一种用于全身计数器刻度的简化体模研制

Development of a simplified phantom for calibration of whole-body counter

目的研制一种用于全身计数器刻度的简化体模;方法根据全身计数器刻度的过程与方法,建立了一种用于全身计数器刻度的简化体模设计方法,并利用蒙卡程序设计了一个包含全身、甲状腺、肺部和胃肠道4个器官的简化体模用于ORTEC-Stand FAST II全身计数器的刻度,通过实验测量对该简化体模与BOMAB模型进行测量比较。结果在50 keV到2 MeV范围内,全身计数器对简化体模与BOMAB体模相同器官内相同能量射线探测效率的模拟数据的误差在5%以内,实验测量结果的误差在10%以内。结论本工作研制了一款用于全身计数器刻度的简化体模,验证了用简化体模替代物理人体模型对全身计数器进行刻度的可行性,可为内照射监测中全身计数器的刻度提供极大的便利。

Objective To develop a simplified phantom for the calibration of whole-body counters.Methods A simplified phantom design method for the calibration of whole-body counters was established based on the process and method of calibrating whole-body counters.By using the established method and Monte Carlo method,a simplified phantom including the total body,thyroid,lungs,and gastrointestinal tract was designed to calibrate the ORTEC-Stand FAST II whole-body counter.The simplified phantom was compared with the BOMAB phantom through experimental measurements.Results Within the range of 50 keV to 2 MeV,for rays of the same energy in the same organ of the simplified phantom and BOMAB phantom,the simulated data of detection efficiency by whole-body counting showed an error within 5%,and the experimental measurements showed an error within 10%.Conclusion We developed a simplified phantom for the calibration of the whole-body counter,demonstrating the feasibility of using the simplified phantom instead of a physical body phantom for whole-body counter calibration,which can greatly facilitate whole-body counter calibration for internal radiation monitoring.