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

Ted de Castro tdc at xrayted.com
Thu Jul 2 14:49:53 CDT 2015

nope - they were talking about characteristic x-rays from a kvcp tube 
after filtering and reflecting of the full spectrum.

Its just that to x-ray spectroscopists a few 10's of kV is "high energy" 
or "hard" x-rays.

On 7/2/2015 12:23 PM, Chris Alston wrote:
> Ted
> 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
> developments.
> Happy 4th
> ca
> ---------- 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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