Search found 693 matches

by Steven Sesselmann
10 Dec 2019, 07:26
Forum: Spectrum
Topic: Refurbishing project of a large 5”x3” NaI(Tl) detector.
Replies: 4
Views: 69

Re: Refurbishing project of a large 5”x3” NaI(Tl) detector.

Luuk,

Thanks for sharing your project and giving us an insight into the mystery of canned NaI crystals.

I am interested in a source source of teflon, looks like you have it on a big roll, but I also understand if it is a trade secret ;)

Nice detector.
by Steven Sesselmann
09 Dec 2019, 21:41
Forum: Detectors
Topic: More fun with CeBr3
Replies: 2
Views: 34

More fun with CeBr3

I just finished a nice detector for a customer with a 1.5" x 1.5" CeBr3 crystal, and unfortunately I have to ship it out tomorrow, but before I do, I like to share the spectrum with you. The resolution of CeBr3 is slightly lower than LaBr3, but it doesn't suffer from the internal noise, which I thin...
by Steven Sesselmann
08 Dec 2019, 21:22
Forum: Resources
Topic: Simple Thorium Linearity Check with Excel
Replies: 2
Views: 34

Simple Thorium Linearity Check with Excel

I know we have covered this before, but the many peaks all the way up to 2614 makes Thorium a good choice for calibrating and checking the linearity of probes, and it is also easily accessible. There are a number of things that affect the linearity of a spectrum, PMT, divider, voltage and electronic...
by Steven Sesselmann
06 Dec 2019, 11:27
Forum: Resources
Topic: Attenuation & absorption calculator.
Replies: 1
Views: 28

Attenuation & absorption calculator.

Hi All,

I found this handy efficiency calculator today. Easy to look up shielding thickness etc..

https://www.crystals.saint-gobain.com/p ... calculator

Steven
by Steven Sesselmann
05 Dec 2019, 10:20
Forum: Detectors
Topic: HPGe detector back to life after long sleep
Replies: 8
Views: 98

Re: HPGe detector back to life after long sleep

Janni,

That's a lucky scoop, and well done on fixing and restoring the electronics.

The spectra are spectacular, I wish one day a room temperature detector will come close to this resolution.

Steven
by Steven Sesselmann
03 Dec 2019, 13:55
Forum: Spectrum
Topic: A Day in Fukushima - Gamma Spectroscopy
Replies: 15
Views: 230

Re: A Day in Fukushima - Gamma Spectroscopy

Massimo,

Thanks for sharing your adventure, great report, enjoyed reading it.

Steven
by Steven Sesselmann
02 Dec 2019, 09:25
Forum: Detectors
Topic: Fun with LaBr3
Replies: 6
Views: 113

Re: Fun with LaBr3

Thanks Luuk, I must experiment with some of those ultra and super bialcali PMT's. The background LaBr3 spectrum confused me because at first I thought I was seeing K40 at 1460 and Tl208 at 2614. Next week I will be making a 40 x 40 mm CeBr3 detector, should be interesting to see how it compares. Ste...
by Steven Sesselmann
01 Dec 2019, 19:54
Forum: Spectrum
Topic: Ra226 spectrum from Scionix 35B57
Replies: 7
Views: 137

Re: Ra226 spectrum from Scionix 35B57

Conor, Your spectrum looks great and your method is sound. Finding the best voltage for linearity is a good way to start. Occasionally you might come across a difficult probe and then there might be a problem with the voltage divider. A second check is to find the count rate plateau, this is a volta...
by Steven Sesselmann
30 Nov 2019, 21:23
Forum: Detectors
Topic: Fun with LaBr3
Replies: 6
Views: 113

Re: Fun with LaBr3

I need to correct my statement about intrinsic background in the LaBr3 crystal. There is actually some quite prominent peaks in the BG spectrum, initially I thought the La138 gamma at 1435 keV was K40 but it just happens to correlate closely. There is also an x-ray at 32 keV that correlates to the C...
by Steven Sesselmann
30 Nov 2019, 16:11
Forum: Detectors
Topic: Fun with LaBr3
Replies: 6
Views: 113

Fun with LaBr3

Hi all, Today I have been having fun building and testing a small 1" x 1" LaBr3 detector. After seeing the 3.1% resolution I'm not sure if I will ever be happy with NaI(Tl) again :) While running the background spectrum I didn't see much of the internal radiation from this crystal, but that might be...