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HSE performance tests for dosimetry services.

R Birch1, J A Simpson, R P Hedley

  • 1AEA Technology plc, Oxfordshire, UK. richard.birch@aeat.co.uk

Journal of Radiological Protection : Official Journal of the Society for Radiological Protection
|January 5, 2001
PubMed
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UK dosimetry services performance tests show film badges and thermoluminescent dosemeters (TLDs) are adequate for routine whole-body radiation monitoring. However, performance varies at higher doses and for extremity/accident dosimetry.

Area of Science:

  • Medical Physics
  • Radiation Protection
  • Dosimetry

Background:

  • External radiation dose assessment in the UK requires dosimetry services to pass performance tests.
  • Six years of performance test results from AEA Technology and DRaStaC are analyzed.
  • Tests evaluate routine whole-body, extremity/skin, and special accident dosimetry services.

Purpose of the Study:

  • To present and analyze the results of UK dosimetry service performance tests.
  • To compare dosemeter performance against UK Health and Safety Executive criteria.
  • To identify performance trends for different dosimetry types and dose ranges.

Main Methods:

  • Groups of dosemeters were irradiated with known doses of gamma radiation.
  • Bias and relative standard deviations were calculated for each dose group.

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  • Results were compared against established pass criteria.

    • Main Results:

    • Film badges and TLDs performed adequately for routine whole-body doses (0.6-30 mSv).
    • Film badges showed poorer performance and overestimated doses at higher levels (up to 250 mSv).
    • Extremity/skin dosimetry showed wider result variations; film badges underestimated high accident doses, while TLDs overestimated them.

    Conclusions:

    • Routine whole-body dosimetry using film badges and TLDs meets UK standards within specified ranges.
    • Performance limitations exist for film badges at higher doses and for extremity/accident dosimetry.
    • Thermoluminescent dosemeters (TLDs) and film badges exhibit different error tendencies at high doses.