[ RadSafe ] observations on iodized salt

[John R Johnson]

Cindy and John

ICRP Publication 71, Section 5.19 is used in Canada.

John
***************
John R Johnson, PhD
CEO, IDIAS, Inc.
4535 West 9th Ave
Vancouver, B. C.
V6R 2E2, Canada
idias at interchange.ubc.ca


----- Original Message ----- 
From: <radbloom at comcast.net>
To: "The International Radiation Protection (Health Physics) Mailing List" 
<radsafe at health.phys.iit.edu>
Sent: Thursday, March 24, 2011 8:14 AM
Subject: Re: [ RadSafe ] observations on iodized salt


>
>
> John,
>
> I'm also still not sure what you are asking. :-) In regards to the iodine 
> in iodized table salt or salt substitute, there is no radioactive iodine 
> in these substances. If you are asking about radioactive iodine in 
> air/food/water, then you can look at the ICRP models. Industry typically 
> uses ICRP Publication 30, which have been updated in Publications 60-72 
> (depending on what exactly you are looking for). I believe there are more 
> recent updates, but I'm not sure if these provide any significant change 
> to the iodine metabolic modeling.
>
>
>
> In considering radioiodine damage to the thyroid, I personally think about 
> radiation therapy, where the goal is to reduce [over-active] thyroid 
> function (an [acute] oral intake of about 10 millicuries [3.7 e7 Bq]) or 
> to destroy cancer in thyroid tissue, which also stops thyroid function (an 
> [acute] oral intake of about 100 mCi [3.7 e8 Bq]). In ICRP 30, it is 
> assumed that 30% of the iodine is absorbed by thyroid tissue and the rest 
> is excreted. In these large dosages, there is sufficient energy absorption 
> within a sufficient number of thyroid cells to cause dysfunction of the 
> organ.
>
>
>
> Still not sure if this is what you are looking for. You might do a search 
> on "iodine metabolism". You can also look at ALIs and DACs published by 
> the EPA and NRC.
>
>
>
> Cindy
> ----- Original Message ----- 
> From: "John Gerald Center, Jr" <john.center at wmich.edu>
> To: "The International Radiation Protection (Health Physics) Mailing List" 
> <radsafe at agni.phys.iit.edu>
> Sent: Thursday, March 24, 2011 10:27:13 AM
> Subject: Re: [ RadSafe ] observations on iodized salt
>
> I think I didn't start out right. And I am still not sure what I am 
> asking. I and many others voluntarily take in radioactive food sources. 
> Beta and gamma emmiters with greater half lives than Iodine. The concern 
> is the thyroid with iodine if I am not mistaken. Does anyone have a 
> resource I can look to,to see specifically how Iodine is absorbed and the 
> damage it does? John
>
> John G. Center, Jr.
> Radiation Safety Officer
> 3922 Wood Hall
> Western Michigan University
> 1903 W. Michigan Ave.
> Kalamazoo, MI 49008-5410
>
> Office (269) 387-5933
> Cell (269) 744-0996
> E-mail: john.center at wmich.edu
>
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