过筛粒径大小对HPGeγ谱仪测定~(137)Cs和~(210)Pb的影响

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	过筛粒径大小对HPGeγ谱仪测定~(137)Cs和~(210)Pb的影响
	刘叶涵 1; 李勇 2; 于寒青 1; 耿肖臣 1
刊名	核农学报
	2012
卷号	26 期号:8 页码:1172-1177
关键词	~(137)Cs和~(210)Pb 过筛粒径分析精度土壤样品
ISSN号	1000-8551
其他题名	DETERMINATION OF ~(137)Cs AND ~(210)Pb USING HPGeγ SPECTROMETRY AS INFLUENCED BY DIFFERENT SIEVE DIAMETERS
英文摘要	2.00mm通常被作为实验室测定土壤中环境放射性核素~(137)Cs和~(210)Pb比活度时土壤样品过筛粒径,但有关不同过筛粒径对测量准确性的影响评价鲜有报道。本研究选择了褐土、栗钙土和紫色土等3种代表性土壤,经4种过筛粒径2.00、1.00、0.50和0.25mm处理后,利用HPGeγ谱仪测定了处理土样中的~(137)Cs和~(210)Pb比活度。~(137)Cs测量结果显示,相比2.00mm的粒径,0.25mm粒径能减少样品中~(137)Cs分析精度达到可接受值的时间,同时对比活度测量值具有积极影响;对~(210)Pb而言,过筛粒径的减小会造成分析精度达到可接受值时间的延长,但对比活度的测量值影响并不显著。研究结果在提高利用HPGeγ谱仪准确测定环境样品中的~(137)Cs和~(210)Pb比活度方面具有重要意义。; Standard sieve diameter is often set as 2.00 mm to determine specific activity of ~(137)Cs and ~(210)Pb in soil samples, but it is rarely reported that whether the size of the different screening will affect the accuracy of such determination. In this study, three representative soils were employed to assess the effects of different sieve sizes on measurement of ~(137)Cs and ~(210)Pb activity in soil samples by using HPGeγ spectrometer. The targeted soil samples each were screened through the four sieve diameters 2.00, 1.00, 0.50 and 0.25 mm, respectively. It was observed that the sample of 0.25 mm took less time to reach the acceptable value of ~(137)Cs analysis precision and higher value of the specific activity in the three soils compared to the 2.00 mm sifting sample. As for ~(210)Pb measurement, the decrease of sieve diameters extended to touch the acceptable value of analysis precision but showed no significant effect on the specific activity. These results played an important role in enhancing the analysis precision of the specific activity of ~(137)Cs and ~(210)Pb in soil samples using HPGeγ Spectrometry.
学科主题	农业基础科学
语种	中文
内容类型	期刊论文
源URL	[http://111.203.20.206/handle/2HMLN22E/17039]
专题	农业环境与可持续发展研究所_生态安全研究室
作者单位	1.中国农业科学院农业环境与可持续发展研究所, 北京, 100081 2.河南师范大学生命科学学院, 河南, 新乡, 453000
推荐引用方式 GB/T 7714	刘叶涵,李勇,于寒青,等. 过筛粒径大小对HPGeγ谱仪测定~(137)Cs和~(210)Pb的影响[J]. 核农学报,2012,26(8):1172-1177.
APA	刘叶涵,李勇,于寒青,&耿肖臣.(2012).过筛粒径大小对HPGeγ谱仪测定~(137)Cs和~(210)Pb的影响.核农学报,26(8),1172-1177.
MLA	刘叶涵,et al."过筛粒径大小对HPGeγ谱仪测定~(137)Cs和~(210)Pb的影响".核农学报 26.8(2012):1172-1177.