HPGe Detector Efficiency Calibration Using HEU Standards

Salaymeh, S.R.

doi:10.2172/765406

Cited by 7 publications

(4 citation statements)

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“…Using the geometry correction equation of Analytical Development Directorate SRNS-STI-2011-00224 Savannah River National Laboratory page 2 of 28 4/29/2011 reference 1, we calculate geometry correction values using the known detector and source dimensions combined with source to detector distances. We then compare measured detection efficiencies from a cylindrical shell of activity for the 185.7-keV photon (U-235) and for the 414.3-keV photon (Pu-239) with those determined for a 12-inch point source (2,7) to demonstrate agreement between experiment and the theoretically calculated values derived by the Savannah River National Laboratory (SRNL) authors of reference 1. We demonstrate this geometry correction first for the 185.7-and 414.3-keV -rays.…”

Section: Introductionmentioning

confidence: 86%

Four pi calibration and modeling of a bare germanium detector in a cylindrical field source

Dewberry

Young

2012

Review of Scientific Instruments

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In this paper we describe a 4π cylindrical field acquisition configuration surrounding a bare (unshielded, uncollimated) high purity germanium detector. We perform an efficiency calibration with a flexible planar source and model the configuration in the 4π cylindrical field. We then use exact calculus to model the flux on the cylindrical sides and end faces of the detector. We demonstrate that the model accurately represents the experimental detection efficiency compared to that of a point source and to Monte Carlo N-particle (MCNP) calculations of the flux. The model sums over the entire source surface area and the entire detector surface area including both faces and the detector's cylindrical sides. Agreement between the model and both experiment and the MCNP calculation is within 8%.

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Section: Introductionmentioning

confidence: 86%

Four pi calibration and modeling of a bare germanium detector in a cylindrical field source

Dewberry

Young

2012

Review of Scientific Instruments

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“…The content of each scrap can is measured by the traditional transmission-corrected assay using a combination of data as described above and using equations (1) and (3). Each assay is shown completely in a single line of the spreadsheet of Table 2.…”

Section: Transmission Correction Techniquementioning

confidence: 99%

High Purity Germanium Gamma-PHA Assay of Uranium in Scrap Cans for 321-M Facility

Salaymeh¹

2002

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“…3 The latter configuration required no assumptions regarding geometry. We attempted to adopt a similar approach for the uranium storage pigs.…”

Section: Deming Calibration and Measurementmentioning

confidence: 99%

“…At a distance of r=25.5 inches, the effective length of view of the detector is 89.30 cm (3,6) , yielding a line source calibration constant of 0.00154±0.00009 g-sec/cm. From this constant the 235 U content in grams of each pig viewed in the approximate line source configuration described above is From the QC data acquired and from the Deming data acquired we have derived a transmission correction factor of 3.27±0.31 for an empty pig.…”

Section: Line Source Calibration and Measurementmentioning

confidence: 99%

High Purity Germanium Gamma-PHA Assay of Uranium Storage Pigs for 321-M Facility

Dewberry¹

2001

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The Analytical Development Section of SRTC was requested by the Facilities Disposition Division (FDD) to determine the holdup of enriched uranium in the 321-M facility as part of an overall deactivation project of the facility. The 321-M facility was used to fabricate enriched uranium fuel assemblies, lithium-aluminum target tubes, neptunium assemblies, and miscellaneous components for the production reactors. The facility also includes the 324-M storage building and the passageway connecting it to 321-M. The results of the holdup assays are essential for determining compliance with the Solid Waste's Waste Acceptance Criteria, Material Control & Accountability, and to meet criticality safety controls. This report describes and documents the use of a portable HPGe detector and EG&G Dart system that contains a high voltage power supply, signal processing electronics, a personal computer with Gamma-Vision software, and space to store and manipulate multiple 4096-channel γ-ray spectra to assay for 235 U content in 268 uranium shipping and storage pigs. This report includes a description of three efficiency calibration configurations and also the results of the assay. A description of the quality control checks is included as well.

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HPGe Detector Efficiency Calibration Using HEU Standards

Cited by 7 publications

References 0 publications

Four pi calibration and modeling of a bare germanium detector in a cylindrical field source

Four pi calibration and modeling of a bare germanium detector in a cylindrical field source

High Purity Germanium Gamma-PHA Assay of Uranium in Scrap Cans for 321-M Facility

High Purity Germanium Gamma-PHA Assay of Uranium Storage Pigs for 321-M Facility

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