18F Half-life measurement using 2-γ coincidence method

Y. S. Kang; J. K. Ahn; S. H. Kim; J. I. Byun; J. B. Han; K. B. Lee

doi:10.1016/j.nima.2015.08.025

¹⁸F Half-life measurement using 2-γ coincidence method

Y. S. Kang, J. K. Ahn, S. H. Kim, J. I. Byun, J. B. Han, K. B. Lee

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

4 Citations (Scopus)

Abstract

The accuracy of the half-life measurement of short-lived radioisotopes such as positron-emitting ¹⁸F (τ1_/2 ≈ 100min) is limited mainly by inaccuracies in the detector counting statistics. Gamma-ray measurement with a high-activity ¹⁸F source requires counting-loss corrections to compensate for random summing effects and the detector's dead time. In this study, we measure the half-life of ¹⁸F with two 511-keV γ-rays using two high-purity germanium (HPGe) detectors. The counting-loss corrections are performed via two approaches to address the problems of random coincidence summing and dead time: a half-life measurement with a ²²Na source and a Geant4 simulation of the detector response. Variations in the full-width at half maximum (FWHM) of the 511-keV peak are found to show good correlation with the random summing effect. The half-life of ¹⁸F is estimated as 109.73±0.14min.

Original language	English
Pages (from-to)	7-10
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	801
DOIs	https://doi.org/10.1016/j.nima.2015.08.025
Publication status	Published - 2015 Nov 21

Bibliographical note

Funding Information:
This work was supported by a Korea University Grant .

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

Keywords

Coincidence measurement
Dead time correction
F
HPGe detector

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

Access to Document

10.1016/j.nima.2015.08.025

Cite this

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title = "18F Half-life measurement using 2-γ coincidence method",

abstract = "The accuracy of the half-life measurement of short-lived radioisotopes such as positron-emitting 18F (τ1/2 ≈ 100min) is limited mainly by inaccuracies in the detector counting statistics. Gamma-ray measurement with a high-activity 18F source requires counting-loss corrections to compensate for random summing effects and the detector's dead time. In this study, we measure the half-life of 18F with two 511-keV γ-rays using two high-purity germanium (HPGe) detectors. The counting-loss corrections are performed via two approaches to address the problems of random coincidence summing and dead time: a half-life measurement with a 22Na source and a Geant4 simulation of the detector response. Variations in the full-width at half maximum (FWHM) of the 511-keV peak are found to show good correlation with the random summing effect. The half-life of 18F is estimated as 109.73±0.14min.",

keywords = "Coincidence measurement, Dead time correction, F, HPGe detector",

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AU - Kang, Y. S.

AU - Ahn, J. K.

AU - Kim, S. H.

AU - Byun, J. I.

AU - Han, J. B.

AU - Lee, K. B.

PY - 2015/11/21

Y1 - 2015/11/21

N2 - The accuracy of the half-life measurement of short-lived radioisotopes such as positron-emitting 18F (τ1/2 ≈ 100min) is limited mainly by inaccuracies in the detector counting statistics. Gamma-ray measurement with a high-activity 18F source requires counting-loss corrections to compensate for random summing effects and the detector's dead time. In this study, we measure the half-life of 18F with two 511-keV γ-rays using two high-purity germanium (HPGe) detectors. The counting-loss corrections are performed via two approaches to address the problems of random coincidence summing and dead time: a half-life measurement with a 22Na source and a Geant4 simulation of the detector response. Variations in the full-width at half maximum (FWHM) of the 511-keV peak are found to show good correlation with the random summing effect. The half-life of 18F is estimated as 109.73±0.14min.

AB - The accuracy of the half-life measurement of short-lived radioisotopes such as positron-emitting 18F (τ1/2 ≈ 100min) is limited mainly by inaccuracies in the detector counting statistics. Gamma-ray measurement with a high-activity 18F source requires counting-loss corrections to compensate for random summing effects and the detector's dead time. In this study, we measure the half-life of 18F with two 511-keV γ-rays using two high-purity germanium (HPGe) detectors. The counting-loss corrections are performed via two approaches to address the problems of random coincidence summing and dead time: a half-life measurement with a 22Na source and a Geant4 simulation of the detector response. Variations in the full-width at half maximum (FWHM) of the 511-keV peak are found to show good correlation with the random summing effect. The half-life of 18F is estimated as 109.73±0.14min.

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