Dose trivia Flashcards
cumulative dose level to the lens of the eye for the development of cataracts
2 Gy
posterior pole
annual dose limit to a member of the general public
100 mrem (1mSv)
2 mrem/hr (0.02 mSv/hr)
background annual radiation dose
300 mrem (3 mSv)
total effective occupational dose limi for a radiation worker
5000 mrem
50 mSv
(roughly 15 x the average background radiation dose to a member of the general public)
dose limit to radiation worker’s extremity
500 mSv
50,000 mrem
Mettler Ch 13 pearl
Annual occupational dose limits:
effective dose: __________
the eye:_________
any organ or tissue: __________
Annual occupational dose limits:
effective dose: 5 rem (50mSv)
the eye: 15 rem (150mSv)
any organ or tissue: 50 rem (500 mSv, 0.5 Sv)
Mettler Pearl
public dose limits:
annually: _____________
per hour: ____________
public dose limits:
annually: 0.1 rem (1 mSv)
per hour: 2 mrem per hour (20 uSv per hour)
mettler ch 13 pearl
permitted variation for an administered dose from the prescribed dose
+/- 20%
Mettler Ch 13 pearl
definition of a medical event
A medical event must meet all these criteria:
- effective dose >5 rem (50mSv) OR an tissue/organ absorbed dose > 50 rem (500 mSv) - when you reached your occupational dose limit
- administed dose > 20% from prescribed
- wrong pharmaceutical, wrong route of administration, or wrong patient
rules for release of pt given therapeutic I-131
- PATIENT IS SELF SUFFICIENT:
- amount of administered activity or dose rate is < 33 mCi [1.2 GBq]…
- OR pt dose at 1m measured with an ionization chamber is < 7 mrem per hour
- PATIENT RELIES ON A CAREGIVER:
- caregiver will receive an effective dose < 0.5 rem
annual dose limit to a member of the general public
100 mrem (1mSv)
2 mrem/hr (0.02 mSv/hr)
background annual radiation dose
300 mrem (3 mSv)
total effective occupational dose limi for a radiation worker
5000 mrem
50 mSv
(roughly 15 x the average background radiation dose to a member of the general public)
dose limit to radiation worker’s extremity
500 mSv
50,000 mrem
occupational dose for people < 18 (minors)
10% of the adult values
At what exposures should you call the NRC within 24hrs?
- Total effective dose equivalent 5 rem
- Eye dose equivalent 15 rem
- Shallow dose equivalent 15 rem
At what dose exposure should you notify the NRC within 30 days?
annual limit dose excess of:
- occupational
- public
- embryo/fetal
who gets a film badge?
individuals who receive a radiation dose in excess of 10% of the allowable occupational limits in 1 year
what is the fetal dose limit if a worker does not declare her pregnancy?
there is no fetal dose limit if the pregnancy is not declared
when does a patient receive written radiation safety guidelines
if the total effective dose equivalent to any other individual exceeds 1 mSv
average American dose of radiation per year
6 mSv
3 mSv from background (Radon)
3 mSv from medical
BEIR 7 cancer prediction
1 in 100 will get a solid cancer or leukemia from a does of 100 mSv above background
17 year old receptionist in the nuclear medicine department. Dose limit?
1 mSv (public lmit)
“radiation area” dose limit
0.05 mSv in 1 hr at 30cm
