My father was treated for prostate cancer with internal radation pellets. I don't know the time between the 'treatment' and his death, could be anything from 1

My father was treated for prostate cancer with internal radation pellets. I don't know the time between the 'treatment' and his death, could be anything from 12 - 24 months. I know at least one of the pellets had started 'wandering'. He died of acute leukemia and I suspect that had to do with the radation. However, I am not pursuing research into this, it won't bring him back. He was 63 years old.