January 2019 NY Regents Chemistry Exam
30 Which phrase describes a risk of using the radioisotope Co-60 in treating cancer?
(1) production of acid rain
(2) production of greenhouse gases
(3) increased biological exposure
(4) increased ozone depletion
Solution: Co-60 decays by gamma decay. Therefore the risk of using it is increased biological exposure which can cause skin burns, acute radiation sickness, or death.
Answer: 3
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