10CFR20 and Radiation Protection Flashcards
Describe the terms stochastic and non-stochastic and give an example of a 10CFR20 limit for each.
Stochastic - Randomly occurring - probability of the effect occurring varies linearly with dose and has NO THRESHOLD.
i. The annual limit, 5 rem (0.05 Sv) for uniform irradiation of the whole body, is a limit set to reduce the probability of a stochastic health effect
Non-stochastic - Health effects in which the severity of the effect varies with dose, and for which a THRESHOLD is believed to EXIST.
i. The annual limits to the lens of eyes. An eye dose equivalent of 15 rem would be a non- stochastic limit to prevent a health effect (Cataracts).
Describe the Annual Limit on Intake (ALI) and the Derived Air Concentration (DAC), and discuss their relationship.
ALI - The derived limit for the amount of radioactive material taken into the body of an adult worker by inhalation or ingestion in a year.
DAC - The concentration of a given radionuclide in air which, if breathed by the reference man for a working year of 2,000 hours under condition of light work (inhalation rate 1.2 cubic meters of air per hour), results in an intake of one ALI.
5000mRem = 1 ALI = 2000 DAC-hr
what are the cook and 10CFR20 Dose Limits
COOK Federal
annual TEDE 2 Rem/yr 5 Rem/yr
Annual Eye (LDE) 10 Rem/yr 15 Rem/yr
Annual Skin (body) 30 Rem/yr 50 Rem/yr
Decl. Pregnant 400mRem/yr 500 mRem/yr
What are the Dose limits for Operation of the TSC?
Protecting Valuable Equipment -
10 Rem whole body/incident
Protection of Large Population Groups -
<=25 whole body per lifetime
>25 if -on Voluntary Basis
-has full awareness of the risk involved
-ind. signed next to name on dose extension form
Life Saving Actions -
<=25 whole body per lifetime
>25 if -on Voluntary Basis
-has full awareness of the risk involved
-ind. signed next to name on dose extension form
what is a Rad Area (posting required)
that could result in dose equivalent of 5 mRem in 1 hr. at 30cm
what is a High Rad Area (posting required)
that could result in dose equivalent of 100 mRem in 1 hr. at 30cm
what is a Locked High Rad Area (posting required)
that could result in dose equivalent of 1000 mRem in 1 hr. at 30cm
what is a Very High Rad Area (posting required)
GRAVE DANGER
that could result in dose equivalent of 500 Rads in 1 hr. at 1 meter
what is a Contamination Area (posting required)
loose surface contamination may exceed
1000 dpm beta-gama on 100 cm2 smear
OR
20 dpm/100cm2 of alpha
what is a High Contamination Area (posting required)
Area where contamination levels are (or) anticipated to be
> = 100,000 dpm/100cm2
State the major concerns of the Plant ALARA Program
A. All work requiring Radiation Work Permits is reviewed before a job - for opportunities to reduce or minimize dose. this includes Design Change Packages
B. Work is reviewed during and after the Job to document Lessons Learned and suggest improvements to reduce dose.
