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Fiestaware (Depleted Uranium)

Posted: 07 Jun 2019, 07:19
by Go-Figure
Hi there,
This is the cleanest spectrum of depleted uranium I got so far.
My previous depleted Uranium spectra came from Uranium Glass, this time it's Fiestaware (ceramic dinnerware with uranium oxide in its glaze).
Since the spectrum shows depleted uranium the plate dates between 1959 and 1972.

This is also the first time I detected Protactinium 234m, at first I wasn't sure about it, but since the peaks are right on the money it seemed to me it must be it. They are pretty weak in the counts per bin view, much more visible in the energy per bin view.

When I first received the plate I was surprised to read 31000 CPM on my geiger counter's screen, that was almost 20% higher than the read I got from the Pentax Super-Takumar 50mm back lens (see here https://www.gammaspectacular.com/phpBB3 ... ?f=5&t=519), but in terms of gammas this sample was not even close to the Pentax lens, which gave me a level of energy per unit time (at contact) 20 higher than the background, while this one showed an energy per unit time 15% lower than the background (again, at contact).
It was a reminder of how badly a geiger counter can get it wrong, even just comparing samples.

Massimo

Re: Fiestaware (Depleted Uranium)

Posted: 08 Jun 2019, 00:52
by pilgrim
This is my spectrum recorded from a little piece of Fiestaware, about 12-14g.
Fiestaware 14g, 2q, GS1100-PRO+P14, 930V 19,5h.JPG

Re: Fiestaware (Depleted Uranium)

Posted: 09 Jun 2019, 06:06
by Go-Figure
pilgrim wrote:
08 Jun 2019, 00:52
This is my spectrum recorded from a little piece of Fiestaware, about 12-14g.
Fiestaware 14g, 2q, GS1100-PRO+P14, 930V 19,5h.JPG
Did it give you anything above 600 keV? I wasn't entirely sure putting the Protactinium labels so I'd like to know if you got something there as well.

Re: Fiestaware (Depleted Uranium)

Posted: 10 Jun 2019, 01:32
by pilgrim
I'm sorry but I din't checked that part of energies, because I didn't know about the Protactinium :-(
I could try again, maybe with the Uranium glass together the piece of Fiestaware, to have greater activity...