Preliminary development of a wall-less gas-flow proportional counter for in-situ field analysis of nuclear contamination in soil

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This study resulted in the design, construction and testing of a gas flow proportional counter for in-situ determination of soil contamination. The uniqueness of this detector is the screened material used for the cathode. A Pu-239 source of 0.006 {micro}Ci was mounted to the outside of the cathode to simulate radioactive soil. The detector probe was placed into a laboratory mock-up and tested to determine operating voltage, efficiency and energy resolution. Two gas flow proportional counters were built and tested. The detectors are cylindrical, each with a radius of 1.905 cm, having an anode wire with a radius of 0.0038 ... continued below

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Medium: P; Size: 37 p.

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Bush, S.P.; Hamby, D.M. & Martin, J.E. March 1, 1997.

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Description

This study resulted in the design, construction and testing of a gas flow proportional counter for in-situ determination of soil contamination. The uniqueness of this detector is the screened material used for the cathode. A Pu-239 source of 0.006 {micro}Ci was mounted to the outside of the cathode to simulate radioactive soil. The detector probe was placed into a laboratory mock-up and tested to determine operating voltage, efficiency and energy resolution. Two gas flow proportional counters were built and tested. The detectors are cylindrical, each with a radius of 1.905 cm, having an anode wire with a radius of 0.0038 cm. The length of the smaller detector S anode was 2.54 cm, and the length of the larger detector S anode was 7.64 cm. Therefore, the active volumes were 28.96 cm{sup 3} and 87.10 cm{sup 3}, respectively, for the small and large detector. An operating voltage of 1975 volts was determined to be sufficient for both detectors. The average efficiency was 2.59 {+-} 0.12% and 76.71 {+-} 10.81% for the small volume and large volume detectors, respectively. The average energy resolution for the low-energy peak of the small detector was 4.24 {+-} 1.28% and for the large-energy peak was 1.37 {+-} 0.66%. The large detectors energy resolution was 17.75 {+-} 3.74%. The smaller detector, with better energy resolution, exhibited a bi-modal spectrum, whereas the larger detector S spectrum centered around a single broad peak.

Physical Description

Medium: P; Size: 37 p.

Notes

INIS; OSTI as DE99001162

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  • Other Information: PBD: Mar 1997

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  • Other: DE99001162
  • Report No.: DOE/EW/00001--T2-Pt.2
  • Grant Number: FG02-96EW00001
  • DOI: 10.2172/290912 | External Link
  • Office of Scientific & Technical Information Report Number: 290912
  • Archival Resource Key: ark:/67531/metadc688517

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • March 1, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • June 14, 2016, 3:57 p.m.

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Bush, S.P.; Hamby, D.M. & Martin, J.E. Preliminary development of a wall-less gas-flow proportional counter for in-situ field analysis of nuclear contamination in soil, report, March 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc688517/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.