目的:评价单光子发射计算机断层显像(SPECT)检查过程中患者和照顾者的受照剂量及患者附近的周围剂量当量率,探讨SPECT检查过程中加强辐射防护的重要性。方法:采用In Light型光激发光(OSL)剂量计测量SPECT患者注射药物99Tcm后3 d内照顾...目的:评价单光子发射计算机断层显像(SPECT)检查过程中患者和照顾者的受照剂量及患者附近的周围剂量当量率,探讨SPECT检查过程中加强辐射防护的重要性。方法:采用In Light型光激发光(OSL)剂量计测量SPECT患者注射药物99Tcm后3 d内照顾者的个人剂量当量Hp(10),用γ剂量率仪测量SPECT患者注射药物99Tcm后距患者不同距离及不同方向的周围剂量当量率H·*(10)。结果:SPECT患者佩戴的个人剂量当量Hp(10)在0.45~1.12 m Sv之间,照顾者个人剂量当量Hp(10)在0.09~0.22 m Sv之间。注射放射性药物99Tcm后患者体表周围剂量当量率较高,一定距离处的剂量率显著下降,注射后5.5 h的周围剂量当量率降至注射后即刻测量结果的15%~25%。结论:在SPECT检查过程中,患者注射放射性药物99Tcm后其周围辐射水平较高,应加强防护及管理,提高专业工作人员的防护意识。展开更多
The paper presents a computer code system 'SRDAAR- QNPP' for the real-time dose as-sessment of an accident release for Qinshan Nuclear Power Plant. It includes three parts:thereal-time data acquisition system,...The paper presents a computer code system 'SRDAAR- QNPP' for the real-time dose as-sessment of an accident release for Qinshan Nuclear Power Plant. It includes three parts:thereal-time data acquisition system, assessment computer. and the assessment operating code system. InSRDAAR-QNPP, the wind field of the surface and the lower levels are determined hourly by using amass consistent three-dimension diasnosis model with the topographic following coordinate system.A Lagrangin Puff model under changing meteorological condition is adopted for atmosphericdispersion, the correction for dry and wet depositions. physical decay and partial plume penetrationof the top inversion and the deviation of plume axis caused by complex terrain have been taken in-to account. The calculation domain areas include three square grid areas with the sideline 10 km, 40krn and 160 km and a grid interval 0.5 km, 2.0 km, 8.0 km respectively. Three exposure pathwaysare taken into account:the external exposure from immersion cloud and passing puff, the internalexposure from inhalation and the external exposure from contaminated ground. This system is ableto provide the results of concentration and dose distributions within 10 minutes after the data havebeen inputed.展开更多
Monte Carlo simulations are frequently utilized in radiation dose assessments.However,many researchers find the prevailing computing platforms to be intricate.This highlights a pressing need for a specialized framewor...Monte Carlo simulations are frequently utilized in radiation dose assessments.However,many researchers find the prevailing computing platforms to be intricate.This highlights a pressing need for a specialized framework for phantom dose evalua-tion.To address this gap,we developed a user-friendly radiation dose assessment platform using the Monte Carlo toolkit,Geant4.The Tsinghua University Phantom Dose(THUDosePD)augments the flexibility of Monte Carlo simulations in dosi-metric research.Originating from THUDose,a code with generic,functional,and application layers,THUDosePD focuses predominantly on anatomical phantom dose assessment.Additionally,it enables medical exposure simulation,intricate geometry creation,and supports both three-dimensional radiation dose analysis and phantom format transformations.The system operates on a multi-threaded parallel CPU architecture,with some modules enhanced for GPU parallel computing.Benchmark tests on the ICRP reference male illustrated the capabilities of THUDosePD in phantom dose assessment,covering the effective dose,three-dimensional dose distribution,and three-dimensional organ dose.We also conducted a voxelization conversion on the polygon mesh phantom,demonstrating the method’s efficiency and consistency.Extended applications based on THUDosePD further underline its broad adaptability.This intuitive,three-dimensional platform stands out as a valuable tool for phantom radiation dosimetry research.展开更多
文摘目的:评价单光子发射计算机断层显像(SPECT)检查过程中患者和照顾者的受照剂量及患者附近的周围剂量当量率,探讨SPECT检查过程中加强辐射防护的重要性。方法:采用In Light型光激发光(OSL)剂量计测量SPECT患者注射药物99Tcm后3 d内照顾者的个人剂量当量Hp(10),用γ剂量率仪测量SPECT患者注射药物99Tcm后距患者不同距离及不同方向的周围剂量当量率H·*(10)。结果:SPECT患者佩戴的个人剂量当量Hp(10)在0.45~1.12 m Sv之间,照顾者个人剂量当量Hp(10)在0.09~0.22 m Sv之间。注射放射性药物99Tcm后患者体表周围剂量当量率较高,一定距离处的剂量率显著下降,注射后5.5 h的周围剂量当量率降至注射后即刻测量结果的15%~25%。结论:在SPECT检查过程中,患者注射放射性药物99Tcm后其周围辐射水平较高,应加强防护及管理,提高专业工作人员的防护意识。
文摘The paper presents a computer code system 'SRDAAR- QNPP' for the real-time dose as-sessment of an accident release for Qinshan Nuclear Power Plant. It includes three parts:thereal-time data acquisition system, assessment computer. and the assessment operating code system. InSRDAAR-QNPP, the wind field of the surface and the lower levels are determined hourly by using amass consistent three-dimension diasnosis model with the topographic following coordinate system.A Lagrangin Puff model under changing meteorological condition is adopted for atmosphericdispersion, the correction for dry and wet depositions. physical decay and partial plume penetrationof the top inversion and the deviation of plume axis caused by complex terrain have been taken in-to account. The calculation domain areas include three square grid areas with the sideline 10 km, 40krn and 160 km and a grid interval 0.5 km, 2.0 km, 8.0 km respectively. Three exposure pathwaysare taken into account:the external exposure from immersion cloud and passing puff, the internalexposure from inhalation and the external exposure from contaminated ground. This system is ableto provide the results of concentration and dose distributions within 10 minutes after the data havebeen inputed.
基金This work was supported by the National Natural Science Foundation of China(General Program)(Nos.12175114,U2167209)the Foundation of Key Laboratory of Metrology and Calibration Technology(No.JLKG2022001C001)+2 种基金the Platform Development foundation of China Institute for Radiation Protection(No.YP21030101)the National Key R&D Program of China(No.2021YFF0603600)the Tsinghua University Initiative Scientific Research Program(No.20211080081).
文摘Monte Carlo simulations are frequently utilized in radiation dose assessments.However,many researchers find the prevailing computing platforms to be intricate.This highlights a pressing need for a specialized framework for phantom dose evalua-tion.To address this gap,we developed a user-friendly radiation dose assessment platform using the Monte Carlo toolkit,Geant4.The Tsinghua University Phantom Dose(THUDosePD)augments the flexibility of Monte Carlo simulations in dosi-metric research.Originating from THUDose,a code with generic,functional,and application layers,THUDosePD focuses predominantly on anatomical phantom dose assessment.Additionally,it enables medical exposure simulation,intricate geometry creation,and supports both three-dimensional radiation dose analysis and phantom format transformations.The system operates on a multi-threaded parallel CPU architecture,with some modules enhanced for GPU parallel computing.Benchmark tests on the ICRP reference male illustrated the capabilities of THUDosePD in phantom dose assessment,covering the effective dose,three-dimensional dose distribution,and three-dimensional organ dose.We also conducted a voxelization conversion on the polygon mesh phantom,demonstrating the method’s efficiency and consistency.Extended applications based on THUDosePD further underline its broad adaptability.This intuitive,three-dimensional platform stands out as a valuable tool for phantom radiation dosimetry research.
