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RADT465: safety
Radiation physics, radiobiology, and radiation protection
Question | Answer |
---|---|
Are dosimeters personal protection devices? T/F | False |
What is the minimum lead equivalent for a lead apron? | 0.5 mm |
What is the minimum lead equivalent for lead gloves? | 0.25 mm |
What is the minimum lead equivalent for thyroid shields? | 0.5mm |
What is the minimum lead equivalent for lead glasses? | 0.35mm |
What is the minimum lead equivalent for a bucky slot cover? | 0.25mm |
What is the minimum lead equivalent for a clear overhead protective barrier? | 0.5 mm |
What is one drawback about TLD dosimeters? | One time read |
What is the most common type of dosimeter? | OSL |
What is an inexpensive dosimeter that is also sensitive to temperature, being dropped, etc? | Film badge |
What type of dosimeter is meant for short term use? | Pocket ionization chamber |
What is the total filtration required if you are operating below 50 kV? | 0.5 mm |
What is the total filtration required if you are operating at 50-70 kV? | 1.5 mm |
What is the total filtration required if you are operating above 70 kV? | 2.5 mm |
How much filtration do most tubes have? | 2.5 mm |
Roentgen is equal to _____ in SI units | c/kg |
Rads are equal to _____ in SI units | Gy |
Rems are equal to ____ in SI units | Sieverts |
Curies are equal to ____ in SI units | Becquerels |
What is the annual dose for an occupational worker in traditional units? | 5 rem |
What is the dose limit to the eye for an occupational worker in traditional units? | 15 rem |
What is the dose limit for the hands, skin & feet for an occupational worker in traditional units? | 50 rem |
What is the cumulative dose for an occupational worker in traditional units? | 1 x age (rems) |
What is the annual dose for someone in the public in traditional units? | 0.5 rems |
What is the dose limit for the lens of the eye, skin, hands and feet of a public person in traditional units? | 5 rems |
What is the monthly limit for an embryo in traditional units? | 0.05 rems |
What is the dose limit for the entire gestation of an embryo in traditional units? | 0.5 rems |
2000 cGy is = _____ Gy | 2 Gy |
425 mrem is = _____ rem | 0.425 rem |
1500 mSv is = ____ Sv | 1.5 Sv |
125 kV is = _____ V | 125,000 V |
55 MV is = _________ V | 55,000,000 V |
25 Rad is = ______ mrad | 25,000 mrads |
150 Gy is = _____ cGy | 15,000 Gcy |
250 V is = ______ kV | 0.25 kV |
46 V is = ______ MV | 0.000046 |
What is the quality factor for X-rays? | 1 |
What is the quality factor for gamma rays? | 1 |
What is the quality factor for beta particles? | 1 |
What is the quality factor for fast neutrons? | 10 |
What is the quality factor for protons? | 10 |
What is the quality factor for alpha particles? | 20 |
What is the max fluoro exposure rate at tabletop? | 10 R/minute |
What is the mA level is fluoro? | 2-5 mA |
What is the min SSD for a fixed fluoro unit? | 15 in |
What is the min SSD for a mobile fluoro unit? | 12 in |
How often does the cumulative fluoro timer go off? | Every 5 minutes |
A portable x-ray cord must be how long? | 6 ft |
What is the leakage radiation limit? | 100 mR/hr @ 1 m |
What is the tissue weighting factor for bone and skin? | 0.01 |
What is the tissue weighting factor for the thyroid, breast and bladder? | 0.05 |
What is the tissue weighting factor for the red bone marrow, colon, lung and stomach? | 0.12 |
What is the tissue weighting factor for the gonads? | 0.20 |