title: Monte Carlo simulation of in situ LaBr gamma-ray spectrometer for marine environmental monitoring.
abstract: Monte Carlo simulation of energy-response functions of gamma rays from natural/artificial radionuclides in seawater and simulation of energy spectrum due to self-activity in LaBr crystal were carried out using MCNPX codes and MATLAB programs for the in situ LaBr gamma-ray spectrometer immersed in homogeneous seawater. The effective detection distance, the detection efficiency and the minimum detectable activity concentration (MDAC) for artificial radionuclides (137)Cs were worked out as an instance. Similar researches for NaI detector was also implemented for comparison. The results indicate that the self-activity in LaBr deteriorates the MDAC to merely several times of that of NaI detector. The LaBr detector is possible to be used as in situ gamma-ray spectrometer for monitoring of artificial radionuclides in seawater.
authors: Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
authors: Genghua
authors: G
authors: Su
authors: Zhi
authors: Z
authors: Zeng
authors: Jianping
authors: J
authors: Cheng