[ RadSafe ] Sv (and rems) are NOT restricted to stochastic effects
radbloom at comcast.net
Wed Nov 29 12:53:08 CST 2006
ICRP 60 section 2 provides information on the use of radiation weighting
factors. Also paragraph 17 of ICRP 30 indicates Q is for delayed
stochastic effects. Maybe I'm missing an important reference?
At 12:21 PM 11/29/2006 -0600, Douglas Simpkin wrote:
>Perhaps it's the neurons misfiring, but I'm confused.
>In the discussion of the past couple of weeks on the Po-210 poisoning, a
>number of folks have indicated that the Quality Factor (QF) or radiation
>weighting factor for alphas should not be considered when stating the
>magnitude of deterministic effects. Rather, they presume the QF is
>restricted to describing stochastic effects.
>This is absolutely wrong.
>The QF is based on radiobiological experiments of cell killing effects,
>and you can't get much more deterministic than that! The QF for alphas is
>20 because the alphas dump so much more energy across the cell nucleus,
>and therefore cause that much more deterministic biological damage
>compared to sparsely ionizing x rays.
>Indeed, the effective dose, or effective dose equivalent, (also
>confusingly in Sv or rem) is defined only for stochastic effects. But
>that's not the concern here.
>My rough estimate of 0.12 ug = 0.53 mCi (the amount of Po-210 stated by
>that great repository of societal wisdom, Wikipedia, as lethal) uniformly
>spread through the liver yields a liver dose in the 1000-2000 rad range,
>or 20,000 to 40,000 rem to the liver.
>Enough to mess up anyone's day.
>ps. And no, I'm not apologizing for non-SI units!
>You are currently subscribed to the RadSafe mailing list
>Before posting a message to RadSafe be sure to have read and understood
>the RadSafe rules. These can be found at:
>For information on how to subscribe or unsubscribe and other settings
More information about the RadSafe