Topic 17 Measuring Your Occupational Dose: Film Badges, TLDs, Bioassays, Film Badge Reports - PowerPoint PPT Presentation

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Topic 17 Measuring Your Occupational Dose: Film Badges, TLDs, Bioassays, Film Badge Reports

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Title: Topic 17 Measuring Your Occupational Dose: Film Badges, TLDs, Bioassays, Film Badge Reports


1
Topic 17Measuring Your Occupational Dose Film
Badges, TLDs, Bioassays, Film Badge Reports
2
Written and produced by
Michael A. Thompson, Professor Nuclear Medicine
Technology University of Alabama at
Birmingham
? Board of Trustees, University of Alabama, 1999
3
Dosimetry Techniques
  • Measuring your occupational radiation exposure

4
Measuring Techniques Include
  • Film Badges
  • TLDs
  • Finger Rings
  • Bioassays

5
Who Should Be Monitored??
  • Each licensee shall monitor exposures to
    radiation...and require the use of individual
    monitoring devices by adults likely to receive,
    in 1 year, from external sources, a dose in
    excess of 10 of the limits.
  • (0.1 x 5 rem or 500 mrem)
  • -10CFR20 (1502)

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Who Should Be Monitored?
  • .....declared pregnant women likely to receive,
    in 1 year, from external sources, a dose in
    excess of the applicable limits.
  • (.1 x 0.5 rem or 50 mrem)
  • -10CFR20 (1502)

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Who Should Be Monitored?
  • Individuals entering a high radiation area or
    a very high radiation area.
  • -10CFR20 (1502)

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8
Dose Measuring DevicesFilm Badges
  • most commonly used device
  • used to measure whole body dose
  • operation based on darkening of
    photographic film

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10
To Assure Accurate Readings with Film Badges
  • wear badge at sternum level
  • keep badge away from heat sources
  • store badge away from radiation sources
  • do not wear your badge when having personal
    medical or dental x-rays
  • notify your Radiation Safety Officer (RSO) if
    anything unusual happens to you badge
  • only wear the film badge assigned to you
  • assigned badges should be worn at only one
    institution

11
Dose Measuring Devices Thermoluminescent
Dosimeters (TLDs)
  • uses crystal detector (LiF) rather than film
  • the more radiation absorbed by the crystal, the
    more light emitted from the crystal when heated
  • may be used as a whole body badge or ring badge

12
How am I informed of my radiation exposure?
13
The Film Badge Report
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The Radiation Monitoring Cycle
  • Occupationally
  • Badge/ Exposed Film Badge
  • TLD Individual Report
  • Radiation Radiation
  • Safety Safety
  • Film Badge
  • Badge Report
  • Film badge
  • Company

15
By law, if you are assigned a film badge/TLD
  • You must be allowed to review your film badge at
    least annually (preferably monthly or quarterly)
  • You must be provided a written record of your
    exposure upon termination of your employment

16
  • BIOASSAYS ARE REQUIRED TO MONITOR INTERNAL
    RADIATION DOSE

17
Routes of Internal Contamination
  • open cuts or wounds
  • ingestion
  • inhalation

18
Bioassay Techniques
  • thyroid checks
  • urine assay

19
  • Whenever you have questions regarding
    radiation safety or your radiation exposure
  • Contact your Radiation Safety Officer (RSO)!

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