[ RadSafe ] Respirable Dust as a Surrogate for Airborne Radioactivity

Peter Collopy chaosforthefuture at yahoo.com
Wed Dec 4 18:04:33 CST 2013

 Looking for help in identifying papers/presentations where the paper addresses the use of respirable dust measurements as a real time surrogate for airborne radioactivity. I did a bunch of on line searching but couldn't come up with any papers or presentations even though I know they are out there. For example abut 20 years ago at the HPS Midyear in Coeur d'Alene I first heard about using this technique from someone at the DOE discussing soil remediation and radiation protection controls. Unfortunately I had to move numerous times (its a long and sordid story why) so I don't carry any of my old materials from those conferences.

The HP Journal search turns up an excessive amount of papers on respirable fraction which is not what I am looking for.

For those who have never used the technique its simply using the soil concentrations and by assuming the ratio of activity per gram of soil must be the same as that in air one converts the respirable dust measurement to pCi/g. In math terms that is ug/m^3 (respirable dust measurement) * pCi/g (soil concentration) = uCi/cc with the proper units conversion. The number is always conservative because not all the activity in the soil is of a respirable size even when re-suspended in air. Obviously it can't be used for volatile or semi-volatile substances.

Any leads are appreciated

Pete C

Peter Collopy, CIH, CHP, CSP 
Director, Entropy Control 
Chaos for the Future 
3940 7th Avenue
San Diego CA 92103

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