中文摘要：

用基于蒙特卡洛法（Monte Carlo Method，MCM）的DRESOR法（Distributions of Ratios of Energy Scattered by the medium Or Reflected by the boundary surface）求解入射辐射经过介质散射、壁面反射传递后辐射强度随时间变化的瞬态辐射传递方程（Transient RadiativeTransfer Equation，TRTE）问题。通过在系统内计算-单位瞬态入射辐射对介质的DRESOR数分布，就能计算任意时间内入射辐射在系统内时间响应特性，这样有效提高数值方法处理瞬态辐射问题的通用性。并且能够获得高方向分辨率的辐射强度随时间变化的结果，这是目前大多数数值处理方法比较难做到的，显示出了DRESOR法处理瞬态入射辐射问题的能力。

英文摘要：

A time-dependent DRESOR（Distributions of Ratios of Energy Scattered by the medium Or Reflected by the boundary surface）method based on the Monte Carlo method （MCM） is developed to solve transient radiative transfer equation within an absorbing, non-emitting and isotropic scattering medium with the reflection of the boundary. By calculating the time-dependent DRESOR values for a unit short-pulse radiation incident into a scattering media, the response characteristics of incident radiation at any time can be calculated, which shows a good versatility of the method. And radiation intensity with high directional resolution could be obtained for any incident radiation composed with a function of the unit incident pulse, which can not be easily done by most current methods. It testified the capability of the DRESOR method for the solution of the transient radiative transfer problem.