Zheng Jian, Zhang Yongsan, Yamada Masatoshi, Wu Fengchang, Igarashi Yasuhito, Hirose Katsumi
Environmental Radiation Effects Research Group, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan.
Radiat Prot Dosimetry. 2011 Jul;146(1-3):307-10. doi: 10.1093/rpd/ncr177. Epub 2011 Apr 14.
This paper reports on the characterisation of activities of Pu and (241)Am, and Pu isotopic composition in a reference fallout material prepared by the Meteorological Research Institute (MRI), Japan, from samples collected at 14 stations throughout Japan in 1963-1979. The acid leaching and total digestion were used to compare whether there is difference in Pu and (241)Am activities and Pu isotopic composition between these two methods. The results of activities of (239+240)Pu and (241)Pu, and Pu isotopic composition have been reported in the previous work (Sci. Total Environ. 2010, 408, 1139-1144). In this study, the (241)Am activity and (241)Am/(239+240)Pu activity ratio in the reference fallout material are reported, and the usefulness of Pu atom ratios and (241)Am/(239+240)Pu activity ratio for source identification is discussed.
本文报道了对日本气象研究所（MRI）制备的一种参考沉降物材料中钚（Pu）和镅-241（²⁴¹Am）的活度以及钚同位素组成的表征，该材料取自1963年至1979年期间在日本全国14个站点采集的样本。采用酸浸出法和全消化法来比较这两种方法在钚和镅-241活度以及钚同位素组成方面是否存在差异。（²³⁹ + ²⁴⁰）Pu和²⁴¹Pu的活度结果以及钚同位素组成已在先前的工作中报道过（《科学的总环境》，2010年，408卷，1139 - 1144页）。在本研究中，报道了参考沉降物材料中的镅-241活度以及镅-241/（²³⁹ + ²⁴⁰）Pu活度比，并讨论了钚原子比和镅-241/（²³⁹ + ²⁴⁰）Pu活度比在源识别中的实用性。
