探测器置入介质后对辐射场的扰动

DISTURBANCE OF RADIATION FIELD DUE TO THE INTRODUCTION OF DETECTORS INTO A MEDIUM

利用辐射输运方程证明,探测器置入介质后对介质中辐射场扰动可严格地表述为,存在于探测器所占据空间的一个等效辐射源对辐射场的影响。此结论提供了精确估计辐射场扰动修正系数的可能性。讨论了探测器为无限高狭缝以及小球形空腔探测器条件下辐射场扰动修正系数的计算方法。

Using the transport equation of radiation, the disturbance of radia-tion field due to the introduction of a detector into a medium can be precisely expre-ssed as the influence of an equivalent radiation source in the region, where the detec-tor exists, on the radiation field. This result makes it possible to precisely estimatethe correct coefficient of the disturbad radiation field.On this basis. the disturbanceof the radiation fields in the cases of an infinitely high rectangular cavity and a smallspherical detector is evaluated.