[ RadSafe ] Thermo Fisher CM-11
JGinniver at aol.com
JGinniver at aol.com
Thu Jan 24 14:33:50 CST 2008
Hi,
You don't specify what model you ae interested in. The CM11-F use a gas
flow proportional probe and so probably ins't suitable for your application.
The CM11-E use a standard scintillation type 100cm2 alpha and beta
contamination probe. The version on the CM11E is listed as the DP6DD which has a thinner
foil for improved efficiency, however my experience with thinner aluminised
mylar foils is that they are more light sensitive and so aren't really
suitable for outdoor/bright sunlight applications. Thermo used to do a version of
the DP6 which they termed Endura which was designed to be more robust for
outddor/agressive working environments, although they had prodution problems
(the aluminium light tight coating was applied directly to the
scintillator/phosphor). I'm assuming that as you are interested in the Radon rejection
function that you are interestd in monitoring for alpha and beta emitting
radionuclides? If not the CM-11 can be configured to monitor for beta only, but I
can't remember what model this would be.
I can't really comment on the radon rejection function as we are interested
in monitoring for alphas and consequnetly take radon probelms (static
actraaction to clothing and hard hats as an occupational hazard) We try and
discourage the wearing of man made fibres in area where we may have a potential
radon probelm. And any items 'contaminated' with alpha. are removed bagged and
rechecked after a period of hours to confirm whether it was a Radon problem or
a genuine contamination event.
Before I forget, they are not what I would term portable, they are really
deisgned for wall mounting, although we have mounted them on 'sack trolleys' for
use at temporary controlled areas. They are however mains powered (or at
least I've never seen a battery powered version).
Hope this helps,
Julian
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