Fukushima incident causes a lot of fears among people, as to whether it's safe for tourists to go to Japan or not.

While I understand that the radiation is not a problem for normal people, what about a pregnant lady who wants to go to hokkaido ? Will the radiation cause cancer or problem to either the pregnant lady or the baby?

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    there is no normal sense. People have wildly varying levels of acceptable risk, and some persons have different levels of acceptable risk for different hazards. Unless you plan to tour Fukushima Dachi, the radiation riks is almost certainly safer for the pregnant woman (and child) than putting her in a car. For that reason we like people to describe what counts as "safe" to them (or to just ask broadly about the risk level), otherwise the question is unanswerable. – CMaster May 26 '16 at 8:14
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    Even visiting the Fukushima area (outside of the plant itself) is perfectly safe despite whatever the media says. Same goes for Chernobyl - only a very small area is actually dangerous for short-term visitors. – JonathanReez May 26 '16 at 8:23
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    @JonathanReez although it is worth noting that pregnant women are advised to subject themselves to much lower doses than the population at large. Although noones ever done an RCT to determine how much lower, mind. – CMaster May 26 '16 at 8:45
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    Pretty much everything is safer than driving, including commercial flying above a war zone. – Mast May 26 '16 at 9:47
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    This is not primarily opinion-based. This is primarily SCIENCE-based! :) – Andrew Grimm May 27 '16 at 9:53

It's safe. Per both the Japan Radiation Map and Safecast, radiation levels in Hokkaido are safe (green) at less than 0.05 microSieverts (μSv) per hour, or 1.2 μSv/day.

For comparison, if you live in a brick or concrete house you get a dose of about 70 μSv/year, and if you spend 14 hours on a plane, you will get a dose of around 100 μSv from atmospheric radiation.

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    Even in the most elevated areas, you could stay over a month amd still stay under annual does limits - although obviously different for pregnant women. Other than the Fukashima plant site itself, are the elevated levels in Fukushima perfecture a consqeuence of the power plant, or is there just a lot of granite there? – CMaster May 26 '16 at 8:07
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    I expect the levels are a lot lower then Dartmoor (UK) and lots of people are happy to go on holiday to Dartmoor. – Ian Ringrose May 26 '16 at 9:20
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    For another relevant comparison (also from Randall Munroe’s great chard), a typical mammogram is 400µSv — as much as a year in Hokkaido, at the rates reported in above. And there’s plenty of medical advice out there about getting mammograms during pregnancy, generally (as far as I can find) reporting that it’s pretty safe. – PLL May 26 '16 at 13:35

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