Yes all data is there. The Beta disc is Tc-99 (not Tc-99m!)
One of the 1" is 12,000 DPM, the other is 15000 DPM (1987). Referred to by S/N and DPM in the .mca and pic filenames.?
Got rid of the 59.5- it must have been coming from Am exciter even though removed some distance. Added a few inches of lead?and stored the exciter in lead. No 59.5....Duh. I didn't really think 59 keV would travel that far or that the detector would be so sensitive to it....live and learn.
Geo
----- Original Message -----
From: Dude <dfemer@...>
To:
[email protected]Sent: Tue, 24 Dec 2019 14:08:46 -0500 (EST)
Subject: Re: [XRF] Looking at Radium-226 from a rare perspective.
Geo,
I can¡¯t make out the fuzzy photo of the disks. Are these Th 230 disks
calibrated ?SS plated with the dpm value on the label? What activity. ?Are they
plated over the entire surface or just a spot?
I use a plated Th 230 1¡± 11.700 dpm and a 2¡± 16,300 dpm set for doing
radon counting to determine alpha counter efficiency and for the alpha spec cal.?
I never thought to try an X-ray count on them. ?Nice!
Dud
?
From: [email protected]
[mailto:[email protected]] On Behalf Of GEOelectronics@...
Sent: Tuesday, December 24, 2019 9:46 AM
To: [email protected]
Subject: Re: [XRF] Looking at 16.300 dpm. ionium) discs are much
more efficient than the 2" disc on both the Amptek detectors. Makes sense,
they are nearly perfectly matched in size, with all the contents concentrated
in a smaller area.
Radium-226 La,Lb, Lg are standing out.
Besides those, there is an expected 67.67 keV Gamma Ray, and an unexpected
~59.4 keV
peak. These two also? line up well with tungsten Ka-Kb. Gold would be
expected, but not tungsten. ??
An XRF of the back of the metal disc showed the usual iron and chromium
expected in stainless steel, no sign of any of the other rays 9(elf shielding)
Pics and .mca attached
Geo
