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

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

• Measuring your occupational radiation exposure

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Measuring Techniques Include

• Film Badges
• TLDs
• Finger Rings
• Bioassays

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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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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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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

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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

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How am I informed of my radiation exposure?
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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

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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

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• BIOASSAYS ARE REQUIRED TO MONITOR INTERNAL
  RADIATION DOSE

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Routes of Internal Contamination

• open cuts or wounds
• ingestion
• inhalation

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Bioassay Techniques

• thyroid checks
• urine assay

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

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