[ RadSafe ] observations on iodized salt

[radbloom at comcast.net]

Which is to say that if you count table salt - NaCl with I - you will get lower results than if you count the substitute salt, KI.  That's because it's the potassium, with includes K-40 (as well as larger amounts of non-radioactive (stable) K-39 and K-41), which is radioactive.  The iodine (I-127) is stable. 


Cindy Bloom 



----- Original Message ----- 
From: "Daniel E Hoffman" <Daniel.Hoffman at covidien.com> 
To: "The International Radiation Protection (Health Physics) MailingList" <radsafe at health.phys.iit.edu> 
Sent: Thursday, March 24, 2011 10:09:08 AM 
Subject: Re: [ RadSafe ] observations on iodized salt 

John -- That would be K-40. 

Dan Hoffman 

-----Original Message----- 
From: radsafe-bounces at health.phys.iit.edu 
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of John R Johnson 
Sent: Thursday, March 24, 2011 8:46 AM 
To: The International Radiation Protection (Health Physics) Mailing List 
Subject: Re: [ RadSafe ] observations on iodized salt 

John et al 

We need to remember that potassium in a neccessary element and it 
contains 
naturally occuring P-40 which has a 1.46 MeV gamma ray. 

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: "Scott Davidson" <bsdnuke at gmail.com> 
To: "The International Radiation Protection (Health Physics) Mailing 
List" 
<radsafe at health.phys.iit.edu> 
Sent: Thursday, March 24, 2011 6:24 AM 
Subject: Re: [ RadSafe ] observations on iodized salt 


I would suspect not, the likely culprit would be the potassium-40 
which has an extremely long half life. 

On Thu, Mar 24, 2011 at 9:05 AM, John Gerald Center, Jr 
<john.center at wmich.edu> wrote: 
> We use a Ludlum model 14C and a pancake probe with the 0.1 scale 
> calibrated to cpm. We would take a couple of tablespoons of Morton 
Lite 
> Salt, a mixture of iodized salt and potassium chloride, and count it 
> during radiation safety training classes. Background was less than 
1000 
> cpm, a newly opened package of this salt would peg the meter on the 
0.1 
> scale. Older, opened containers (2 years) still near max reading (6000 

> cpm). I used it none the less. I have never tried to count plain 
iodized 
> salt. Would I get different results? 
> 
> 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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