#ACS MASTER FALLOUT 4 SERIES#

In this study, we selected several surface sediments NorthВ ofВ ChinaВ (40В°NвЂ“50В°N)В (surfaceВ soil)ДЄlthough there have been some studies on the transportationДistribution of Pu in China, there is less information on the Pu inД¬hinese river basins. NorthernВ NorthВ YellowВ SeaВ (surfaceВ sediment) PPG and global fallout are mainly the sources of Pu in some river Of global fallout but lower than the value of PPG, indicating that Sediments of river estuaries in China are also higher than the value 11, 12, 24 Even the 240Pu/ 239Pu atom ratios in some surface Of the PPG, which indicates a finite fraction of Pu from PPG intoД¬hinese marginal seas via some ocean currents (the North EquatorialД¬urrent and Kuroshio Current). Marginal seas have found that these values are between the value of Studies on the 240Pu/ 239Pu atom ratios in Chinese The source of Pu in Chinese marginal seas is complicated. Indicated that the Pu might have been derived from Chinese nuclear Pu in a sediment core was collected in Lake Chenghai, and one peak 10 Moreover, a three-peak pattern vertical distribution of The closest lake to the Lop Nor nuclear test site. Was found in a sediment core collected from Lake Bosten, which is 500 km southeast of the Lop Nor test site. 21 A 240Pu/ 239Pu atom ratio of 0.103 was found in sediments from Lake Sugan locatedД¬a. 18в€’ 20 It is well known that 45 nuclear tests had been conductedДЄt the Lop Nor nuclear test site from 1964 to 1996, 23 of which wereДЄtmospheric nuclear tests, which is located in the northwestern part 18 The average atom ratio of 240Pu/ 239Pu is 0.19, indicating that the Pu source in surface soils is mainlyДЇrom global fallout.

Settlement occurring between 40В°N and 50В°N. Soils showed obvious latitude-dependent distribution, with maximum In mainland China, the activity of 239+240Pu in surface In the past few years, many researchers have studied Pu in 16, 17 In addition, the Pu caused by the Fukushima accident (FNA) has the 240Pu/ 239Pu atom ratio of 0.30вЂ“0.38. The Pacific Proving Ground (PPG) in the Marshall Islands has the 240Pu/ 239Pu atom ratio of 0.30вЂ“0.36. Pu from nuclear reactor-grade has the 240Pu/ 239Pu atom ratio of 0.2вЂ“1.0, 14 the 240Pu/ 239Pu atom ratio from global fallout is approximately In detail, the weapons-grade Pu has the 240Pu/ 239Pu atom ratio of 0.01вЂ“0.07, 6 the Provide fingerprints for different sources, 13 and it is considered an excellent indicator for nuclear forensics. 5в€’ 12 For example, the 240Pu/ 239Pu atom ratio can Rebuilding the Pu historical events, migration of Pu in seas and land,ДЄnd special impacts on the environment. Of Pu in nature, including the sources of Pu, Pu inputs, and distribution,

#ACS MASTER FALLOUT 4 SERIES#

Long half-life have been used as tracers to analyze series processes It was estimated that approximately 15вЂЇ000 TBq 239+240Pu was produced by atmospheric nuclear weapon tests, and approximatelyДЎ2вЂЇ500 TBq was globally distributed via the stratosphere. Have high radiological toxicity and long-term retention in the environment. Anthropogenic radionuclides 239Pu ( T 1/2 = 24вЂЇ100 years) Nuclear weapons tests, 1 nuclear power plants,ДЇukushima accident), and nuclear fuel reprocessing, 2, 3 was Only total organic carbon (TOC) content and the heavy metal As hadДЄ positive correlation with the 239+240Pu activity. In this study, we also analyzed some factors that wouldДЄffect the distribution of 239+240Pu activities however, Plants in these river basins and these data could provide some indicationsДЇor dealing with nuclear accidents in different parts of river basins Also, there are several planned and operating nuclear power Not only filled in a knowledge gap of Pu in these river basins butДЄlso served as background data for Pu contamination from a nuclear The Pearl River Basin to Pu inventory was 13 В± 5%. Quantified in the Pearl River Estuary and the Pu contribution from Might be from the global fallout and the Pacific Proving Grounds (PPG)

River basins might be from global fallout, and the Pu in river estuaries According to the 240Pu/ 239Pu atom ratios, the Pu source in the inner Trend from the upstream region to the estuary. Because of river transport function, the distribution of 239+240Pu activities in these river basins presented an increasing River basins were very similar, however, only the 239+240Pu activities in the Jinjiang Basin were generally higher than other We clarified that the 239+240Pu activities in these Southern China were analyzed to investigate the distribution and source The 239+240Pu activities and 240Pu/ 239Pu atom ratios in surface sediments from the major

Acs master fallout 4