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ARRT Nuclear Medicine Boards (Math and Stats) Questions and Answers | Already passed | Latest Update

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The radiation intensity from a point source of 99mTc is 9 mR/hr at 3 m from the source. If the distance is changed to 9 m, what is the new radiation intensity? A. 0.5 mR/hr B. 1.0 mR/hr C. 2.0 mR/hr D. 3.0 mR/hr : B. 1.0 mR/hr The inverse square law results in the radiation intensity quadrupling if the distance from the source is halved, or it results in the radiation intensity decreasing to one fourth of its value if the distance is doubled. A technologist is sitting near a bone mineral densitometer, which is a point source of x-rays. If the xray intensity at 1 m from the x-ray beam is 0.20 mR/hr, to what distance from the x-ray beam should 2 the technologist move to decrease total weekly exposure to the occupational limit of 2 mR for a 40- hour workweek? A. 0.5 m B. 1.5 m C. 2.0 m D. 2.5 m : C. 2.0 m

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