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13. Suppose that a person who has one hand in a uniform beam of x rays receives a dose of 90 millirem (mrem) in 30 s. This per- son now puts both hands side by side in the beam for 30 s. Assuming that the beam is wide enough to cover both hands equally, the radiation dose she will now receive is A. 180mrem, since twice the number of atoms will be exposed. B. 90 mrem, since the number of exposed atoms per gram is unchanged. C. 45 mrem, since the radiation is spread over twice as much of her body.

13. Suppose that a person who has one hand in a uniform beam of x rays receives a dose of 90 millirem (mrem) in 30 s. This per- son now puts both hands side by side in the beam for 30 s. Assuming that the beam is wide enough to cover both hands equally, the radiation dose she will now receive is A. 180mrem, since twice the number of atoms will be exposed. B. 90 mrem, since the number of exposed atoms per gram is unchanged. C. 45 mrem, since the radiation is spread over twice as much of her body.

Phlebotomy Essentials
Phlebotomy Essentials
6th Edition
ISBN:9781451194524
Author:Ruth McCall, Cathee M. Tankersley MT(ASCP)
Publisher:Ruth McCall, Cathee M. Tankersley MT(ASCP)
Chapter1: Phlebotomy: Past And Present And The Healthcare Setting
Section: Chapter Questions
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13. Suppose that a person who has one hand in a uniform beam of x rays receives a dose of 90 millirem (mrem) in 30 s. This per- son now puts both hands side by side in the beam for 30 s. Assuming that the beam is wide enough to cover both hands equally, the radiation dose she will now receive is A. 180 mrem, since twice the number of atoms will be exposed. B. 90 mrem, since the number of exposed atoms per gram is unchanged. C. 45 mrem, since the radiation is spread over twice as much of her body.
Transcribed Image Text:13. Suppose that a person who has one hand in a uniform beam of x rays receives a dose of 90 millirem (mrem) in 30 s. This per- son now puts both hands side by side in the beam for 30 s. Assuming that the beam is wide enough to cover both hands equally, the radiation dose she will now receive is A. 180 mrem, since twice the number of atoms will be exposed. B. 90 mrem, since the number of exposed atoms per gram is unchanged. C. 45 mrem, since the radiation is spread over twice as much of her body.
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