[ RadSafe ] Hot Particle Definition (UNCLASSIFIED)

[Falo, Gerald A Dr CIV USA MEDCOM PHC]

Classification:  UNCLASSIFIED 
Caveats: NONE

Harry,

I would try NCRP Report No. 130, Biological Effects and Exposure Limits
for "Hot Particles."  I skimmed it and found for the purposes of the
report "hot particles are considered to be >10 um but < 3,000 um in any
dimension." (page 3, near the bottom)  Chapter 2 is titled, "Origin and
Nature of Hot Particles."

Jerry

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Neill Stanford
Sent: Tuesday, May 18, 2010 8:10 PM
To: 'Harry Reynolds'; radsafe at agni.phys.iit.edu
Subject: Re: [ RadSafe ] Hot Particle Definition

Harry,
Without digging up references, I don't think there is a precise
definition.
It is a generic/qualitative term. Official documents usually say
something
like "Highly radioactive ("Hot") particle" 
If you can't see it, but it is localized and sends your meters off-scale
then you can call it a hot particle. They became famous in NPP's,
typically
a result of compromised nuclear fuel, measure in single micrometers or
even
nanometers, and are big beta emitters with big dose rates.
The real issues are: knowing that they exist, how to look for them and
what
to do about calculating dose when you find one.

For more info, I'd Google "Radioactive hot particle NRC"

Sincerely,

Neill Stanford, CHP
Stanford Dosimetry, LLC
stanford at stanforddosimetry.com 
www.stanforddosimetry.com 
(360) 733-7367 (V)
(360) 933 1794 (F)


-----Original Message-----
From: Harry Reynolds [mailto:hreynolds at energysolutions.com] 
Sent: Tuesday, May 18, 2010 1:30 PM
To: radsafe at agni.phys.iit.edu
Subject: [ RadSafe ] Hot Particle Definition


 Can someone provide me with or direct me to an accepted and clear
definition of a "hot particle"?

Thanks

Harry Reynolds
ASRSO
ENERGYSOLUTIONS
801-649-2219 Desk
801-349-9036 Cell 

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Classification:  UNCLASSIFIED 
Caveats: NONE