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Cake day: July 8th, 2026

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  • Please forgive me if there’s a joke flying over my head (happens a lot!), but that doesn’t seem right. A sievert is a unit of statistical risk, so it changes the odds of cancer, but short of extreme doses, it’s statistical. Both the total dose, and the rate in Sv/year matters, with higher rates being worse.

    A little over a year on the ISS will get you around 0.1 Sv, but the cancer risk of that is still extremely low. Lots of people have done far more than 1 yr in space, and they aren’t dropping like flies. If 0.1 Sv was a major cancer risk, the DOE limit would be far less than 0.05 Sv/yr.

    Also it would imply more than half the people who used these machines one time would’ve had a causal, not an incidental, cancer, since the short time window of the unit is the worst case way to get the exposure.