Efficiency analysis for in-situ beta measurement system in groundwater

Monitoring of site groundwater is required before and after decommissioning of nuclear facilities. In-situ measurement techniques for beta radioactive contamination such as 3H during decommissioning site are required. Design of detecting system that directly contacts the radiation source with the scintillator for detecting short range beta ray is shown in Fig. 1. A plastic scintillator could be used in an in-situ system as its efficiency was adequate to meet the task, for applications to monitor major beta-emitting nuclides at a decommissioning site. Further research is needed relating to the efficiency of the detection system, focusing more on radionuclides that emit weak beta particles