News this week out of Japan that workers at the crippled Fukushima Daiichi nuclear plant have detected extremely high levels of radiation in and around reactor 1. The first incident, on August 1, pinned the Geiger counter at 10 sieverts (1000 rem)—yes, that’s as high as the device could measure, so that number is a minimum—and was taken at the base of a ventilation stack. The second reading, the following day, clocked in at five sieverts per hour inside the reactor building.
I have yet to read an explanation for the discovery of the second reading, but the initial, sky-high measurement on Monday has me and many others scratching heads. A thousand rem is not some little ho-hum number. A half-hour of exposure at that level is fatal in a matter of days, I am told. Where did that radiation come from?


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