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Which of the following brachytherapy radioisoptopes has the greatest HVL? 60Co (average energy 1.25 MeV) 226Ra (average energy 0.83 MeV) 137Cs (average energy 0.662 MeV)

Which of the following brachytherapy radioisoptopes has the greatest HVL? 60Co (average energy 1.25 MeV) 226Ra (average energy 0.83 MeV) 137Cs (average energy 0.662 MeV) 198Au (average energy 0.42 MeV) 125I (average energy 0.028 MeV) Group of answer choices 137Cs (average energy 0.662 MeV) 60Co (average energy 1.25 MeV) 198Au (average energy 0.42 MeV) 226Ra (average energy 0.83 MeV) 125I (average energy 0.028 MeV)

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