Maruyama T, Kumamoto Y, Noda Y
National Institute of Radiological Sciences, Chiba-shi, Japan.
Radiat Res. 1988 Jan;113(1):1-14.
Reassessment of gamma doses from the atomic bombs in Hiroshima and Nagasaki has been carried out with thermoluminescent measurements of ceramic materials, such as bricks and decorative tiles, which were collected from buildings that remain as they were at the time of the explosions. The thermoluminescent measurements were performed using thermoluminescent dating techniques generally used in archaeology. Annual background dose rates from natural radionuclides in the ceramic materials and from environmental radiation including cosmic rays were determined with commercially available thermoluminescent detectors. A time-zero point at the original firing of the ceramic materials was estimated from the age of the buildings given in "the register book." Total background dose was evaluated by multiplying the period between the time-zero point and the time of measurement by the annual dose rate. The resultant gamma doses in Hiroshima and Nagasaki are given as a function of distance from ground zero and are compared with the DS86 (Dosimetry System 1986) and the T65D (Tentative 1965 Dose) gamma doses.
利用热释光测量法对广岛和长崎原子弹爆炸产生的伽马剂量进行了重新评估。测量对象是从爆炸时保持原状的建筑物中收集的砖块和装饰瓷砖等陶瓷材料。热释光测量采用了考古学中常用的热释光测年技术。使用市售热释光探测器测定了陶瓷材料中天然放射性核素以及包括宇宙射线在内的环境辐射的年本底剂量率。根据“登记簿”中给出的建筑物年代估算了陶瓷材料最初烧制时的时间零点。通过将时间零点与测量时间之间的时间段乘以年剂量率来评估总本底剂量。广岛和长崎的最终伽马剂量表示为距爆心投影点距离的函数，并与DS86（1986年剂量测定系统）和T65D（1965年暂定剂量）伽马剂量进行了比较。
