Improved localization of a 'hot spot' in the lungs for an array of four HPGe detectors - The isotopic ratio effect

O. Pelled; U. German; A. Abraham; S. Tsroya; Z. B. Alfassi

doi:10.1093/rpd/ncm147

Improved localization of a 'hot spot' in the lungs for an array of four HPGe detectors - The isotopic ratio effect

O. Pelled, U. German, A. Abraham, S. Tsroya, Z. B. Alfassi

Unit of Nuclear Engineering

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Considerable errors in the determination of radioactivity in lungs are caused by the usual assumption of homogeneous distribution, while actually the radioactive contamination can be distributed, and even in the form of a 'hot spot'. Modern lung counter systems use several HPGe detectors, and the ratio of the different count rates of the detectors can be used to locate a 'hot spot' and apply correction algorithms for activity calculation. In the present work it is shown that the variability of the isotopic composition of the uranium source has a major effect on the process of localization of the 'hot spot' in the lungs. A way to eliminate this effect is proposed by separate normalization of the count rates of each energy peak.

Original language	English
Pages (from-to)	465-468
Number of pages	4
Journal	Radiation Protection Dosimetry
Volume	125
Issue number	1-4
DOIs	https://doi.org/10.1093/rpd/ncm147
State	Published - 1 Dec 2007

ASJC Scopus subject areas

Radiation
Radiological and Ultrasound Technology
Radiology Nuclear Medicine and imaging
Public Health, Environmental and Occupational Health

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10.1093/rpd/ncm147

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AU - Tsroya, S.

AU - Alfassi, Z. B.

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AB - Considerable errors in the determination of radioactivity in lungs are caused by the usual assumption of homogeneous distribution, while actually the radioactive contamination can be distributed, and even in the form of a 'hot spot'. Modern lung counter systems use several HPGe detectors, and the ratio of the different count rates of the detectors can be used to locate a 'hot spot' and apply correction algorithms for activity calculation. In the present work it is shown that the variability of the isotopic composition of the uranium source has a major effect on the process of localization of the 'hot spot' in the lungs. A way to eliminate this effect is proposed by separate normalization of the count rates of each energy peak.

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Improved localization of a 'hot spot' in the lungs for an array of four HPGe detectors - The isotopic ratio effect

Abstract

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