Re: Pu contact dose rates

[Kerimbaev <kerrembaev@yahoo.com>]

Doug,



I think that you are wrong in part about

"This is probably not of great interest to all of



RADSAFE,..."

Contrary, it is a very interesting subject in

light of the latest events in the begining of the

21-st century.



"Everything new is just very well forgetten old"



In my opinion, make simulated source (s) and

calibrate dose rate, X-ray spec meters etc.,



DOE should have technical resources to make it.



Calculations....calculations are good to have on

hands to know what to look for and what to expect

in the end....but how can you be sure without a

real model?





Happy Farther's Day to whom it can be applied.



Emil.



P.S.

Franz, sorry that you have gotten only "a short"

version of the message.

Any way, Franz you can call me kerrembaev,

kerimbaev or what ever you want, just DO NOT call

me collect, alright? :-)





Date: Fri, 31 May 2002 11:24:22 -0400

From: "Minnema, Douglas" 

<Douglas.Minnema@nnsa.doe.gov>

Subject: Pu contact dose rates



Dear RADSAFErs,



I am in need of some of those rare numbers that 

we normally don't worry too

much about - the  alpha-particle contact dose 

rates from tranuranic isotopes

such as the plutoniums, curiums, etc.  Since this



is easily shielded, most

references that I have don't actually calculate 

surface or contact dose

rates.  What I am looking for would be a 

reference for dose rates (or more

likely a method for calculating them) for various



situations ranging from

surface contamination from fine particulates all 

the way to contact with

solid metal.



I have done some calculations myself, but would 

like a referencable source

that I can validate my numbers with and cite in 

formal reports.



Perhaps two examples will help explain the 

request: (1)  a foil of metalic

Pu-238 is in direct contact with a plastic case -



what is the alpha dose

rate on the surface layer of the plastic?  (2) a 

piece of glass is

contaminated with 1E7 dpm per 100 cm^2 of Cm-243 

- what is the alpha dose

rate on the surface of the glass?



This is probably not of great interest to all of 

RADSAFE, please respond to

me directly at the address below.



Thanks,



Doug Minnema, PhD, CHP

National Nuclear Security Administration, US DOE

<Douglas.Minnema@nnsa.doe.gov>















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