Search found 143 matches

by Peter-1
01 Jun 2020, 23:01
Forum: Spectrum
Topic: A Tale of Triple Trinitite
Replies: 6
Views: 89

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: 139

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: 139

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: 139

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: 716

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: 716

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: 716

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: 871

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...
by Peter-1
30 Apr 2020, 19:21
Forum: General discussion
Topic: alpha emitter
Replies: 6
Views: 716

alpha emitter

Looking for a pure alpha emitter i came up with the following idea. Samarium 147 is a pure alpha emitter and contains 15% in natural samarium. You can buy samarium in many countries. According to a research, the activity should be around 850 Bq / gr. What is to be thought of this idea? Samarium147a....
by Peter-1
29 Apr 2020, 07:02
Forum: Shielding
Topic: Tin, and Pewter, and Copper, and Iron, Oh MY!
Replies: 15
Views: 1148

Re: Tin, and Pewter, and Copper, and Iron, Oh MY!

Since I don't get pure tin, I decided to use copper. So I have a first shield with lead and then a layer with 8mm copper. To get an overview of how good the shielding is, I wrote a small program for myself.
Schirmung.jpg

I'm sorry that it is in German.

Peter