Search found 145 matches

by Peter-1
22 Jun 2020, 00:40
Forum: Detectors
Topic: Pulse height shift with pulse rate?
Replies: 4
Views: 261

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...
by Peter-1
08 Jun 2020, 02:45
Forum: Spectrum
Topic: Uranium Glass - Natural or Depleted Uranium?
Replies: 5
Views: 313

Re: Uranium Glass - Natural or Depleted Uranium?

hello Massimo,
a good job and a good result. You have to look for a new uranium glass. I bought a small cube and saw that the peak at U235 is then much smaller than that of old objects.
Peter
by Peter-1
01 Jun 2020, 23:01
Forum: Spectrum
Topic: A Tale of Triple Trinitite
Replies: 10
Views: 622

Re: A Tale of Triple Trinitite

Due to the many suggestions for trinitite, I measured my large piece again. But this time with front and back to the scintillator. Trinitit-2.jpg As can be seen in the spectrogram, the green side in the low energy range is somewhat stronger than the gray side. The red line points to the scintillator...
by Peter-1
22 May 2020, 18:56
Forum: Spectrum
Topic: Alphaspec of Ra226
Replies: 7
Views: 468

Re: Alphaspec of Ra226

hello Steven,

the distance was about 5mm between the surface of the detector and the source, i.e. the clock hand. I am very careful not to touch or destroy the surface of the detector.
Peter
by Peter-1
22 May 2020, 01:33
Forum: Spectrum
Topic: Alphaspec of Ra226
Replies: 7
Views: 468

Re: Alphaspec of Ra226

hello Svilen, The detector is operated with a voltage of 20 volts and has a very sensitive amplifier. This amplifier is DIY and after the first stage has a main amplifier with 1000x to 10,000x gain. I want to increase the voltage to 120 volts in the near future. Maybe the two pictures and texts help...
by Peter-1
19 May 2020, 01:33
Forum: Spectrum
Topic: Alphaspec of Ra226
Replies: 7
Views: 468

Alphaspec of Ra226

I made a first attempt to record the alpha spectrum of Ra226. I did some experiments with my old semiconductor detectors for radiation. These detectors were offered by Siemens for a short time and were available in small quantities. The measurements should actually be made in a vacuum, but that was ...
by Peter-1
13 May 2020, 01:17
Forum: General discussion
Topic: alpha emitter
Replies: 6
Views: 1179

Re: alpha emitter

yes it agrees well with the comments.
by Peter-1
13 May 2020, 00:43
Forum: General discussion
Topic: alpha emitter
Replies: 6
Views: 1179

Re: alpha emitter

hello Jonathan, I took more time and examined different samples. It is clear that the samarium gives so little impulse, but at least I was able to prove it. In order to be absolutely sure that the impulses do not only come from the background and the noise, I measured the background several times. W...
by Peter-1
05 May 2020, 01:11
Forum: General discussion
Topic: alpha emitter
Replies: 6
Views: 1179

Samarium

It did not work ! I received a small sample (10 grams) of samarium and hoped that I would be able to demonstrate the activity with a detector for alpha radiation. The semiconductor detector is very sensitive to alpha radiation which I have previously tested with Am241. Who has an explanation why I c...
by Peter-1
01 May 2020, 19:48
Forum: Spectrum
Topic: My first Mystery Source (Ra226)
Replies: 12
Views: 1323

Re: My first Mystery Source (Ra226)

hello, I have a small sample of fluorescent powder that used to be used to coat the hands of a watch. Ra226 was used in these substances to stimulate ZnS. The spectrum for Ra226 can also be found in old luminous hands on clocks. I am showing such a spectrum here that I have recorded. The shield is b...