航放数据处理中出现负值的原因及解决方法

doi:10.11720/wtyht.2019.1104

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Abstract

In this paper, the authors processed the navigation data obtained from Alxa Left Banner in Inner Mongolia to summarize the process and main reasons for the formation of the negative value. The results are as follows: ①The nature of radioactive decay has statistical fluctuation, and this property plays an important role in the processing of revised data, especially in areas with low radionuclide; ②A slight negative value of uranium counting rate will occur after background correction and cosmic ray correction, and will increase negatively after atmospheric radon correction; both ends are prone to form high value false anomalies and continuous negative anomalies. After the peel correction, the number of negative values increases greatly, while the height correction and content conversion no longer produce new negative values, but only change the negative values. The authors found that zeroing the negative values generated by the correction process can eliminate high value false anomalies produced by atmospheric radon correction, and that continuous zero value data appear, which is inconsistent with the objective laws. Therefore, normalization method is proposed to eliminate negative values. This method can eliminate the negative value quickly and reasonably, and can control the changed value within a smaller value. In addition, it makes up for the lack and the deficiency of the negative value processing method.

Key words： airborne radioactivity measurement data correction negative value normalization method

Received: 15 March 2018 Published: 10 April 2019

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	Articles by authors
	De-Wei DENG
	Bo YANG
	Yu-Qin YANG
	Xue WU
	Hua-Shan JIA
	Xiang ZHANG
	Yan LUO
	Cheng QI

Cite this article:

De-Wei DENG,Bo YANG,Yu-Qin YANG, et al. Analysis and solution of negative values in airborne radioactivity data processing[J]. Geophysical and Geochemical Exploration, 2019, 43(2): 401-407.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1104 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I2/401

Contrast table of background and cosmic radiation correction

Curve of high value false anomaly after atmospheric radon correction
a—curve of uranium window count after aircraft background and cosmic rays correction;b—contrast curve of the upper uranium window before and after filtering;c—curve of radon background count ;d—curve of uranium window count after atmospheric radon correction

Curve of low value negative anomaly after atmospheric radon correction
a—curve of uranium window count after aircraft background and cosmic rays correction;b—contrast curve of the upper uranium window before and after filtering;c—curve of radon background count ;d—curve of uranium window count after atmospheric radon correction

Distribution graph of negative distribution after correction of atmospheric radon
1—survey area;2—negative measurement point;3—survey line number;4—lower field of uranium content ;5—low field of uranium content

Statistical table of uranium window nagetive after each step correction

Distribution graph of negative distribution after correction of peeling
1—survey area;2—negative measurement point

Contrast curve of atmospheric radon correction effect
a—curve of uranium window count after aircraft background and cosmic rays correction;b—contrast curve of radon background count before and after turning negative to zero;c—contrast curve of uranium window count

Curve of uranium content after zeroing negative value

Contrast curve of uranium content

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