Search found 5 matches

by Hans-Jörg
10 Aug 2019, 21:40
Forum: General discussion
Topic: Beta + decay and 511 kev annihilation peak
Replies: 3
Views: 167

Re: Beta + decay and 511 kev annihilation peak

Hello, K-40 has three independent kinds of decay: beta- (for K 28.2 decays per gram and s, for KCl 14.8 decays per gram and s) electron capture (gamma) (for K 3.33 decays per gram and s, for KCl 1.75 decays per gram and s) beta+ decay is very rare (10 decays from a million) and can not be seen with ...
by Hans-Jörg
23 Jul 2018, 18:22
Forum: Spectrum
Topic: Bremsstrahlung from tritium
Replies: 3
Views: 1541

Re: Bremsstrahlung from tritium

Steven,

maybe the 5keV are not correct, but the peak at the left will only be there with the marker inside the shield. This is why I made a background spectrum with same settings. I set the left treshold to a value excluding the noise.

Hans-Jörg
by Hans-Jörg
22 Jul 2018, 20:47
Forum: Spectrum
Topic: Bremsstrahlung from tritium
Replies: 3
Views: 1541

Bremsstrahlung from tritium

Hello Some years ago I bought a trigalight marker. With a reflector made from an alu sheet, I used it as a very faint torch. When completely dark, one can see things in a distance of about ten centimeter. This marker contains a tiny glass tube filled with tritium and coated in the inner side with a ...
by Hans-Jörg
13 May 2018, 20:41
Forum: Spectrum
Topic: Lanthanum in NiMH Batteries
Replies: 3
Views: 1379

Lanthanum in NiMH Batteries

Hello A short time ago I found that lanthanum is used in NiMH batteries. As lanthanum contains a small amount (about 0.09 %) of an instable isotope (La-138) with a half-life of 1011 years, I tried to detect it in the batteries. It is similar to potassium-40, where the half-life is shorter (1.3*109 y...
by Hans-Jörg
30 Apr 2017, 16:41
Forum: Introductions
Topic: Hello!
Replies: 1
Views: 1536

Hello!

Hello, my name is Hans-Jörg Wildanger, I am 62 years old and I am living in Germany near Saarbrücken. Since my early days, I have been interested in science, especially chemistry and electronics. Some years ago, as parts became cheaper and more available, I started with radiation measuring with Geig...