点源与探测器相对位置发生变化时,探测效率会发生很大变化,确定探测效率随探测距、角度变化的函数关系有利于快速得到点源在任意位置处的探测效率。利用蒙特卡罗软件MCNP5模拟计算了^(152)Eu、^(137)Cs、^(60)Co点源在特定位置处的探测...点源与探测器相对位置发生变化时,探测效率会发生很大变化,确定探测效率随探测距、角度变化的函数关系有利于快速得到点源在任意位置处的探测效率。利用蒙特卡罗软件MCNP5模拟计算了^(152)Eu、^(137)Cs、^(60)Co点源在特定位置处的探测效率,与实验结果相比,最大误差不超过6%。基于MCNP5对3.81 cm LaBr_(3)(Ce)探测器做效率刻度,并计算了点源在探测器正面2π空间范围内不同位置处的探测效率,拟合了探测效率与角度和距离的函数关系。结果表明:点源探测效率最大值出现在与探测器轴线夹角90°处,随着探测距离和能量的增大,角度对点源探测效率的影响逐渐减小;空间位置对探测效率的影响实际上是对点源相对于探测器的空间立体角效率。基于效率函数可计算出特定能量γ射线在空间任意位置处的探测效率,对LaBr_(3)(Ce)探测器效率矩阵的求解及效率刻度具有一定的参考价值和指导意义。展开更多
Based on the high energy γ-ray yield from the H-bomb D-T fusion reaction, it brings forward the idea applying the 16.76 MeV γ-ray to judge whether the H-bomb happens or not, and to deduce the explosion TNT equivalen...Based on the high energy γ-ray yield from the H-bomb D-T fusion reaction, it brings forward the idea applying the 16.76 MeV γ-ray to judge whether the H-bomb happens or not, and to deduce the explosion TNT equivalent accurately. The Monte Carlo N-Particle was applied to simulate the high energy γ-ray radiation characteristics reaching the geosynchronous orbit satellite, and the CVD diamond detector suit for the requirements was researched. A series of experiments were carried out to testify the capabilities of the diamond detector. It provides a brand-new approach to satellite-based nuclear explosion detection.展开更多
文摘点源与探测器相对位置发生变化时,探测效率会发生很大变化,确定探测效率随探测距、角度变化的函数关系有利于快速得到点源在任意位置处的探测效率。利用蒙特卡罗软件MCNP5模拟计算了^(152)Eu、^(137)Cs、^(60)Co点源在特定位置处的探测效率,与实验结果相比,最大误差不超过6%。基于MCNP5对3.81 cm LaBr_(3)(Ce)探测器做效率刻度,并计算了点源在探测器正面2π空间范围内不同位置处的探测效率,拟合了探测效率与角度和距离的函数关系。结果表明:点源探测效率最大值出现在与探测器轴线夹角90°处,随着探测距离和能量的增大,角度对点源探测效率的影响逐渐减小;空间位置对探测效率的影响实际上是对点源相对于探测器的空间立体角效率。基于效率函数可计算出特定能量γ射线在空间任意位置处的探测效率,对LaBr_(3)(Ce)探测器效率矩阵的求解及效率刻度具有一定的参考价值和指导意义。
文摘Based on the high energy γ-ray yield from the H-bomb D-T fusion reaction, it brings forward the idea applying the 16.76 MeV γ-ray to judge whether the H-bomb happens or not, and to deduce the explosion TNT equivalent accurately. The Monte Carlo N-Particle was applied to simulate the high energy γ-ray radiation characteristics reaching the geosynchronous orbit satellite, and the CVD diamond detector suit for the requirements was researched. A series of experiments were carried out to testify the capabilities of the diamond detector. It provides a brand-new approach to satellite-based nuclear explosion detection.
