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Dosimetry and Personal Exposure Assessment Flashcards

6 cards from real RSO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A thermoluminescent dosimeter (TLD) measures radiation exposure by:

    Answer: Storing energy in crystal lattice defects released as light when heated

    TLDs work by trapping radiation-induced electrons in crystal lattice defects; when heated, trapped electrons release their stored energy as measurable light proportional to dose.

  2. The NRC annual occupational whole-body dose limit (TEDE) for radiation workers is:

    Answer: 50 mSv (5 rem)

    10 CFR 20.1201 establishes the annual occupational total effective dose equivalent (TEDE) limit at 50 mSv (5 rem) for adults working with radiation.

  3. An optically stimulated luminescence (OSL) dosimeter differs from a TLD primarily because it:

    Answer: Releases stored dose information using light rather than heat

    OSL dosimeters use laser light rather than heat to stimulate the release of trapped electrons, which then emit light proportional to the accumulated dose.

  4. When should a radiation worker wear their dosimeter at the collar level rather than at the waist?

    Answer: When wearing a lead apron in fluoroscopy or other high-dose-rate x-ray environments

    During fluoroscopy with a lead apron, a collar badge worn outside the apron monitors the unshielded head and neck dose; a second badge under the apron may estimate effective dose.

  5. A deep dose equivalent (DDE) reported on a dosimeter badge refers to dose at a tissue depth of:

    Answer: 1.0 cm for deep tissue/organs

    Deep dose equivalent is the dose equivalent at 1 cm depth in tissue, representing dose to deep organs and used in calculating TEDE for external radiation.

  6. A Geiger-Müller (GM) survey meter is best suited for:

    Answer: Detecting the presence of low-level beta/gamma contamination

    GM detectors are extremely sensitive and ideal for detecting contamination and low-level beta/gamma radiation, though they can 'dead-time' saturate at high dose rates.