# Protection final

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1. what is the inverse square law?
"The intensity of radiation is inversely proportional to the square of the distance from the source"
2. 17 year old dose limits
.1rem
3. General public(freq. exp) dose limit
.1rem
4. Whole body occupational dose limit
5rem
5. Occupational lense of eye dose limit
15rem
6. Embryo/fetus dose limit
.5 rem
7. General public(infreq. Exp.) dose limit
.5 rem
8. 19 year old radiography student dose limit
5 rem
9. How do you convert rem to miliseverts?
Rem x 10=mSv
10. Hands, occupational worker, dose limit
50 rem
11. Skin dose limit
50 rem
12. Thyroid dose limit
50 rem
13. Tissue/organs
50 rem
14. dose limit for a declared pregnant worker per month
.05 rem
15. LD 50/60 dose limit
480 rem
16. Temporary sterility dose limit
200 rem
18. Chromosome aberration dose limit
5 rem
19. Hematologic depression dose limit
25 rem
20. Cataracts (acute) dose limit
200 rem
21. Cataracts(chromic) dose limit
1000 rem
22. Death of all humans (no tx.) dose limit
600 rem
23. Death of all humans (w/tax.) dose limit
1000 rem
10 rem
25. Erythema dose limit
200 rem
26. Epilation dose limit
300 rem
27. 8 week abortion dose limit
20 rem
28. 0-9 days (death) dose limit
15 rem
29. Minimum DE dose limit
200 rem
30. LD 50/30 dose limit
300 rem
31. _______ is the most effective means of protection from ionizing radiation.
Distance
32. The inverse square law expresses the relationship between ______ and _________  of radiation and governs the dose received.
• Distance
• intensity(quantity)
33. As the distance between the source of radiation and any given measurement point _______, radiation intensity(quantity)  measurement at that point _________ by the a square of the relative change in distance between the new location and the old.
• Increases
• decreases
34. When the distance from a point source of radiation is, the radiation at the new location spans an area _______ times larger than the original area. Hodensity the intensity at the new distance is only 1/__ of the original intensity
• 4
• 1/4
• (distance x3=1/9 of the intensity of the beam)
• (distance x4= 1/16 of the intensity)
35. The amount of radiation a worker receives is _____ proportional to the length of time for which the individual is exposed to ionizing radiation.
Directly
36. Required thickness of an apron
.25 mm
37. Required thickness of a thyroid shield
.5mm
38. Primary barrier thickness
1/16mm
39. Secondary barrier thickess
1/32 mm