Same old rubbish 25 years on
It's pleasing to note that the people of Japan don't have a large scale nuclear accident to deal with on top of the catastrophic tsusami, however -
"The maximum potential radiation dose received by any ship's force personnel aboard the ship when it passed through the area was less than the radiation exposure received from about one month of exposure to natural background radiation from sources such as rocks, soil, and the sun."
Why do they always spout such rubbish? You may as well say "a soldier operating in Helmand Province was briefly exposed to the same degree of cranial pressure as is exerted by wearing a hat for a year" (in other words he took a 7.62 to the head and died). It's *exactly* the lies they told the poor souls they sent into Chernobyl post-explosion - "oh you'll be fine as long as you're not in there for any longer than 30mins; that's your lifetime limit". Doesn't really work like that does it?
I'm not saying those sailors are at immediate risk of a very nasty death, but it's not exactly comforting to see our own officials spouting the same rubbish that the Ruskies did 25 years ago. The same rubbish that killed hundreds of workers.
Just be honest with folk - they were exposed to 30-60x the usual dose for a period of 12-24 hours. I know - that doesn't sound quite as cuddly as "from sources such as rocks, soil, and the sun".