Nagatomo T, Hoshi M, Ichikawa Y
Depatment of Physics, Nara University of Education, Japan.
Health Phys. 1995 Oct;69(4):556-9. doi: 10.1097/00004032-199510000-00017.
Gamma-ray kermas from the Hiroshima atomic bomb were measured by a thermoluminescence (TL) method using tile specimens collected from five locations on the rooftop of a building (Postal Saving Bureau), 1,591-1,635 m from the hypocenter. Four tile specimens each from five locations were sampled and quartz grains were extracted from them. TL of these grains were analyzed by the high temperature TL method and gamma-ray kermas were obtained. The results in tissue kerma, on average, are 21% higher (standard errors are 4.3-7.3%) than the DS86 estimation. The present data and the reported TL results indicate that the measured gamma-ray kermas begin to exceed the DS86 values at about 1.3 km and the discrepancy between them increases with ground distance. This discrepancy is attributed to errors in the DS86 neutron source spectrum and is supported by previous neutron activation measurements.
利用热释光（TL）方法，对从距广岛原子弹爆炸震源1591 - 1635米处的一栋建筑（邮政储蓄局）屋顶五个位置采集的瓦片样本进行测量，从而得出伽马射线比释动能。从五个位置各采集四个瓦片样本，并从中提取石英颗粒。通过高温热释光方法分析这些颗粒的热释光，进而获得伽马射线比释动能。组织比释动能的结果平均比DS86估算值高21%（标准误差为4.3 - 7.3%）。目前的数据和已报道的热释光结果表明，在大约1.3千米处，测量得到的伽马射线比释动能开始超过DS86值，并且二者之间的差异随地面距离的增加而增大。这种差异归因于DS86中子源谱中的误差，并且得到了先前中子活化测量结果的支持。
