SEVENTH DOE WORKSHOP ON PERSONNEL NEUTRON DOSIMETRY

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This workshop was the seventh of a series and was held on October 23-24. 1978, at the Central Electricity Generating Board, HQ, London, England. Typically~ attendees at the Workshop were concerned with one of three activities: studying and refining existing techniques in an attempt to quantify already-known parameters with greater precision, looking for ways to apply existing neutron dosirr:etry techniques to a specific local problem, identifying the needs and weaknesses of existing systems, with the goal of improving and passibly simplifying field measurements. The types of neutron dosimetry techniques discussed by participants included albedo dosimeters, track etch, and TLD. One ... continued below

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Vallario, E. J. October 24, 1978.

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Description

This workshop was the seventh of a series and was held on October 23-24. 1978, at the Central Electricity Generating Board, HQ, London, England. Typically~ attendees at the Workshop were concerned with one of three activities: studying and refining existing techniques in an attempt to quantify already-known parameters with greater precision, looking for ways to apply existing neutron dosirr:etry techniques to a specific local problem, identifying the needs and weaknesses of existing systems, with the goal of improving and passibly simplifying field measurements. The types of neutron dosimetry techniques discussed by participants included albedo dosimeters, track etch, and TLD. One speaker reported on NTA film, noting that fading could be eliminated by drying the emulsion in dry nitrogen before field use. There were no reports on tissue equivalent proportional counters or activation analysis. One participant discussed a metal oxide silicon dosimeter. The need to develop a consistent standard terminology, as well as calibration sources and techniques, on both the national and international level was evident. The need for standardization is particularly acute in the U.S. Techniques for evaluating dosimeter response in the field should he standardized, since several different instruments with widely different response characteristics are currently being used. The choice of instruments is often parochial. Also. the type and use of phantoms should be standardized. Neutron dose assignment is significantly affected by the position of the dosimeter on the body. for example, a typical albedo dosimeter may give differences of up to 20% depending on whether it is worn on the belt or chest. Larger errors are encountered with front-to-back (angular} orientation. 1n an attempt to minimize such errors~ at least two European facilities are using neutron dosimeter belts, which provide dosimeters both in front and in back of the wearer. The gamma-to-neutron ratio around nuclear power plants varies significantly. According to actual survey data these ratios range from 40:1 to 1:10 (gamma-toneutron). Although a large fraction of the dose results from neutrons in the 0.1 to 1 MeV energy region, most existing dosimeters 1} do not respond or respond inadequately to this range. or 2} are incapable of determining dose in this interval because of their high overresponse to lower energies, which effectively masks the region of interest.

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  • Report No.: PNL-2807
  • Grant Number: EY-76-C-06-1830
  • Office of Scientific & Technical Information Report Number: 1072023
  • Archival Resource Key: ark:/67531/metadc828959

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  • October 24, 1978

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • June 3, 2016, 12:26 p.m.

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Vallario, E. J. SEVENTH DOE WORKSHOP ON PERSONNEL NEUTRON DOSIMETRY, report, October 24, 1978; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc828959/: accessed August 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.