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Mudassir Ali

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Approximately 2 weeks and that’s based on a 7-10 formula…

For purpose of conversion, if at the point of detonation the radiation readings were 1,000, for every multiple of 7, the radiation levels decrease by a multiple of 10. So 7 hours later the readings are going to be 100. Seven times seven comes out to two days where the readings will be 10. And 7 times 2 days will be 2 weeks and the radiation level will drop to 1.

Keep in mind this doesn’t take into fact the conditions of time, distance and mass or other factors; however, it does show why you’ll be in a shelter for about 2 weeks.