Search found 154 matches

by Peter-1
03 Sep 2020, 20:04
Forum: General discussion
Topic: old Units
Replies: 3
Views: 184

Re: old Units

I do not want to know the Bq / liter, but rather whether it is possible to calculate the activity of the source that generates this ME units.
by Peter-1
03 Sep 2020, 19:31
Forum: General discussion
Topic: old Units
Replies: 3
Views: 184

old Units

hello, Who has an idea how I can convert a radiation source with radium from an old emanation apparatus with an indication of 25000 ME (Mache) into a current unit? I don't mean the familiar conversion. 1 ME = 3,64 Eman = 3,64×10−10 Ci/l = 13,4545 Bq/l What I am looking for is the activity of the sou...
by Peter-1
21 Aug 2020, 19:36
Forum: Detectors
Topic: Building a LaBr3:Ce Gamma Spectrometer
Replies: 10
Views: 496

Re: Building a LaBr3:Ce Gamma Spectrometer

Hello, I am impressed how good the resolution is. But now I also wanted to check whether the two lines can be resolved with my NaI crystal. In order to suppress the area of ​​low energy, I placed a copper plate with a thickness of 21mm in front of the NaI crystal 2"x 2". I used ThF4 from Oerlikon-Ba...
by Peter-1
17 Aug 2020, 02:31
Forum: Spectrum
Topic: Unknown uranium mineral found in Penticton B.C. while on holidays
Replies: 9
Views: 489

Re: Unknown uranium mineral found in Penticton B.C. while on holidays

Hello,
by the color and the high count rate, it could be Curite. At least very interesting.
https://en.wiktionary.org/wiki/curite

Peter
by Peter-1
11 Aug 2020, 23:30
Forum: Spectrum
Topic: Uranium Glass – Different Glassware, Still Natural Uranium
Replies: 5
Views: 428

Re: Uranium Glass – Different Glassware, Still Natural Uranium

I did a little test to see if I can see the Ka or Kb line of iodine. To do this, I used Am241 to irradiate a container with potassium iodide. I shielded the direct radiation from Am241 with lead. As you can see, my calibration is quite good.
X-ray-KI.jpg
Peter
by Peter-1
11 Aug 2020, 02:17
Forum: Spectrum
Topic: Uranium Glass – Different Glassware, Still Natural Uranium
Replies: 5
Views: 428

Re: Uranium Glass – Different Glassware, Still Natural Uranium

Hello,
it can come from iodine. The K-beta line is at 32.3 keV. The line can also be seen well in an experiment with an old colored glass from Schott VG3.
2020_08_10-Schott-VG3.png
2020_08_10-Schott-VG3.png (97.3 KiB) Viewed 378 times
Peter
by Peter-1
06 Aug 2020, 18:46
Forum: Detectors
Topic: PMT supply: positive vs. negative
Replies: 3
Views: 305

Re: PMT supply: positive vs. negative

There is a good explanation from Hamamatsu. There is a very similar text by EMI.
PMT-ground.jpg
Peter
by Peter-1
19 Jul 2020, 18:38
Forum: Detectors
Topic: Pulse height shift with pulse rate?
Replies: 9
Views: 1286

Re: Pulse height shift with pulse rate?

Hello Mike,
I have another circuit directly on the PMT. So I'm independent of the capacity of the cable. Of course, this circuit needs more power. The scintilator head comes from Siemens.
Szintillator-06.jpg
Szintillator-06.jpg (57.17 KiB) Viewed 896 times
Peter
by Peter-1
09 Jul 2020, 01:26
Forum: Spectrum
Topic: Uranium Ore from Wittichen
Replies: 12
Views: 1237

Re: Uranium Ore from Wittichen

hello Lucas, nice to see a new member from Bavaria. My question about the stone. Can you find such stones in the wild in this area, or do you have to search for them? I have a fairly pure U sample as UO2. A black powder. It does not show any decay products yet. A soil sample from Gottow from the old...
by Peter-1
22 Jun 2020, 00:40
Forum: Detectors
Topic: Pulse height shift with pulse rate?
Replies: 9
Views: 1286

Re: Pulse height shift with pulse rate?

I can also make a contribution to this topic. I also recorded different pulse frequencies for my system. But I also have to say that my high voltage is very stable and the resistances between the dynodes of the PMT are very low. So the lines do not change, but the intensity is influenced. It is like...