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Re: Color TV screens as radon daughter collectors
It depends on the radon levels in the area of the screen. In high radon
level homes (>200 pCi/l) you don't even need the electrostatic depostion
provided by the screen. Just walk around for about a half hour with a
sweater on and you'll be able to get a reading with a 2" pancake probe
or a microR meter. If the radon levels are low (in the range of 1 - 4
pCi/l) you'll need to collect a lot of dust off a large screen (i.e.,
high voltage) and a thin window GM tube. Filter paper (such as that
used for swipes) works well. Of course, if you have access to a low
background gas flow proportional counter you'll be able to see very low
levels.
Gerald Nicholls
NJDEP
609-633-7964
Gerald.Nicholls@dep.state.nj.us
>>> "North, David" <DNorth@LIFESPAN.ORG> 11/15/02 11:09AM >>>
Dear Radsafers,
I know this subject has come up on the List before, but I wasn't
paying
really close attention. Now my daughter needs some sort of science
project,
and I thought it might be possible for her to assay some airborne dust
(hopefully laden with radon daughters) that collects on TV and PC
monitor
screens. Are there any tips out there for doing this? What's good for
cleaning the screens? What's good for counting, a thin-window GM? How
long
does the TV have to be powered on to collect enough?
Any help will be much appreciated. If my daughter is happy, the whole
family
will be happy!
David L. North, Sc.M. DABR
Associate Physicist
Department of Medical Physics
Main Bldg Rm 317
Rhode Island Hospital
593 Eddy St.
Providence, RI 02903
ph: (401)444-5961
fax: (401)444-4446
dnorth@lifespan.org
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