Thursday, December 15, 2005

Born to be Wild

... explode into space ...

Sunday, December 11, 2005

Map of danger or hormetic salvation?

This map shows how much thyroid you received based on where you lived as a child during abovegroung atomic testing.

"for purposes of practical radiation protection in humans, most experts agree (including FEMA Emergency Management Institute) that Roentgen, Rad and Rem can all be considered equivalent."
1 millisievert (mSv) = 100 millirem (mrem)
10 millisievert (mSv) = 1 rem (rem)
40 000 mSv = 4000 rem (rem)

screening effect
"We endeavored to save Polish children from developing thyroid cancers by protecting them from a radiation dose of 50 mSv to the thyroid gland [7]. At this dose ICRP recommended implementation of stable iodine prophylaxis. But in studies of more than 34 000 Swedish patients whose thyroid glands received radiation doses reaching up to 40 000 mSv from iodine-131, there was no statistically significant increase in thyroid cancers in adults or children, who had not already been thought to have cancer before treatment with iodine-131. In fact, an opposite effect was observed: there was a 38% decrease in thyroid cancer incidence as compared with the non-irradiated population"


What Becomes of Nuclear Risk Assessment in Light of Radiation Hormesis?
CDC iodine/physiologic_effects
Third, the dose-response curve is linear for persons exposed before 15 years of age (even down to 0.1 Gy [10 rad]). The excess relative risk per unit of exposure (ERR/Gy) for childhood exposure is 7.7 (95% confidence interval, 2.1-28.7).
The Hanford Thyroid Disease Study found no dose-response relationship.
150 million curies of iodine-131 released from the tests resulted in a cumulative average thyroid dose to the population of 2 rad.2 Children were particularly affected: their doses averaged 6 to 14 rad, with some doses as high as 112 rad. Prior to this study, the most recent estimates of children's thyroid doses from iodine-131 in fallout, reported to Congress in 1959 and cited as recently as 1997, gave a dose range for children of 0.2 to 0.4 rad -- 15 to 70 times less than the NCI dose estimates.3
Google thyroid+iodine+131+hormesis