137Cs measurement uncertainties and detection limits for airborne gamma spectrometry (AGS) data analysed using a spectral windows method

Cresswell, A.J.; Sanderson, David; White, Daniel

doi:10.1016/j.apradiso.2005.07.013

Cited by 16 publications

(10 citation statements)

References 6 publications

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“…For activity concentrations above weapons testing levels, uncertainties on the calibrated values for a single measurement are typically less than 30% (Cresswell et al 2006). For naturally occurring activity, typical gross count rates for K, eU and eTh are 20-100 cps, 10-40 cps and 5-30 cps respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Co (Sanderson et al 2001, Cresswell et al 2006. Background count rates, resulting from internal activity in the detector and aircraft and a cosmic ray component, are determined over water and subtracted from the gross count rates in each spectral window.…”

Section: Methodsmentioning

confidence: 99%

“…Cs activity concentrations, these methods and the standard spectral windows method have been shown to produce comparable results (Sanderson et al 2003, Cresswell et al 2006. As this work involved producing data sets with differing number of measurements, and the number of measurements affects the outcome of the newer statistical approaches, the standard spectral windows method is preferred for this work.…”

mentioning

confidence: 99%

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The effect of flight line spacing on radioactivity inventory and spatial feature characteristics of airborne gamma‐ray spectrometry data

Sanderson

Cresswell

White

2008

International Journal of Remote Sensing

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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The effect of flight line spacing on radioactivity inventory and spatial feature characteristics of airborne gamma‐ray spectrometry data

Sanderson

Cresswell

White

2008

International Journal of Remote Sensing

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“…The assumption of secular equilibrium of the decay chains is required in order to use this approach. In addition to the abovementioned radionuclides, the three-windows method has been extended to the measurement of 137 Cs (Cresswell et al 2006;Sanderson et al 1989).…”

Section: Introductionmentioning

confidence: 99%

A new FSA approach for in situ γ ray spectroscopy

Caciolli¹,

Baldoncini²,

Bezzon³

et al. 2012

Science of The Total Environment

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An increasing demand of environmental radioactivity monitoring comes both from the scientific community and from the society. This requires accurate, reliable and fast response preferably from portable radiation detectors. Thanks to recent improvements in the technology, γ spectroscopy with sodium iodide scintillators has been proved to be an excellent tool for in-situ measurements for the identification and quantitative determination of γ ray emitting radioisotopes, reducing time and costs. Both for geological and civil purposes not only (40)K, (238)U, and (232)Th have to be measured, but there is also a growing interest to determine the abundances of anthropic elements, like (137)Cs and (131)I, which are used to monitor the effect of nuclear accidents or other human activities. The Full Spectrum Analysis (FSA) approach has been chosen to analyze the γ spectra. The Non Negative Least Square (NNLS) and the energy calibration adjustment have been implemented in this method for the first time in order to correct the intrinsic problem related with the χ(2) minimization which could lead to artifacts and non physical results in the analysis. A new calibration procedure has been developed for the FSA method by using in situ γ spectra instead of calibration pad spectra. Finally, the new method has been validated by acquiring γ spectra with a 10.16 cm × 10.16 cm sodium iodide detector in 80 different sites in the Ombrone basin, in Tuscany. The results from the FSA method have been compared with the laboratory measurements by using HPGe detectors on soil samples collected particular, the (137)Cs isotopes has been implemented in the analysis since it has been found not negligible during the in-situ measurements.

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“…Standard spectral windows processing, where the count rates in predefined regions of interest are analysed by the subtraction of a fixed detector background followed by stripping out of interferences from other peaks and an altitude correction and calibration [1][2][3]15], has been widely used in real-time applications [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

The use of difference spectra with a filtered rolling average background in mobile gamma spectrometry measurements

Cresswell

Sanderson

2009

Nuclear Instruments and Methods in Physics Research Section A:

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137Cs measurement uncertainties and detection limits for airborne gamma spectrometry (AGS) data analysed using a spectral windows method

Abstract: . (2006)

Cited by 16 publications

References 6 publications

The effect of flight line spacing on radioactivity inventory and spatial feature characteristics of airborne gamma‐ray spectrometry data

The effect of flight line spacing on radioactivity inventory and spatial feature characteristics of airborne gamma‐ray spectrometry data

A new FSA approach for in situ γ ray spectroscopy

The use of difference spectra with a filtered rolling average background in mobile gamma spectrometry measurements

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