On-Site Inspection RadioIsotopic Spectroscopy (Osiris) System Development

Caffrey, Gus; Egger, A.E.; Krebs, K.M.; Milbrath, Brian D.; Jordan, David V.; Warren, G.; Wilmer, N. G.

doi:10.2172/1228080

Cited by 1 publication

(1 citation statement)

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“…The entire code was validated against experimental measurements of fission spectra of equal sample ages [8]. Furthermore, we received 80 spectra that were generated using GEANT4 in order to demonstrate measurement restriction in references [6] and [11]. These spectra represent various sample ages starting from 2 days to 1.5 years after the event by propagating the radionuclide activities in time using the appropriate yields and decay chains.…”

Section: Methods Testingmentioning

confidence: 99%

A method for limiting data acquisition in a high-resolution gamma-ray spectrometer during On-Site Inspection activities under the Comprehensive Nuclear-Test-Ban Treaty

Aviv

Lipshtat

2018

J. Inst.

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A: On-Site Inspection (OSI) activities under the Comprehensive Nuclear-Test-Ban Treaty (CTBT) allow limitations to measurement equipment. Thus, certain detectors require modifications to be operated in a restricted mode. The accuracy and reliability of results obtained by a restricted device may be impaired. We present here a method for limiting data acquisition during OSI. Limitations are applied to a high-resolution high-purity germanium detector system, where the vast majority of the acquired data that is not relevant to the inspection is filtered out. The limited spectrum is displayed to the user and allows analysis using standard gamma spectrometry procedures. The proposed method can be incorporated into commercial gamma-ray spectrometers, including both stationary and mobile-based systems. By applying this procedure to more than 1000 spectra, representing various scenarios, we show that partial data are sufficient for reaching reliable conclusions. A comprehensive survey of potential false-positive identifications of various radionuclides is presented as well. It is evident from the results that the analysis of a limited spectrum is practically identical to that of a standard spectrum in terms of detection and quantification of OSI-relevant radionuclides. A future limited system can be developed making use of the principles outlined by the suggested method.

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Section: Methods Testingmentioning

confidence: 99%