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Problem

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question

The maximum permissible dosage for scientific workers using \Upsilon- radiation is 6.25milliroentgensper hour. What is the safe working distance from a 20-Ci source of cobalt-60 which has a dose rate of 27 roentgens (R) per hour at a distance of lm? If the source is used in a lead container which reduces the \Upsilon-radiation emitted to 1%, how much closer can the scientists work?

category

physics

options

  1. 80 m and 8 m
  2. 85 m and 8.5 m
  3. 90 m and 9 m
  4. 60 m and 5.7 m
  5. 55 m and 5.5 m
  6. 70 m and 7 m
  7. 65.7 m and 6.57 m
  8. 72 m and 7.2 m
  9. 50 m and 5 m
  10. 75 m and 7.5 m

src

stemez-Physics

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