利用薄板塑闪测量水中总β放射性  

Gross Beta Radioactivity Rapid Monitoring in Water

作　　者：王曦[1] 曾志[1] 龙斌[1] 马豪[1] 苏健[1] 李君利[1] 程建平[1] 

机构地区：[1]清华大学工程物理系粒子技术与辐射成像教育部重点实验室,北京100084

出　　处：《核电子学与探测技术》2014年第1期107-109,共3页Nuclear Electronics & Detection Technology

基　　金：科技部科技基础性工作专项(2012FY130200);清华大学自主科研项目(2011080965);国家863计划(2012AA050907)

摘　　要：在一些特定的情况下,需要一种能快速监测水中放射性活度变化的方法和装置。当前水中总β放射性测量主要采用取样测量的方法,取样测量的结果精确却耗时,这就需要采用新的仪器和设备对水中的放射性进行就地测量。研制了一套基于塑料闪烁体的水中放射性在线监测装置,对该装置的性能进行了模拟计算和初步测试。模拟计算结果表明,装置对40K探测效率为4.9×10-5cps/[(Bq/L)cm2]。通过实际测量,本装置对40K探测效率为3.0×10-5cps/[(Bq/L)cm2],模拟结果与实测结果的差异可能是闪烁光在传输过程中的损失造成的。对该装置进行测试,装置对水中的40K的最小可探测活度浓度约为500 Bq/L。A method for monitoring of radioactivity in water rapidly is needed in certain cases .At present , sam-pling measurement was widely used in gross βradioactivity measurements in water .The result was precise but time-consuming .It needs to adopt the new instruments and equipment for in situ -measurement of the radio-activity in the water .We developed a device to monitoring radioactive in water , which is based on plastic scin-tillator , the performance of this device was simulated and preliminary test is made .The simulation results show that the device detection efficiency for 40K is 4.9 ×10 -5cps/[（Bq/L）cm2].By actual measurement, the de-vice detection efficiency for 40K is 3.0 ×10 -5cps/[（Bq/L）cm2].The difference between simulation results and measured results may be due to the light loss in the process of transmission .Testing the device , the device for a minimum detectable activity concentration is about 500 Bq/L in water .

关 键 词：总Β放射性 MCNP模拟 40K 快速监测 

分 类 号：X837[环境科学与工程—环境工程]