RE: "Hot Particle"

[Glen.Vickers@ucm.com]

NRC IE 90-48 provides a definition of a hot particle based upon the musings
in NCRP 106.  Both reports say the critical factor is the potential for
localized exposure, but IE 90-48 went ahead and defined a hot particle.  A
hot particle is a "discrete radioactive fragment that is insoluble in water
and is less than 1 mm in any dimension."  Also take a look at INPO 89-006
which has some exposure-related rules of thumb.

It is critical that anyone involved in this area get copies of IE 90-48 and
NCRP 106.  The IE 90-48 document tells you how the NRC will judge the
exposure consequence of a hot particle exposure and relate it to the annual
50 rem SDE limit for the purposes of enforcement.  

The most important points are to set up point/plane source action levels for
different attenuating materials (i.e. dpm-hr) and to understand the
difference between hot particle dose and SDE.  Action levels help you screen
for the one required dose calculation for every 100 exposures to hot
particles or planar sources.  The code of choice seems to be Varskin.

Glen Vickers
glen.vickers@ucm.com

> -----Original Message-----
> From:	Marthaller, Chris [SMTP:marthac@wipp.carlsbad.nm.us]
> Sent:	Thursday, July 27, 2000 6:51 PM
> To:	Multiple recipients of list
> Subject:	"Hot Particle"
> 
> There seems to be a plethora of information running around on what
> constitutes a "Hot Particle."  Is there any information that is available
> from INPO, NRC, DOE, NCRP, ICRP, etc. that provides guidance for this
> information.
> 
> 
> Chris Marthaller, RRPT
> Sr. Training Coordinator
> WIPP
> (505) 234-1848
> marthac@wipp.carlsbad.nm.us
> 
> ************************************************************************
> The RADSAFE Frequently Asked Questions list, archives and subscription
> information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html


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