“We joked about it: ‘Hey, it’s radioactive snow!’ ” Cooper recalled. “I took pictures and video.”

But now “my thyroid is so out of whack that I can lose 60 to 70 pounds in one month and then gain it back the next,” said Cooper, fighting tears. “My menstrual cycle lasts for six months at a time, and I cannot get pregnant. It’s ruined me.”

The fallout of those four days spent off the Fukushima coast has been tragic to many of the 5,000 sailors who were there.

At least 70 have been stricken with some form of radiation sickness, and of those, “at least half . . . are suffering from some form of cancer,” their lawyer, Paul Garner, told The Post Saturday.