[ RadSafe ] New U detector
Brennan, Mike (DOH)
Mike.Brennan at DOH.WA.GOV
Tue Aug 19 11:20:12 CDT 2008
Reserve me a seat on the skeptic side of the aisle. I see several
non-trivial problems with what is described:
1) No detector can detect radiation that doesn't hit the probe. When
you have a weak, shielded source and a small probe that is being moved
fast to survey a lot of containers, geometry is not on your side.
2) If you are looking for the gammas from uranium, there is a lot of
noise in that part of the spectrum (from what I recall). Reliably
picking out the photons you are interested in and ignoring the rest
could be hard.
3) I am far from convinced that uranium is where such screening should
focus. Uranium is a very bad choice for RDD material, and I am far from
convinced that there are any terrorist organizations that have secretly
set up facilities that enrich U-235 to weapons grade. I think it would
be more profitable devising a system that would look for plutonium, but
that is probably even harder to find than uranium.
This sound more like a product in search of a market (or, failing that,
a government contract) than a real problem looking for a solution.
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of Peter Bossew
Sent: Tuesday, August 19, 2008 5:36 AM
Subject: [ RadSafe ] New U detector
Does anybody know technical details of this machine ?
Experiences ? Opinions ?
> New detector can sniff out even low levels of gamma radiation
> By ANI on Tuesday, August 19, 2008
> Filed Under: Health News
> London, August 19 (ANI): Scientists from the Lawrence Livermore
> National Laboratory in California have produced a new detector
> sensitive even to low levels of gamma radiation.
> US shipping ports receive about 6 million cargo containers each year.
> Officials would like to be able to check each one for smuggled nuclear
> material, but today's detectors cannot process such numbers in a
> reasonable time.
> These devices typically require an officer to search inside each
> The gamma rays produced by radioactive materials can pass through
> containers relatively easily, but uranium produces only small amounts
> of such radiation.
> Now, according to a report in New Scientist, Joseph Farmer and
> colleagues at the Lawrence Livermore National Laboratory in California
> have produced a new detector sensitive even to low levels of gamma
> Their device is set to speed up screening times.
> It doesn't directly detect gamma rays themselves, but instead looks
> for the hydrogen peroxide generated when the rays interact with water.
> The detector consists of an "electronic nose" chip coated with a thin
> layer of water that is condensed onto its surface. When gamma rays
> strike water molecules in that layer, the nose chip detects any
hydrogen peroxide formed.
> According to the inventors, as well as being more sensitive, their
> design can pick up a wider range of gamma ray energies than
> conventional detectors. (ANI)
European Commission (EC)
Joint Research Centre (JRC)
Institute for Environment and Sustainability (IES)
TP 441, Via Fermi 1
21020 Ispra (VA)
Tel. +39 0332 78 9109
Fax. +39 0332 78 5466
Email: peter.bossew at jrc.it
"The views expressed are purely those of the writer and may not in any
circumstances be regarded as stating an official position of the
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