中国西北地区环境中<sup>239+240</sup>Pu的来源与成因分析

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Abstract This study was taken ^239+240Pu as an example, the five major trends of environmental investigation after the global atmospheric nuclear weapon tests were summarized. Meanwhile, the ^239+240Pu activities, ²⁴⁰Pu/²³⁹Pu atom ratios and ^239+240Pu inventories in the environment of Northwest China were comprehensively analyzed.The results showed that ²⁴⁰Pu/²³⁹Pu atom ratios in soils from Xinjiang, Gansu, Qinghai, Ningxia and Shaanxi were mainly derived from global fallout. Although the former Soviet Union Semipalatinsk nuclear tests, China Lop Nor nuclear tests and Qinghai Atomic City nuclear testing activities may produce the relatively low ²⁴⁰Pu/²³⁹Pu atom ratio, the area of influence was limited.This study not only found the significant change of ²⁴⁰Pu/²³⁹Pu atom ratios in soils, but also found it in lake sediments.Two vertical distribution patterns of catastrophes and gradients on ²⁴⁰Pu/²³⁹Pu atom ratios were found in lake sediment cores in Northwest China. In addition, the location of^239+240Pu activity in some sediment core could not indicated the 1963peak age of global fallout.

Key words： ²⁴⁰Pu/²³⁹Pu ^239+240Pu Northwest China sediment soil

Received: 18 March 2021

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	HUANG Ya-nan
	WU Meng-meng
	XIAO Zhi

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HUANG Ya-nan,WU Meng-meng,XIAO Zhi. Source of ^239+240Pu in the environment of Northwest China and its causes[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5334-5344.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I11/5334

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