Sodium iodide(NaI)detector has wide applications in Prompt Gamma-ray Neutron Activation Analysis(PGNAA)due to its excellent detection efficiency and relatively low cost.In order to obtain the response of the detector to gamma-rays during PGNAA measurement process,a Monte Carlo model was established for the NaI detector to simulate the transport processes of neutrons and gamma-rays.Measurements and analyses were conducted on standard point sources of 60Co,137Cs,152Eu,133Ba,and 241Am,as well as a waterborne source of 137Cs.These measurements were compared with MCNP simulation calculations,and the results demonstrated agreement between the two methodologies.Then,measurements were conducted on aqueous solutions using a D-D neutron generator,and the 2.223 MeV characteristic gamma-ray produced by the H element radiative capture reaction was analyzed.The research results show that the deviations between MCNP simulation calculations of characteristic peaks for the H element and experimental measurements were consistently within 13%,demonstrating that the NaI measurement system model established by MCNP can simulate the transport processes of gamma and neutrons,laying a foundation for the subsequent optimization of the system and other related work.
关键词
NaI探测器/MCNP模拟/瞬发γ射线能谱/中子输运
Key words
NaI detector/MCNP simulation/prompt gamma-ray spectrum/neutron transport
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