海洋放射性现场探测谱仪的机械优化设计

为提高海洋放射性现场探测NaI(Tl)谱仪的探测性能，采用蒙特卡罗仿真和统计计算方法，研究和分析谱仪封装、材料和尺寸等机械设计对探测性能的影响规律。综合考虑伽马射线衰减和密封、耐压及耐腐蚀等要求，开展谱仪的机械优化设计和海上现场检测实验。优化谱仪达到了对40K最小探测活度约0.30 Bq/L，现场测量相对误差为0.45%。该研究对海洋放射性现场探测谱仪的性能优化设计和现场应用具有重要的指导意义。

The mechanical design optimization of a spectrometerfor in situ marine radioactivity monitoring

To improve the detection performance of an NaI (Tl) spectrometer for in situ marine radioactivity monitoring, Monte Carlo simulation and statistical calculation methods were used to study and analyze the effect of mechanical design of spectrometer package, material, and size on detection performance. Considering the requirements of gamma ray attenuation, sealing, pressure resistance, and corrosion resistance, the mechanical optimization design of the spectrometer and on-site detection experiments were conducted. The minimum detectable activity of the optimized spectrometer was approximately 0.30 Bq/L for 40K, and the relative error of measurement was 0.45%. This study has important guiding significance for the performance optimization design and field application of gamma spectrometers for in situ marine radioactivity monitoring.