中国边缘海柱样沉积物中<sup>239+240</sup>Pu的分布与时标价值

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Abstract

According to 77 sedimentary cores of ^239+240Pu in the marginal sea of China, the distribution and time-scale characteristics of ^239+240Pu were analyzed, and 26possible cases of dating with ²¹⁰Pb, ¹³⁷Cs, and ^239+240Pu were given in theory, which were in good agreement with the actual situation. The overlapping of ^239+240Pu sedimentary cores from different sources made the peak profile of ^239+240Pu obvious in the coastal waters (especially in estuaries). From near shore to far sea, the distribution of ^239+240Pu in sedimentary cores may have bimodal distribution (multi-peaks), unimodal distribution and non-peak distribution due to the influence of comprehensive factors such as ^239+240Pu source, seawater depth, Kuroshio current mixing, diffusion effect and boundary clear-up effect. When ^239+240Pu in the sedimentary core present a unimodal distribution, it corresponded to the peak year of global fallout in 1963, and the time scale value was reliable. The reliability of ²¹⁰Pb, ¹³⁷Cs, and ^239+240Pu dating under different marine environment conditions should be analyzed according to the specific marine sedimentary environment because of the difference of sedimentary properties of ¹³⁷Cs and ^239+240Pu.

Key words： marginal sea of China ²¹⁰Pb ¹³⁷Cs ^239+240Pu dating sedimentary core

Received: 01 August 2019

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	HUANG Ya-nan
	PAN Shao-ming

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HUANG Ya-nan,PAN Shao-ming. The dating and distribution of ^239+240Pu in the sediment cores of the marginal sea of China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(3): 1235-1245.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I3/1235

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