Plutonium Content of Soil at Nagasaki
Plutonium Content of Soil at Nagasaki
复制标题
长崎土壤的钚含量
作者：
M. Sakanoue;Taeko Tsuji
1945年8月9日11时00分，一枚钚原子弹在日本长崎市上空爆炸。炸弹在图1所示地点上方约500米的高度被引爆，风向为西风。1969年7月，从地表较少受干扰的地方(如墓地或草地)采集了表层土壤样本(每10厘米深)，以便确定24年后土壤中剩余的钚的数量。取样地点如图1所示；三种不同的样品(N1、N2、N3)取自西山地区，该地区在爆炸后检测到由于裂变产物而产生的高放射性。1945年秋季空气中的放射性剂量率等高线如图2所示。
THE explosion of a plutonium atomic bomb over Nagasaki city in Japan took place at 1100 h on August 9, 1945. The bomb was detonated at a height of about 500 m above the place indicated in Fig. 1; the direction of the wind was from the west. In July 1969, samples of surface soils (each 10 cm deep) were taken from the less disturbed surface of the ground, such as graveyards or grassland, so that the amount of plutonium remaining in the soil after 24 yr could be determined. The sampling locations are shown in Fig. 1; three different samples (N1, N2, N3) were taken from Nishiyama area where high radioactivities due to fission products had been detected after the explosion The contour of the radioactivity dose rate in air in the autumn of 1945 is shown in Fig. 2.