Mr. Dupray
I agree that in order to calibrate an instrument you need to have a well characterized source, but I believe that if you calibrate an instrument to a known source, as you suggested, and then immediately determine a baseline response from a well understood ( nuclides, energy, buildin time etc. ) that you should be able to use a source that has not been formally characterized as a routine ( daily ) instrument response check source. I believe that this is the normal situation for cs-137 and tc-99 sources that are sold for portable instrument source checking. This same level of source control is also used for installed daily source check sources.
... mine and mine alone ...
Ron LaVera
lavera.r@nypa.gov
-----Original Message-----
From: Mike Dupray [mailto:dupray@gat.com]
Sent: Monday, September 21, 1998 12:23 PM
To: Multiple recipients of list
Subject: Re: Lantern mantles
I beleive you are all making a mistake. Use of lantern mantles is only good
for demo's and shows. You cannot properly performance test an instrument
with an uncalibrated source. You need to prove that the calibration of the
instrument is still good. The only way to do it right is to use a traceable
standard(s) and test each scale to mid scale. Anything else tells you
nothing except that the needle moves when exposed to radiation.
At 10:59 AM 9/21/98 -0500, you wrote:
>McMaster-Carr
>9630 Norwalk Blvd.
>Sante Fe Springs, CA
>90670-2932
>
>
>(310) 692-5911
>(310) 695-2323
>
>propane lantern replacement mantles stock number 10205T74
>
>These are not Coleman, but they work. You get two per package. Each
>will give a reading of 0.5 mr/hr to 1.0 mr/hr through tape.
>
>Patrick Muldoon
>patrick.muldoon@med.va.gov <mailto:patrick.muldoon@med.va.gov>
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