[ RadSafe ] Fwd: Fwd: Looking for vendor for "hard xray" spectormeter calibration source.

Chris Alston achris1999 at gmail.com
Thu Jul 2 14:23:54 CDT 2015


What's the betting that, when they say "40 keV", they really mean 40 kVp,
and they're talking about the accelerating potential of the x-ray
generator?  Anyway, this is interesting, so pls. keep us posted on

Happy 4th

---------- Forwarded message ----------
From: Ted de Castro <tdc at xrayted.com>
Date: Mon, Jun 29, 2015 at 9:39 PM
Subject: Re: [ RadSafe ] Fwd: Looking for vendor for "hard xray"
spectormeter calibration source.
To: "The International Radiation Protection (Health Physics) Mailing List" <
radsafe at health.phys.iit.edu>
Thanks Chris,
Actually they/I have an Indium spectrum.  Their interests is to energy
calibrate the spectrometer and mentioned energies around 40 keV.  And in
their discussions - they think of these as high energy.  I guess it what's
you are used to - having worked 40 years with high energy accelerators and
diagnostic and orthovoltage x-ray and Co-60, Cs-137 or Ra-226 and alpha-n
neutron sources ---- I have a different "high energy" experience.
Anyhow - what they want right now is a reference to a vendor who sells
these sources - and they do want an Am.
I have yet to discern how large a source and can't get to work on their
license until I have some idea what they will be getting.
Anyhow - right now - its the vendor I am looking for - SURELY - there are a
few who see this list.
When I get more info on the spectrometer - then I can call that company and
see what they recommend.  Right now I have the most info on the x-ray
generator - just finished designing the interlock/safety/control
system/enclosure and getting their state license.

ted de castro

On 6/29/2015 4:59 PM, Chris Alston wrote:

> Xray Ted
> Maybe when he says "hard", he means as nearly mono-energetic as possible.
> Like, with a *copper* anode, you get the k-alpha and -beta x-rays, at ~ 8
> and 9 keV.  Contrast that with the messy bunch of x-rays and a gamma, we
> see from I-125 between ~ 25 - 35 keV.  If you give me a few days, I can
> look up the similar, but uniquely different emissions from indium.  Am-241
> does have a very useful mono-energetic gamma photon at 60 keV (~35%
> intensity), but it seems as though that would be too high an E for what we
> can divine of his uses.  Why not call a company like Rigaku (they're big in
> x-ray diffraction), and ask them how they calibrate their detectors?
> Cheers
> cja

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