Re: Request for Thorium-232 Radiological Properties

["John R Johnson" <idias@INTERCHANGE.UBC.CA>]

Brent



I think the main difference is that Th-232 always contains some (>40% by

activity) Th-228. This decay to Ra-224 which is the precuser of Rn-220. DU

contains a small amount of U-234 which is a parent of Rn-222, but the

build-up to levels of concern would of the immediate precuser (Ra-226) would

take centuries.



John



----- Original Message -----

From: <bnasca@kcp.com>

To: <radsafe@list.vanderbilt.edu>

Sent: Monday, April 30, 2001 11:03 AM

Subject: Request for Thorium-232 Radiological Properties





> Dear RADSAFE:

>

> Can anyone tell me if working with items radiologically contaminated with

> Thorium-232 would be any different than handling items contaminated with

> depleted uranium (DU)?  I am experienced in monitoring for and controlling

> DU, but have not worked with Th-232.  Would probably be working with items

> Th-232 contaminated in the range of 500 to 2,000 dpm/100cm2.

>

> Thanks for an excellent resource in RADSAFE.

>

> Sincerely,

>

> Brent M. Nasca,

> Health Physics

> (816) 997-7197

> bnasca@kcp.com

>

>

>

>

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