High thyroid radiation doses in 178 Fukushima workers
[link to ajw.asahi.com]

[snip]

Tests on workers suspected of having high whole-body internal doses found 178 individuals whose thyroid glands displayed doses greater than 100 millisieverts, the generally accepted threshold for a raised risk of thyroid cancer.

The highest recorded dose was 11,800 millisieverts, a level that would give a correspondingly high probability of thyroid cancer.

TEPCO identified the individual whose thyroid gland received 11,800 millisieverts as being between 30 and 39 years old. It said the worker had developed no ill-health effects and remains employed, albeit in a non-nuclear job.

The individual's whole-body external and internal radiation dose was 678.8 millisieverts, the highest of all workers tested.