环境放射性核素~(137)Cs和~(210)Pb_(ex)的田间原位测定研究 | |
李勇1; 李俊杰1; Roger Funk2; 李璐1; 张晴雯1 | |
刊名 | 核农学报
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2007 | |
卷号 | 21期号:6页码:612-617 |
关键词 | ISOCS 田间测定 ~(137)Cs ~(210)Pb_ex 内蒙古草原 |
ISSN号 | 1000-8551 |
其他题名 | FIELD OF ENVIRONMENTAL RADIONUCLIDES ~(137)Cs AND ~(210)Pb_ex INVENTORIES USING IN-SITU GAMMA-RAY SPECTROMETRY |
英文摘要 | 原位现场γ谱仪具有快速准确监测土壤中环境放射性核素~(137)Cs和~(210)Pb_(ex)的潜力,可以解决传统环境放射性核素示踪土壤侵蚀在选择参考点和测定时间过长问题。本研究应用现场γ谱仪(ISOCS,In-situ Object Counting System),对内蒙古锡林浩特草原土壤中~(137)Cs和~(210)Pb_(ex)的含量进行了田间原位(不采样)测定,并与室内γ谱仪测定结果进行了比对。结果显示:现场γ谱仪的探头离地面1m,采用90度准直器,测量时间保证3600s以上时,测定的土壤中~(137)Cs面积浓度与室内测定结果一致,二者的平均偏差为8%,表明现场γ谱仪测定具有较高精度,是快速评价土壤侵蚀速率的有效技术~(137)Cs的原位测定结果显著高于室内测定结果,可能由于测定时间较短所致。初步研究结果表明:原位测定具有时间短、精度高的优点,可以克服传统采样造成的空间变异误差。; In-situ measurement of environmental radionuclides~(137)Cs and ~(210)Pb_(ex) has a potential to assess soil erosion and sedimentation rapidly.In this study,we measured the inventories of~(137)Cs and()~(210)Pb_(ex) in the soil of Inner Mongolia grassland using an in-situ gamma detector with the 50 mm shield and Collimator mounted on a cart(ISOCS,Insitu Object Counting System).The detector was set up one meter above the ground with 90° collimator installed: the counting time is more than 3600s.The field survey data were compared with data from laboratory analysis of section cores.The results showed that the mean deviations of measured values between field and laboratory measurements are less than 8%,indicating a high precision for in-situ gamma spectrometry.The inventories of~(210)Pb_(ex) measured by in-situ γ spectrometry were much higher than the laboratory measurements due to a short measurement time in the field.The results from our pilot study indicated that in-situ gamma-ray spectrometry has the following advantages over traditional laboratory measurements: no time consuming sample collection,prompt availability of the results,averaging radionuclide activity over a large area and high precision. |
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/17403] ![]() |
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.德国土壤景观研究所, 明希贝格, 15374 |
推荐引用方式 GB/T 7714 | 李勇,李俊杰,Roger Funk,等. 环境放射性核素~(137)Cs和~(210)Pb_(ex)的田间原位测定研究[J]. 核农学报,2007,21(6):612-617. |
APA | 李勇,李俊杰,Roger Funk,李璐,&张晴雯.(2007).环境放射性核素~(137)Cs和~(210)Pb_(ex)的田间原位测定研究.核农学报,21(6),612-617. |
MLA | 李勇,et al."环境放射性核素~(137)Cs和~(210)Pb_(ex)的田间原位测定研究".核农学报 21.6(2007):612-617. |
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