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Tokyo now features "hot spots" of significant radiation. Sewage slag containing "170,000 Bequerels/kilogram" radioactivity has been detected and recycled into building materials! Soil in Koto Ward of Tokyo measured "2,300 Bq/kg."
A report by Bloomberg tells of soil samples about 25 kilometers to the northwest of the Fukushima plant, "with radiation from Cesium-137 exceeding 5 million becquerels per square meter." Other test sites 30km from the plant, "showed radiation exceeding 1.48 million becquerels per square meter."The radiation has already spread out over great distances. Japanese green tea containing "1,000 Bq/kg" radiation was found and seized by customs in Paris, France....The tea was shipped from Shizuoka Prefecture in central Japan, which should raise even more concern, being quite a bit southwest of Tokyo.
Let's put this into perspective.
Quote
In the International System of units (SI), the becquerel (Bq) is the unit of radioactivity. One Bq is 1 disintegration per second (dps). One curie is 37 billion Bq. Since the Bq represents such a small amount, you are likely to see a prefix used with Bq, as shown below:
A radiotherapy machine may have roughly 1000 Ci of a radioisotope such as caesium-137 or cobalt-60. This quantity of radioactivity can produce serious health effects with only a few minutes of close-range, un-shielded exposure.
So, a radiation machine with 1000 Ci is the equivalent of 37 TBq, which is Bq times 10 to the 12th power.
Now, let's divide the 1.48 million Bq/ meter squared by the 37 TBq. The result is 0.00000004 Ci per meter squared. That is about 1/25,000,000,000 of the dosage derived from one radiotherapy machine. And that is spread out over a square meter (ten square feet or so).
If all else fails RTFM.
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