rad bio ch 39-40 for final
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each of the black spaces below before clicking
on it to display the answer.
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| ESE | entrance skin dose, patient dose measured with a TLD
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| how accurate is a TLD? | within +/- 5%
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| what is the average ESE for flouro? | 4 R/min
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| MMD | mean marrow dose, measures average dose to entire active bone marrow
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| MMD average in the US populations | 100 mrad/yr
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| GSD | gentically significant dose, gonad dose.
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| term for the dose which if recieved by the entire population would produce total genetic effects | GSD
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| GSD for diagnostic x-rays | 20 mrad/yr
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| ESE for mammo | 800 mR per view
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| glandular dose (Dg) | dose recieved to breast tissue in mammo, 15% of ESE
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| full body scan yields how many rad? | 4,000 to 6,000 mrad
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| name the 6 ways to reduce pt dose | minimize unnecessary exams, no repeats, use high kV and low mA, use a fast IR, proper positioning, shield
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| period of major organigenesis for enbryo | wk 2-10
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| early effects for embryo weeks 2-10 | skeletal
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| late effects for embryo weeks 2-10 | neurologic
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| if a response occurs during 2nd and 3rd trimester, what response is most likely? | childhood malignancy
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| whats steps must be taken if am exposure is made on a pregnant woman? | estimate fetal dose, determine gestation stage, consider termination, consider 10-25 rad rule
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| MPD | maximum permissabe dose, small risk
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| how do we calculate cumulative lifetime exposure? | 10 MSV X age or 1000 mrem X age
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| occupational dose limit for the lens of the eye | 150 mSV or 15 rem
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| occupational dose limit annual effective dose | 50 mSV or 5000mrem
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| occupational dose limit thyroid, skin, feet | 500 mSV or 50 rem
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| litmus test | anyone at risk of recieving 1/10 of the DL (500rem) will be given a dosimiter
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| whole body dose limit for public or student under 18 years | 1mSV or 100 mrem
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| lens of eye dose limit for public or student under 18 years | 15 mSV or 1500 mrem
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| whole body dose limit for public infrequent exposure | 500 mrem
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| skin dose dose limit for public or student under 18 years | 50 mSV or 500 mrem
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| embryo or fetal exposure dose limit for gestational period | 5 mSV or 500 mrem
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| embryo or fetal exposure dose limit per month | .5 mSV or 50 mrem
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| formula for exposure | rate X time ex. 250mR/hr X 2.5 min
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| film badge - accuracy and time limits | under 10mrem, 1 month
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| TLD - accuracy and time limits | to 5mrem, up to 2 years
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| OSL - accuracy and time limits | to 1mrem, up to 2 years
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| effective DL for RT | 50 mSV
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| background raditation = | 1 mSV or 100 mrem/yr
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