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24 Cards in this Set
- Front
- Back
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TLD
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electons trapped in high-energy imperfections in crystal
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electrons released by application of
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heat (visible light released)
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most common solid used for TLD's
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LiF (z= 8.3) similar to tissue
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device used to measure xray tube output
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ionization chamber
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disadvantage of ionization chamber
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not very sensitive
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advantage of Geiger counter
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very sensitive to small amounts of radiation
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disadvantage of Geiger counter
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not accurate and not specific
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typical xray tube output
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0.1 mGy/mAs
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effective dose limit
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20 mSv/year averaged over 5 years
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whole body dose limit for general public
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1 mSv/year
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monthly limit for pregnant worker
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0.5 mSv
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dose to fetus
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half skin dose
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dose limit to eye lens
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150 mSv/year
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dose limit to skin
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500 mSv/year
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dose limits to members of public
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10% of workers
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leakage radiation
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< 1 mGy/hour at 1 m
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typical entrance skin air kerma in fluro
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30 mGy/minute
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legal limit for entrance air kerma
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100 mGy/minute
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background radiation
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1 mSv per year
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radon is a(n) ___ emitter
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alpha
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diagnostic medical imaging
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most of the US population dose and exceeds doses from all sources of natural background radiation
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ionization chamber measures
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charge
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major difference for Geiger counters
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high voltage
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intensity of scatter at 1 m
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0.1% of patient skin dose
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