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Dose Limits.docx....Dose Limits.docx
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Average annual BACKGROUND radiation - correct answer .1rem 100mrem 1mSv FETUS Monthly Total Dose Equivalent - correct answer 0.05 rem 5mSv, 50mrem, 5mSv GENERAL PUBLIC frequent EXPOSURE annual - correct answer .1rem 100mrem 1mSv BRACHY RESIDENT WHOLE BODY Annual - correct answer 5rem 5000mrem 50mSv ANNUAL MAX DOSE GENERAL PUBLIC infrequent INFREQUENT - correct answer .5rem 500mrem
50mSv ???Occupational skin, hands feet annual - correct answer 50.0rem 50,000mrem 500mSv GENERAL PUBLIC ANNUAL EFFECTIVE DOSE CONTINUOUS EXPOSURE WHOLE BODY - correct answer 0.1rem 1.0mSv GENERAL PUBLIC EQUIVALENT DOSE LIMIT LENS - correct answer 1.5 rem 15mSv NID Negligible Individual Dose - correct answer .1rem 0.01mSv annually with no corresponding risk level replaces Negligible individual risk level radium source leak What to do? - correct answer 1. remove involved individual
Shielding Uncontrolled - correct answer 0.01rem/wk Radiation protection concerned with: - correct answer primary scatter leakage Primary Barrier Secondary Barrier - correct answer primary radiation scatter and leakage Barrier thickness factors - correct answer W, U, T, d W, Workload - correct answer for MV, weekly dose delivered at 1m from the source (rad/wk at 1m) U, Use Factor - correct answer fraction of time per week that radiation is directed toward a particular barrier T, Occupancy Factor - correct answer fraction of time per week that the area is occupied by the individual d, Distance - correct answer meters from the source to the area to be protected Use Factors: Floor Walls Ceiling - correct answer 1 1/ 1/4-1/2 depending on equipment and techniques
Occupancy Factors Full Partial Occasional - correct answer 1, work areas, offices 1/4, hallways, bathrooms 1/8-1/6, waiting rooms, stairways, elevators, outside areas Transmission factor for the Barrier, B =? - correct answer (P x d^2)/ WUT P = maximum permissible dose equivalent function of a maze - correct answer prevent primary radiation incident on door only scatter to door Neutron contamination and shielding - correct answer 1. >10MV
Shielding Controlled - correct answer .1rem ANNUAL MAX DOSE GENERAL PUBLIC infrequent INFREQUENT - correct answer 0.5 rem BRACHY RESIDENT WHOLE BODY Annual GENERAL PUBLIC EQUIVALENT DOSE LIMIT skin, extremities annual Occupational Effective Dose Equivalent Annual - correct answer 5rem Occupational Lens Annual - correct answer 15rem
Monthly Total Dose Equivalent - correct answer .05rem GENERAL PUBLIC EQUIVALENT DOSE LIMIT LENS, - correct answer 1.5rem
