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← ScienceWhich risk increases within a radiotherapy treatment room because of cobalt-60 decay?
A)Increased gamma photon contamination✓
B)Neutron emission spectrum instability
C)Auger electron acceleration increase
D)Positron annihilation event shift
💡 Explanation
The cobalt-60 source undergoes beta decay to nickel-60, which then emits dangerous gamma photons. Shielding efficacy against the original source decreases because decay products introduce additional gamma radiation, therefore A occurs, rather than altered particle emissions.
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