[ RadSafe ] Fwd: Looking for vendor for "hard xray" spectormeter calibration source.
phils at umich.edu
Tue Jun 30 08:13:14 CDT 2015
Cd-109 may be useful. It is a common gamma spec calibration isotope. The 88 keV gamma may be too high for your needs, but there are high abundance associated daughter Ag K alpha and K beta x-rays at 22 and 24 keV. Fe-55 with Mn daughter x-rays around 6 keV might also be helpful depending on exactly what you are trying to do. Check with Isotope Products Laboratories and their on-line catalog.
> On Jun 29, 2015, at 9:39 PM, Ted de Castro <tdc at xrayted.com> wrote:
> 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?
>> ---------- Forwarded message ----------
>> From: Ted de Castro <tdc at xrayted.com>
>> Date: Mon, Jun 29, 2015 at 1:58 PM
>> Subject: [ RadSafe ] Looking for vendor for "hard xray" spectormeter
>> calibration source.
>> To: "The International Radiation Protection (Health Physics) Mailing List" <
>> radsafe at health.phys.iit.edu>
>> I looked in the journal and on the website for vendor data and was shocked
>> to see how few ads there were. This seems like something to be concerned
>> Anyhow - I need to refer a client to what he refers to as a "hard" x-ray
>> calibration source for an x-ray spectrometer. They specifically mentioned
>> an Am source and are looking for energies in the couple of 10's of keV (I
>> don't usually think of that low an energy as "hard").
>> I am trying to get more info on the spectrometer and its detector but
>> thought I'd start this query going now. The x-ray source for the analyzer
>> is a high intensity Indium anode source - this may give you some idea of
>> what they want and is pretty much all I can say about it. I think a vendor
>> or user in the area would recognize the need.
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