A method for characterizing photon radiation fields

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Uncertainty in dosimetric and exposure rate measurements can increase in areas where multi-directional and low-energy photons (< 100 keV) exist because of variations in energy and angular measurement response. Also, accurate measurement of external exposures in spatially non-uniform fields may require multiple dosimetry. Therefore, knowledge of the photon fields in the workplace is required for full understanding of the accuracy of dosimeters and instruments, and for determining the need for multiple dosimeters. This project was designed to develop methods to characterize photon radiation fields in the workplace, and to test the methods in a plutonium facility. The photon field at ... continued below

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14 p.

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Whicker, J.J.; Hsu, H.H.; Hsieh, F.H. & Borak, T.B. April 1, 1999.

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Description

Uncertainty in dosimetric and exposure rate measurements can increase in areas where multi-directional and low-energy photons (< 100 keV) exist because of variations in energy and angular measurement response. Also, accurate measurement of external exposures in spatially non-uniform fields may require multiple dosimetry. Therefore, knowledge of the photon fields in the workplace is required for full understanding of the accuracy of dosimeters and instruments, and for determining the need for multiple dosimeters. This project was designed to develop methods to characterize photon radiation fields in the workplace, and to test the methods in a plutonium facility. The photon field at selected work locations was characterized using TLDs and a collimated NaI(Tl) detector from which spatial variations in photon energy distributions were calculated from measured spectra. Laboratory results showed the accuracy and utility of the method. Field measurement results combined with observed work patterns suggested the following: (1) workers are exposed from all directions, but not isotropically, (2) photon energy distributions were directionally dependent, (3) stuffing nearby gloves into the glovebox reduced exposure rates significantly, (4) dosimeter placement on the front of the chest provided for a reasonable estimate of the average dose equivalent to workers` torsos, (5) justifiable conclusions regarding the need for multiple dosimetry can be made using this quantitative method, and (6) measurements of the exposure rates with ionization chambers pointed with open beta windows toward the glovebox provided the highest measured rates, although absolute accuracy of the field measurements still needs to be assessed.

Physical Description

14 p.

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INIS; OSTI as DE99002414

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  • Annual Health Physics Society meeting, Philadelphia, PA (United States), 28 Jun - 1 Jul 1999

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  • Other: DE99002414
  • Report No.: LA-UR--99-662
  • Report No.: CONF-990614--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 353358
  • Archival Resource Key: ark:/67531/metadc682997

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 1, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 5, 2016, 7:36 p.m.

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Whicker, J.J.; Hsu, H.H.; Hsieh, F.H. & Borak, T.B. A method for characterizing photon radiation fields, article, April 1, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc682997/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.