key organs in a case of overexposure during a cardiac interventional procedure.Methods The female patient aged 50 suffered from owerexposure during ardiac interventional therapy in a hospital,Xinxiang city,Henan province,China in January 2020.The mesh-type phantom for the patient was constructed based on the adult mesh-type reference computational phantoms(MRCPs)released by the International Comission on Radiological Protection Publication 145 (ICRP145)and phantom deformation technology.Models of exposure scenario were constructed and simulated with particle and heavy ion transport code system(PHTTS)according to exposure conditions.Resuts:The maximum absorbed dose of key organs/tissues under iradiation in posteroanterior(PA)and 30°left anterior oblique directions(LOA)was 632.4 and 305.6 mGy,respectively.The let lung,heart,and left mammary gland received a larger dose under both iradiation conditions.The ratio of the absorbed dose with and without shielding was a lculated,and the relative difference in most organs was<1%between two directions.The iso-dose curve of the back skin revealed the ditribution of the absorbed dose(0.1-5.2 Gy).The dose estimate of key tssues/organs was higher than the conventional level,especially the local skin,up to 5.2 Gy.Concusions The interventional procedure in this ase resulted in a higher dose.Monte Carlo codes combined with the MRCPs can be employed to estimate physical dose to individuals in concrete irradia tion scenarios.
基金supported by ASI/INAF agreement no.2019-30-HH.0。
文摘Purpose The Astro Bio Cube Sat(ABCS)was successfully deployed in its circular orbit at an altitude of 5850 km in the Van Allen Belt.Besides the primary mission of validating the analytical platform hosted in the payload in such a harsh radiation environment,we used the telemetry data related to the dosimetry readings transmitted during the active mission period to back-validate the satellite’s radiation transport model,which was already used for the payload shielding design.Methods The radiation transport model was implemented with the high-energy Monte Carlo transport code FLUKA,and the definition of the orbital radiation sources were calculated using the SPENVIS code.In the actual work,the orbital radiation sources were defined at the mission epoch using SPENVIS and IRENE codes.In the FLUKA model,we implemented the dosimeters and further payload components,such as a battery pack and pump,which could furnish further shielding.The simulations executed with this upgraded model estimate the average dose rate measured during the mission period.To quantify the model validity,we compare the simulated dose rate with the one derived by fitting the telemetric integral dose data transmitted during the mission,finding a good agreement.An analysis of uncertainties and some consideration of space weather conditions are also considered to explain the agreement.Conclusion Based on the measured dose rate,the payload shielding was satisfactory.The agreement between the calculated and measured dose rates confirms the adequateness of the Monte Carlo model.Further work will be devoted to applying biasing techniques to speed up the simulation time.
