The unit rem (roentgen equivalent for man) is the product of the radiation dose
ID: 1053275 • Letter: T
Question
The unit rem (roentgen equivalent for man) is the product of the radiation dose in rads and the relative biological effectiveness (RBE) of radiation The SI unit for effective dosage is the sieved (Sv) and 1 Sv = 100 rem. The table shown here describes the biological effects of short-term radiation on humans The intensity of radiation increases as you move closer to the radiation source according to the equation I_1/I_2 = d_2^2/d_1^2 where d_1 and d_2 are the initial and final distances and I_1 and I_2 are the initial and final intensities At a distance of 41 ft. an ionizing radiation source delivers 6 0 rem of radiation How close could you get to the source and still have no biological effects? Express your answer to two significant figures and include the appropriate units. A nurse administered 4 10 mL of a radioisotope solution that has an activity of 195 mu Ci/mL. What total dose dose of the radioisotope did the patient receive? Express your answer to three significExplanation / Answer
I1 / I2 = d1^2 / d2^2
I1 = 6 rem
I2 = 25 rem [ since no biological effects observed upto this distance ]
d1 = 42 ft
6 / 25 = d2^2 / 42^2
d2 = 20.57 ft
Upto 20.57 ft you can get close with no effects
Part B
195uCi in 1 ml
In 4.1 ml = 799.5 uCi
Dose = 799.5 uCi or 799.5 urem
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