[ RadSafe ] Re: Hormetic effectiveness

[Eric D]

I do not know about the preferential direction of radiation to an organ.  I
do think it is a good idea to do a complete assessment of risk where the
benefits of the exposure are also included in the assessment.  

As we get to lower and lower levels of acceptable dose for chemicals and
radiation, we are going to approach the point where a toxic substance may
turn into a beneficial substance.  Iron is toxic until the dose is reduced
to the point that it becomes a vitamin.

It would be odd indeed if we regulated these materials below the beneficial
point to where the lack of the dose (radiation or chemical) caused
measurable harm like say iron deficiency.

Eric Daxon

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf
Of jjcohen at prodigy.net
Sent: Tuesday, February 20, 2007 4:58 PM
To: radsafe at radlab.nl
Subject: [ RadSafe ] Re: Hormetic effectiveness

 The ICRP concept of effective dose involves consideration that the harmful
effects of radiation are dependent upon the organs and tissues receiving the
dose, with an "effectiveness factor" assigned to gonads, lungs, etc. Maybe I
am looking too far into the future, to the time when hormesis becomes a
generally accepted concept, but it occurs to me that any beneficial effects
of radiation might also be tissue dependent such that  a prophylactic
radiation program might need to consider whether whole body irradiation for
hormetic purposes might be improved by preferentially directing the
radiation to certain areas of the body. Any thoughts???

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