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Two methods for examining angular response of personnel dosimeters.

P Plato1, R Leib, J Miklos

  • 1School of Public Health, University of Michigan, Ann Arbor 48109.

Health Physics
|June 1, 1988
PubMed
Summary

This study evaluated methods for testing personnel dosimeter angular response, crucial for dosimetry accreditation. A rotating phantom irradiation method is recommended as more cost-effective than static irradiations for improving accuracy.

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Accreditation Standards

Background:

  • The American National Standard ANSI N13.11-1983 is integral to the National Voluntary Laboratory Accreditation Program (NVLAP) for dosimetry processor accuracy.
  • Section 3.8 of ANSI N13.11-1983 mandates angular response studies for dosimeters, but lacks pass/fail criteria, leading to its exclusion from NVLAP accreditation.
  • This exclusion has resulted in a lack of organized angular response data generation.

Purpose of the Study:

  • To investigate the feasibility of two alternative methods for assessing the angular response of personnel dosimeters.
  • To provide data supporting potential amendments to the ANSI N13.11-1983 standard regarding angular response testing.

Main Methods:

  • Evaluated static irradiations with dosimeters fixed at specific angles relative to a radiation source.

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  • Assessed dynamic irradiations using a rotating phantom to simulate varying angular exposures.
  • Utilized a Panasonic UD-802 personnel dosimetry system for data acquisition in both methods.

    • Main Results:

    • Static irradiations provided data but were less comprehensive for angular response evaluation.
    • Dynamic irradiations using a rotating phantom yielded more representative angular response data.
    • The rotating phantom method demonstrated greater cost-effectiveness for generating essential angular response data.

    Conclusions:

    • The ANSI N13.11-1983 standard should be revised to include mandatory pass/fail criteria for personnel dosimeter angular response testing.
    • Implementing a rotating phantom irradiation method is a more efficient and cost-effective approach for NVLAP-accredited dosimetry programs.
    • Improved angular response testing will enhance the overall accuracy and reliability of personnel dosimetry.