中国大陆土壤中<sup>239+240</sup>Pu的来源与背景值研究

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Abstract

This study used the large existing database on ¹³⁷Cs reference inventories, according to the radioactivity ratio of ¹³⁷Cs/^239+240Pu (32.5,¹³⁷Cs radioactivity is corrected to 2005) in the Northern Hemisphere, and converted ¹³⁷Cs reference inventories to the corresponding values for ^239+240Pu. The ¹³⁷Cs Reference Inventory Model for Mainland China (¹³⁷Cs-RI MCM) had been used to establish an analogous, by using Kriging/Cokriging interpolation to simulate the spatial distribution of the Pu-RI in the soils across China. At present, the measured deposition inventories for ^239+240Pu range from 7.3 to 546Bq/m² and Pu-RI simulated values range from 3 to 812Bq/m². Maxima in the deposition inventory correlated well with those of the Pu-RI simulation, which suggested the ¹³⁷Cs-RI MCM has potential for the simulation of the Pu-RI in the soils of the mainland of China. In-homogeneity in the atmospheric deposition of ¹³⁷Cs and ^239+240Pu however lead to deviations between the local Pu-RI simulation values and the measured ¹³⁷Cs/^239+240Pu radioactivity ratios present in Chinese soil cores. In order to better illustrate the feasibility of the ¹³⁷Cs-RI MCM, this study compared theoretical wet deposition inventories of ^239+240Pu with the corresponding Pu-RIs in 62 cities of China between latitudes 30~40°N, this showed that the theoretical calculations of Pu-RI or total deposition inventories and wet deposition inventories were reasonable.

Key words： ^239+240Pu source ²⁴⁰Pu/²³⁹Pu Pu-reference inventory soil Mainland China

Received: 08 May 2018

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	Articles by authors
	HUANG Ya-nan
	PAN Shao-ming
	ZHANG Wei
	Stephen G. Tims
	LIU Zhi-yong

Cite this article:

HUANG Ya-nan,PAN Shao-ming,ZHANG Wei等. The source and reference inventory of ^239+240Pu in the soil of China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(12): 4608-4616.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I12/4608

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