In situ gamma-ray spectrometric measurement of uranium in phosphate soils

Nir-El, Y.; Lavi, N.; Ne’eman, E.; Brenner, S.; Haquin, G.

doi:10.1016/s0265-931x(98)00102-7

Cited by 10 publications

(2 citation statements)

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“…The gamma-ray detection efficiency of these detectors was calibrated by radionuclide gamma-ray point standards, by a powder of 99.9% pure potassium chloride ¶ for 40 K, by a blend of spectrographically pure ThO 2 # with sand of the second (3-6 cm) fraction of the profile, and by two blends of accurately weighed amounts of phosphate soils measured in a previous work (Nir-El et al 1999) for determination of uranium. All calibrands had geometries identical to those of the samples and very similar densities.…”

Section: Laboratory Hpge Detectorsmentioning

confidence: 99%

“…IN SITU gamma-ray spectrometry using a high resolution HPGe detector was applied in a recent work (Nir-El et al 1999) to measure uranium in a phosphate ore quarry. The site measured was a 300 m ϫ 300 m flat, horizontal, unobstructed plot and the thickness of the uniform phosphates layer was 2 m. Hence, the source measured in that application had an "ideal" infinite half-space geometry.…”

Section: Introductionmentioning

confidence: 99%

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IN SITU HOT SPOT MEASUREMENTS WITH HPGe DETECTOR 0.1 M ABOVE GROUND

Nir-El

2000

Health Physics

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The objective of this study was to examine the feasibility of an accurate in situ measurement of radioactive hot spots by a HPGe detector located at a height of 0.1 m above the surface, thus sparing the awkward use of a heavy collimator required at the standard 1 m height. Radioactivity concentrations of primordial naturally occurring 40K, 232Th, 238U and of anthropogenic 137Cs in a sand plot were measured in situ at the two heights. Independently, six fractions of a soil profile collected in the site were measured in the laboratory. Good agreement was found between the results of the two geometries and the soil samples. Good agreement between measured and predicted radioactivity concentration values was obtained for hot spots simulated by uniform planar sources of 40K, 60Co and 137Cs having a circular pattern 0.5 m in diameter. The study shows that an in situ measurement without a collimator but close to a hot spot can provide a reliable result.

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Section: Laboratory Hpge Detectorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%