Dose Limits Section PPT Flashcards
When is the embryo most sensitive to radiation during pregnancy?
The first trimester is when the embryo is the most sensitive.
What is the maximum dosage to the fetus during the entire pregnancy?
Dosage to fetus must be 5mSv or less during the entire pregnancy.
Where should a second radiation monitoring device be worn for pregnant workers?
A second radiation monitoring device is worn at the waist level.
What organization sets dose limits for radiation?
The National Council on Radiation Protection and Measurements (NRCP).
What are the two categories of dose limits?
Public and Occupational.
What is the formula for effective dose (E)?
E = W_r x W_t x Gy.
What do the variables in the effective dose formula represent?
W_t is the tissue weighting factor, W_r is the radiation weighting factor, and Gy is the absorbed dose.
What is the basis for dose limits?
Dose limits are based on a linear, non-threshold dose-response relationship.
What is the annual whole body dose limit for occupational exposure?
50 mSv/yr (5 rem/yr)
What is the annual dose limit for a pregnant worker?
5 mSv total (0.5 rem total)
What is the annual dose limit for the general public?
1 mSv/yr (0.1 rem/wk)
What is the monthly dose limit for a pregnant worker?
0.5 mSv/mo (0.05 rem/mo)
What is the annual dose limit for the lens of the eye?
150 mSv/yr (15 rem/yr)
What is the annual dose limit for other organs?
500 mSv/yr (50 rem/yr)
What is the annual dose limit for skin?
500 mSv/yr (50 rem/yr)
What is the annual dose limit for extremities?
500 mSv/yr (50 rem/yr)
What is the annual dose limit for the public with infrequent exposure?
5 mSv/yr (0.05 rem/yr)
What is the annual dose limit for the public with frequent (continuous) exposure?
1 mSv/yr (0.01 rem/yr)
What is the dose limit for student radiation workers under 18?
1 Sv/yr (0.1 rem/yr)
What is the formula for calculating cumulative occupational effective dose limits?
10mSv x age
