Re: Measuring the uniformity of an electron beam

[William Prestwich <prestwic@mcmail.CIS.McMaster.CA>]

How about gafchromic film?
Bill Prestwich
Physics Dep't. McMaster University

E-mail: Prestwic@mcmaster.ca


On Tue, 15 Jul 1997, Edwards, Richard W wrote:

> We've been asked to come up with a way to measure the energy deposition
> across a relatively large surface from an electron beam system. The end
> result is to determine whether or not there is uniform deposition
> (+/-5%) across a two foot by two foot square. The system uses electrons
> accelerated up to 30 keV (typically 17 keV). About all we have so far in
> terms of total deposition is that it will deposit 10 microCoulombs per
> cm2 in a 10 micron polymide layer during a typical application. We are
> guessing that this application utilizes a 2 minutes exposure.
> 
> Some other problems. We're dealing with a sealed vacuum chamber with no
> real ability to insert leads for powered systems or real time
> monitoring. I assume our best bet is going to be to use TLDs placed on a
> suitable backing.
> 
> Any experience or suggestions?
> 
> Rick Edwards, Analyst
> 
> The Boeing Company, Radiation Protection Technical Services Group
> (425) 393-8250
> >Richard.W.Edwards@Boeing.com
>