Wide energy range efficiency calibration method for Ge detectors

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93 Citations (Scopus)

Abstract

A new method is proposed for the relative efficiency calibration of HPGe detectors in the energy range from 50 keV to 11 MeV. By simultaneously fitting all separately measured data sets from calibrated and uncalibrated multigamma sources as well as neutron capture γ-rays with a sum of orthogonal polynomials on a log-log scale, accuracies better than 0.5% between 100 and 3500 keV and better than 1% up to 6000 keV could be achieved for relative full energy peak efficiencies. Dividing the energy range and fitting piecewise with lower-order polynomials does not offer any advantage. Moreover, none of the popular non-linear empirical functions are able to fit the full range. The polynomial fit is nearly indistinguishable from a semiempirical fit. If at least one calibrated γ-ray source is included, the method can be used for absolute efficiencies as well.

Original languageEnglish
Pages (from-to)140-159
Number of pages20
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume489
Issue number1-3
DOIs
Publication statusPublished - Aug 21 2002

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polynomials
Polynomials
Calibration
Detectors
detectors
rays
Neutron sources
energy
neutrons

Keywords

  • Efficiency calibration
  • Ge detector
  • Multigamma source
  • Neutron capture gamma ray
  • Polynomial fit

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics

Cite this

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title = "Wide energy range efficiency calibration method for Ge detectors",
abstract = "A new method is proposed for the relative efficiency calibration of HPGe detectors in the energy range from 50 keV to 11 MeV. By simultaneously fitting all separately measured data sets from calibrated and uncalibrated multigamma sources as well as neutron capture γ-rays with a sum of orthogonal polynomials on a log-log scale, accuracies better than 0.5{\%} between 100 and 3500 keV and better than 1{\%} up to 6000 keV could be achieved for relative full energy peak efficiencies. Dividing the energy range and fitting piecewise with lower-order polynomials does not offer any advantage. Moreover, none of the popular non-linear empirical functions are able to fit the full range. The polynomial fit is nearly indistinguishable from a semiempirical fit. If at least one calibrated γ-ray source is included, the method can be used for absolute efficiencies as well.",
keywords = "Efficiency calibration, Ge detector, Multigamma source, Neutron capture gamma ray, Polynomial fit",
author = "Moln{\'a}r, {G. L.} and Zs R{\'e}vay and T. Belgya",
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TY - JOUR

T1 - Wide energy range efficiency calibration method for Ge detectors

AU - Molnár, G. L.

AU - Révay, Zs

AU - Belgya, T.

PY - 2002/8/21

Y1 - 2002/8/21

N2 - A new method is proposed for the relative efficiency calibration of HPGe detectors in the energy range from 50 keV to 11 MeV. By simultaneously fitting all separately measured data sets from calibrated and uncalibrated multigamma sources as well as neutron capture γ-rays with a sum of orthogonal polynomials on a log-log scale, accuracies better than 0.5% between 100 and 3500 keV and better than 1% up to 6000 keV could be achieved for relative full energy peak efficiencies. Dividing the energy range and fitting piecewise with lower-order polynomials does not offer any advantage. Moreover, none of the popular non-linear empirical functions are able to fit the full range. The polynomial fit is nearly indistinguishable from a semiempirical fit. If at least one calibrated γ-ray source is included, the method can be used for absolute efficiencies as well.

AB - A new method is proposed for the relative efficiency calibration of HPGe detectors in the energy range from 50 keV to 11 MeV. By simultaneously fitting all separately measured data sets from calibrated and uncalibrated multigamma sources as well as neutron capture γ-rays with a sum of orthogonal polynomials on a log-log scale, accuracies better than 0.5% between 100 and 3500 keV and better than 1% up to 6000 keV could be achieved for relative full energy peak efficiencies. Dividing the energy range and fitting piecewise with lower-order polynomials does not offer any advantage. Moreover, none of the popular non-linear empirical functions are able to fit the full range. The polynomial fit is nearly indistinguishable from a semiempirical fit. If at least one calibrated γ-ray source is included, the method can be used for absolute efficiencies as well.

KW - Efficiency calibration

KW - Ge detector

KW - Multigamma source

KW - Neutron capture gamma ray

KW - Polynomial fit

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JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

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