Hi Charles,
I would like to see a close up photo of your Si-PIN alone.
Randall
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----- Original Message -----
From: Charles David Young <charlesdavidyoung@...>
To:
[email protected], Mike Loughlin <loughlin3@...>
Sent: Tue, 07 Jan 2020 10:42:31 -0800 (PST)
Subject: Re: [XRF] Tritium with Amptek Si-PIN vs NaI
And here is an XRF of a Nb disk that George provided me that is being
excited by a single Am241 button. I have included a photo of the setup.
The Am241 is glued to a lead strip and is pressed up against the Nb disk in
a baggy. The red Si-PIN protective cap is peeking out below just behind
the lead strip. As you can see the Nb Ka and Kb peaks are very clear and
there is hardly a trace of the normal Np peaks from the Am241. For
comparison I have included that same Nb scan alongside an Am241 scan that
is not shielded (blue)
It really is amazing how nice an exciter Am241 is when it is properly
shielded and placed in front of the target.
Charles
On Tue, Jan 7, 2020 at 10:59 AM Charles David Young <
charlesdavidyoung@...> wrote:
I have been playing with the Si-PIN that I got from Geo and am getting
some great results. When measuring a tritium keychain with NaI I get a
strong peak down in the teens (dark blue) but I have never been sure where
to place that peak given that this is a broad Bremsstrahlung region. I had
been placing it at 11keV because this is supposed to be in the middle of
that region.
However, my Si-PIN results show how dominant the Zn sulphide peaks are so
now I would place my NaI peak right between them at 9keV. That makes for a
great calibration point at the extreme low end of my NaI setup.
Charles
