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Unformatted text preview: Thumb" c. Are the most accurate and reliable means of determining exposure levels d. Will be very reliable following a nuclear detonation since they usually use AC line current 39. According to the "7:10 Rule of Thumb," if the exposure rate one hour after detonation of a nuclear weapon is 500 R/hr, the exposure rate approximately 14 days later (343 hours) will be approximately: a. 50 R/hr b. 5 R/hr c. 0.5 R/hr d. 0.05 R/hr 40. The 7:10 Rule of Thumb: a. Is 100 percent accurate b. Helps estimate future exposure levels c. Is more reliable than radiological survey instrument readings d. Is accurate to within +10 percent...
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- Spring '10