[ RadSafe ] How Would You Advise this YouTube User?

Robert Atkinson robert8rpi at yahoo.co.uk
Tue Mar 13 02:18:18 CDT 2012

Hi Chris,
Thanks for the comment. I was using 433pCi/g for lo sodium salt subsitute which is a mostly Potassium chloride and some sodium chloride. This results in a lower spA compared to elemental K.

From: Chris Alston <achris1999 at gmail.com>
To: The International Radiation Protection (Health Physics) Mailing List <radsafe at health.phys.iit.edu> 
Sent: Tuesday, 13 March 2012, 2:03
Subject: Re: [ RadSafe ] How Would You Advise this YouTube User?


K and Cs are chemical analogs, so it is quite appropriate to compare
the two.  K-40 is actually a bigger beta than Cs-137 (it's 1.3 MeV),
and K-40 is continuously present in the body.

Paul Frame has a succinct little write-up on
www.orau.org/ptp/collection.  Please note, as I recall it, the
elemental spA of K-40 is closer to 850 pCi/g (cf. Environmental
Radioactivity, 4th edition), but I may misremember.


On Mon, Mar 12, 2012 at 10:25 AM, Robert Atkinson <robert8rpi at yahoo.co.uk>wrote:

> Hi,
> Just to put the 500Bq/kg food limit in perspective, low sodium "healthy"
> salt subsitute contanis Potassium and thus K40, Specfic activity is about
> 433pCi/g or THIRTYTWOtimes the 500Bq/kg limit. Yes I know it's K40 not
> Cs137 and you don't eat kilograms of salt. but it is a good indication of
> the scale used in the food limit. Dried Apricots run about 370Bq/kg and the
> infamous bananas about 90Bq/kg from K40.
> Robert Atkinson CEng.
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