Yes, and the stress of being uprooted. There was a large surplus of deaths in the evacuated population over the next year, without any sign of a radiogenic disease. Communities being scattered suddenly, the stress of losing homes and homeland.
Do you have any reliable statistics showing that there were surplus deaths? Most of the research I've read showed ~1,500 deaths - mostly among aged 75+ people - over 6 months out of a cohort of 300,000 people. This is not a surplus over normal death rates.