Gamma-ray spectrometry of LDEF samples

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A total of 31 samples from the Long Duration Exposure Facility (LDEF), including materials of aluminum, vanadium, and steel trunnions were analyzed by ultra-low-level gamma spectroscopy. The study quantified particle induced activations of (sup 22)Na, {sup 46}Sc, {sup 51}Cr, {sup 54}Mn, {sup 56}Co, {sup 57}Co, {sup 58}Co, and {sup 60}Co. The samples of trunnion sections exhibited increasing activity toward the outer end of the trunnion and decreasing activity toward its radial center. The trunnion sections did not include end pieces, which have been reported to collect noticeable {sup 7}Be on their leading surfaces. No significant {sup 7}Be was detected in ... continued below

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Pages: (62 p)

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Winn, W.G. January 1, 1991.

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Description

A total of 31 samples from the Long Duration Exposure Facility (LDEF), including materials of aluminum, vanadium, and steel trunnions were analyzed by ultra-low-level gamma spectroscopy. The study quantified particle induced activations of (sup 22)Na, {sup 46}Sc, {sup 51}Cr, {sup 54}Mn, {sup 56}Co, {sup 57}Co, {sup 58}Co, and {sup 60}Co. The samples of trunnion sections exhibited increasing activity toward the outer end of the trunnion and decreasing activity toward its radial center. The trunnion sections did not include end pieces, which have been reported to collect noticeable {sup 7}Be on their leading surfaces. No significant {sup 7}Be was detected in the samples analyzed. The Underground Counting Facility at Savannah River Laboratory (SRL) was used in this work. The facility is 50 ft. underground, constructed with low-background shielding materials, and operated as a clean room. The most sensitive analyses were performed with a 90%-efficient HPGe gamma-ray detector, which is enclosed in a purged active/passive shield. Each sample was counted for one to six days in two orientations to yield more representative average activities for the sample. The non-standard geometries of the LDEF samples prompted the development of a novel calibration method, whereby the efficiency about the samples surfaces (measured with point sources) predicted the efficiency for the bulk sample.

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Pages: (62 p)

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OSTI; NTIS; GPO Dep.

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  • Other: DE92009947
  • Report No.: WSRC-RD-91-16
  • Grant Number: AC09-89SR18035
  • DOI: 10.2172/5637883 | External Link
  • Office of Scientific & Technical Information Report Number: 5637883
  • Archival Resource Key: ark:/67531/metadc1093449

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  • January 1, 1991

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • May 15, 2018, 4:09 p.m.

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Winn, W.G. Gamma-ray spectrometry of LDEF samples, report, January 1, 1991; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc1093449/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.