摘要
利用蒙特卡罗方法计算了距地面30～100km处的γ射线源,通过大气传输到距地面500km轨道上的不同位置处的γ射线的光子注量、能量注量以及能谱和飞行时间谱的变化情况。计算结果表明:到达较大的轨道倾斜角处的积分光子注量比在真空中传输的积分光子注量超出了30%～90%,能量注量的传输值几乎与真空中的传输值相同。这是由于源附近大气对光子散射到达探测点的注量超过大气对光子的吸收所致。高能注量主要来自非碰撞光子,低能注量来自散射光子。
The paper describes the calculations of photon fluence , energy flux, energy spectrum and the time spectra of the flight arriving at different location at 500km Orbit for gamma rays sources located at 30～100 km above the Earth's surface by the Monte Carlo transport code in its photon transport modes. The authors found that the photon flux of gamma rays is larger 30%～90% than the value in the free-space and the photon energy flux of gamma rays almost equal to the value in the free-space. This is because the scattered photon energy flux from the atmosphere scattering near the source preponderate over the absorption. The high energy part of the photon arriving at the detectors is made up of uncollision photon. The low energy part of the photon arriving the detectors is made up of the scattered photon.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2005年第3期283-286,共4页
Nuclear Electronics & Detection Technology
