[ RadSafe ] krypton-85

John Jacobus crispy_bird at yahoo.com
Thu Aug 17 12:50:41 CDT 2006

In nuclear medicine facilities activated charcoal
traps are used for the collection of expired Xe-133
that is given to patient undergoing ventilation tests.


As I remember, the blower fan is turned off after each
study.  Otherwise, the gas is pushed through the
filter into the room.  

--- Otto Raabe <ograabe at ucdavis.edu> wrote:

> At 04:20 AM 8/16/2006, Krzesniak, Michael F wrote:
> >Is it possible to capture krypton-85 gas using
> activated carbon or other
> >filtration methods?
> ************************************
> Small limited quantities of the inert gas radon can
> be collected with an 
> activated charcoal filter by physical adsorption, so
> I expect the same 
> would be true for the inert gas krypton. However,
> one would expect that 
> this process would not be effective for large
> quantities of krypton. You 
> could do some experiments to measure the saturation
> level. The collected 
> krypton can be measured by external measurement of
> the filter before and 
> after heating it to release the adsorbed gases..
> Otto
> **********************************************
> Prof. Otto G. Raabe, Ph.D., CHP
> Center for Health & the Environment
> University of California
> One Shields Avenue
> Davis, CA 95616
> E-Mail: ograabe at ucdavis.edu
> Phone: (530) 752-7754   FAX: (530) 758-6140
> *********************************************** 
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>From an article about physicians doing clinical studies: 

"It was just before an early morning meeting, and I was really trying to get to the bagels, but I couldn't help overhearing a conversation between one of my statistical colleagues and a surgeon.

Statistician: "Oh, so you have already calculated the P value?"

Surgeon: "Yes, I used multinomial logistic regression."

Statistician: "Really? How did you come up with that?"

Surgeon: "Well, I tried each analysis on the SPSS drop-down menus, and that was the one that gave the smallest P value"."

-- John
John Jacobus, MS
Certified Health Physicist
e-mail:  crispy_bird at yahoo.com

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