[ RadSafe ] observations on iodized salt

[Hoffman, Daniel E]

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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