Transverse BGO Compton suppression shield

doi:10.1016/0168-9002(86)90943-5

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

Volume 252, Issue 1, 15 November 1986, Pages 91-94

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Abstract

The performance of a Compton suppressed Ge spectrometer, that utilizes a transverse BGO suppression shield, is presented. A comparison of the experimental measurements and Monte Carlo calculations is made.

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Cited by (43)

Performance of a Ge-BGO Compton-suppression spectrometer and its application to photon activation analysis
1996, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
A Compton-suppression spectrometer, consisting of a pure Ge detector and BGO shield detectors is described. A cylindrical symmetry type of the shield detector configuration, with the Ge detector inserted on the symmetry axis, has been designed. The Compton-suppression factor is 6.0 for the photopeak of ⁶⁰Co at 1332.5 keV. The peak-to-Compton ratio for the peak is 42 : 1 when the BGO detectors are used as a passive shield only, and is 250 : 1 in the suppression mode. Photon activation analysis with this detector has been made for the determination of trace elements in a bulk dysprosium sample. The signal-to-noise ratio for detecting trace elements in the sample has been improved by a factor from 1.3 to 3.1 by Compton suppression compared with that obtained in the non-suppression mode.
Development of an anti-Compton shield for a Si(Li) detector employed in PIXE analysis
1995, Nuclear Inst. and Methods in Physics Research, B
The paper reports on the installation and operation of an anti-Compton shield inside the cryostat of a Si(Li) detector. The shield is used for the suppression of γ-ray induced background in PIXE spectra. For the initial experiments presented, a plastic scintillator was employed as a shield. It was mounted behind the Si(Li) crystal, surrounding the cold finger. Initial tests showed a 6% suppression of the Compton background in the interval 6–32 keV of the PIXE spectrum, both for 662 keV γ-rays from a¹³⁷Cs source and for 122 keV γ-rays from a⁵⁷Co source. The details of the system and the potentials of the technique are presented and discussed.
Techniques and problems of low-level gamma-ray spectrometry
1992, International Journal of Radiation Applications and Instrumentation. Part
The origin of background events from internal and external sources is reviewed and methods of passive and active shielding are presented. It is shown that the shape of the background under a peak or multiplet can be evaluated directly from the experimental data without the use of a mathematical model shape. An algorithm for the computerized sub-division of a spectrum into regions is shown and problems associated with smoothing and automatic photopeak, or full energy-peak, detection methods are discussed. A time-dependent spectral analysis is taken as an example to demonstrate the use of averaging or trend analyses in quantitative spectrometry.
A GeNaI(Tl) spectrometer with Compton suppression and gamma coincidence counting. Application to 189Ir and 101Rh activity measurements
1991, Nuclear Inst. and Methods in Physics Research, A
This article presents the characteristics of a spectrometer consisting of a Ge detector surrounded by a NaI(Tl) detector that can operate in Compton-suppression and gamma-gamma coincidence modes. The criteria that led to this measurement configuration are discussed and the spectrometer performances are shown for ⁶⁰Co and ¹³⁷Cs gamma-ray sources. The results for the measurement of ¹⁸⁹Ir (Compton suppression) and for the measurement of ¹⁰¹Rh (gamma-gamma coincidence) in the presence of other radioisotopes are given.
Limitation of the Compton suppression in Ge-BGO Compton suppression spectrometers
1989, Nuclear Inst. and Methods in Physics Research, A
A detailed study of the NORDBALL Ge-BGO Compton suppression spectrometers has been performed. Special emphasis has been given to photoelectron yields of the scintillators, optimisation of charge integration in the electronics and the low energy thresholds of the BGO detectors. The time relation between the Ge detector and the BGO scintillator logic pulses has been studied in detail. Maximum Compton suppression factors of 12.0 and 12.7 have been measured for ⁶⁰Co and ¹³⁷Cs γ-rays respectively. Photon events observed between the full energy peak and the Compton edge suggest that other effects than multiple Compton scattering are involved. Such effects are usually not included in Monte Carlo simulations and could be the explanation of the factor of 2 deficiency between calculated and measured suppression ratios.
High spin states in 172Ta and additivity of odd N and odd Z effects
1988, Physics Letters B
Several rotational structures have been identified in ¹⁷²Ta. The doubly decoupled $∼π 12^{−} [541]⊗∼v 12^{−} [521]$ band has been followed beyond the first backbend and a crossing frequency has been extracted which is almost the average between the values found for the participating orbitals in neighboring odd mass nuclei. Striking additivity properties concerning both deviations of inertia parameters and alignments are shown to be a systematic feature of these structures. These results may be at variance with earlier assertions on the deformation driving tendency of the $∼πh_{92}$ orbital and with the exclusive $∼v^{2}_{sol132}$ chara cter of the first band crossing.

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

Abstract

References (8)

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Cited by (43)

Performance of a Ge-BGO Compton-suppression spectrometer and its application to photon activation analysis

Development of an anti-Compton shield for a Si(Li) detector employed in PIXE analysis

Techniques and problems of low-level gamma-ray spectrometry

A GeNaI(Tl) spectrometer with Compton suppression and gamma coincidence counting. Application to <sup>189</sup>Ir and <sup>101</sup>Rh activity measurements

Limitation of the Compton suppression in Ge-BGO Compton suppression spectrometers

High spin states in <sup>172</sup>Ta and additivity of odd N and odd Z effects