A system for low-level the cosmogenic ~(22)Na radionuclide measurement by gamma-gamma coincidence method using BGO detectors

摘要

In this study, a gamma-gamma coincidence spectrometry was developed and examined for environmental low-level cosmogenic ~(22)Na monitoring purposes. The spectrometry consists of two bismuth germanate scintillators (BGO) and XIA LLC Digital Gamma Finder (DGF)/Pixie-4 software and card package. The developed spectrometry was optimized according to the considerations of output count rate and gamma peak energy resolution. This spectrometry provides a more sensitive and effective way to quantify even trace amounts of ~(22)Na with critical detection limit of 9 mBq. A sophisticated computer simulation was also created with the goal of obtaining a better understanding of the experimental results and gamma-gamma coincidence efficiencies at different sample geometries.