Radiation exposure & monitoring

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Anonymous
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302820
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Radiation exposure & monitoring
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2015-05-16 19:32:07
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Radiation exposure & monitoring
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  1. <correct.opt style="color: rgb(78, 78, 78); font-family: 'Open Sans'; font-size: 15px; line-height: 22.5px;"> According to the NCRP, the annual occupational whole-body dose-equivalent limit is 50 mSv (5 rem or 5,000 mrem). The annual occupational whole-body dose-equivalent limit for students under the age of 18 years is 1 mSv (100 mrem or 0.1 rem). The annual occupational dose-equivalent limit for the lens of the eye, a particularly radiosensitive organ, is 150 mSv (15 rem). The annual occupational dose-equivalent limit for the thyroidskin, and extremities is 500 mSv (50 rem). The total gestational dose-equivalent limit for the embryo/fetus of a pregnant radiographer is 5 mSv (500 mrem), not to exceed 0.5 mSv in 1 month.(Bushong8th ed.p. 557)
  2. f the exposure rate to a body standing 5 feet from a radiation source is 10 mR/min, what will be the dose to that body at a distance of 8 feet from the source?




     
    25.6 mR/min 



     
    16 mR/min 



     
    6.25 mR/min 



     
    3.9 mR/min
    •  
    •  
    • 3.9 mR/min 
    • The relationship between x-ray intensity and distance from the source is expressed in the inverse square law of radiation. The formula is 
    • Substituting known values,
    • 64 x = 250
    • x = 3.9 mR/min at 8 feet from the source
  3. The dose limit for 1 month during pregnancy is___ mSv (__mrem,___ rem). 
    •  0.5mSv
    • 50 mren
    • 0.05rem
  4. What is the established fetal dose-limit guideline for pregnant radiographers during the entire gestation period?
    •  
    •  
    • 0.5 rem
  5. According to the National Council on Radiation Protection and Measurements (NCRP), the gestational dose-equivalent limit for embryo/fetus of a pregnant radiographer is




     
    1 mSv 



     
    0.5 mSv 



     
    15 mSv 



     
    50 mSv
    •  
    •  
    • 0.5 mSv

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