Lee J H, Kim I J, Choi H D
Nuclear Policy Research Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Republic of Korea.
Appl Radiat Isot. 2009 Jun;67(6):1094-8. doi: 10.1016/j.apradiso.2009.01.074. Epub 2009 Feb 23.
Characteristics of the dead time of a Geiger-Müller (GM) counter was studied by using a decaying source method and tests were performed for two-parameter dead time models including the general models. Activated (56)Mn was used as the decaying source and the counting rates were observed in one minute steps for 20 half-lives using a GM probe and a multichannel scaler. Measured data were compared with predictions of a generalized dead time model, a dead time model of nonextending-extending (NE-E) types, and a model of extending-nonextending (E-NE) types in series. The NE-E series model described the measured counting rates better than the other models. The model rates were consistent with the data within 10% up to a true rate of approximately 10 kcps, however, its application in the region of higher counting rates was limited. Possible causes of this limitation are discussed. For practical purposes, a phenomenological model is suggested to describe measured counting rates above approximately 10 kcps.
采用衰变源法研究了盖革-米勒（GM）计数器死时间的特性，并对包括通用模型在内的两参数死时间模型进行了测试。使用活化的（56）Mn作为衰变源，使用GM探头和多道分析器以一分钟为步长观察计数率，共观察20个半衰期。将测量数据与广义死时间模型、非扩展-扩展（NE-E）型死时间模型以及串联的扩展-非扩展（E-NE）型模型的预测结果进行了比较。NE-E系列模型比其他模型能更好地描述测量的计数率。在真实计数率约为10 kcps以下时，模型速率与数据的一致性在10%以内，然而，其在更高计数率区域的应用受到限制。讨论了这种限制的可能原因。出于实际目的，建议使用一个唯象模型来描述大约10 kcps以上的测量计数率。
