Search found 626 matches

by Steven Sesselmann
20 Aug 2019, 18:59
Forum: Admin Announcements
Topic: Linking to images on remote servers
Replies: 0
Views: 14

Linking to images on remote servers

Hi All, One of our members has brought it to my attention that images hosted on a remote server will not show on this forum unless the site also runs https protocol, this makes sense, but may not be immediately obvious. Other disadvantages of linking to remote sites are when those sites go down, so ...
by Steven Sesselmann
20 Aug 2019, 09:04
Forum: Spectrum
Topic: Cs-137 contamination in Austria
Replies: 4
Views: 65

Re: Cs-137 contamination in Austria

Milos,

Thanks for sharing, it does indeed look like a very beautiful spot, and maybe not so surprising if fallout has accumulated in the silt as water washes it down the mountain. Archeologists in the future will be able to date their core samples to the exact year.

Steven
by Steven Sesselmann
13 Aug 2019, 14:17
Forum: Spectrum
Topic: Radiation release near Severodvinsk
Replies: 10
Views: 153

Re: Radiation release near Severodvinsk

I too heard it on the news this morning, it seems like the location is extremely remote. It's unfortunate that Radu Motisan doesn't have any monitoring units around that area, else it might have shown up..

https://www.uradmonitor.com

Steven
by Steven Sesselmann
07 Aug 2019, 11:50
Forum: Introductions
Topic: Hello from London.
Replies: 1
Views: 36

Re: Hello from London.

Hello Matthew, Welcome to the forum and sorry I had to approve your post first, we have had some problems with spammers, so now I approve the first three posts by new members. Reading from your introduction I am sure you will fine likeminded people here, at least on the side of radiation detection. ...
by Steven Sesselmann
04 Aug 2019, 16:30
Forum: Spectrum
Topic: Will the real K-40 please stand up (please stand up, please stand up)
Replies: 12
Views: 177

Re: Will the real K-40 please stand up (please stand up, please stand up)

Silviu, The automatic selection of ROI in PRA works best when the SD has been calibrated correctly. Pressing the keys [d], [f] and [g] selects a region spanning 1, 2 and 3 standard deviations. The default standard deviation is 1 however it's not uniform across the spectrum, so to set it properly you...
by Steven Sesselmann
03 Aug 2019, 09:41
Forum: Spectrum
Topic: Contamination with Cs-173 in the Czech Republic
Replies: 2
Views: 53

Re: Contamination with Cs-173 in the Czech Republic

Milos,

Thanks for sharing.

It sure looks like mushrooms do a good job of mopping up contaminated ground, maybe you can commercialise it :)

Steven
by Steven Sesselmann
30 Jul 2019, 10:06
Forum: Spectrum
Topic: Will the real K-40 please stand up (please stand up, please stand up)
Replies: 12
Views: 177

Re: Will the real K-40 please stand up (please stand up, please stand up)

Silviu, Good analysis above, it seems your detector will become linear at around 670 Volts, so as long as you can get enough volume there shouldn't be a problem running at 670. Once you have the linearity right you then need to check the resolution at that voltage. Sometimes you can be fooled by hig...
by Steven Sesselmann
29 Jul 2019, 11:27
Forum: Spectrum
Topic: Will the real K-40 please stand up (please stand up, please stand up)
Replies: 12
Views: 177

Re: Will the real K-40 please stand up (please stand up, please stand up)

Silviu, Remember that the volume setting is not the only way to change gain, you also have voltage and I recommend that you find optimum voltage first by doing a quick linearity check. The most convenient source for checking the linearity is Thorium because it has so many peaks. The attached chart c...
by Steven Sesselmann
29 Jul 2019, 07:50
Forum: Introductions
Topic: Hello from Czech Republic
Replies: 1
Views: 54

Re: Hello from Czech Republic

Hello Milos,

Welcome to the forum and thanks for giving us an insight into your beautiful city.

Please feel free to share the results of your measurements on the forum.

Steven
by Steven Sesselmann
29 Jul 2019, 07:21
Forum: Spectrum
Topic: Will the real K-40 please stand up (please stand up, please stand up)
Replies: 12
Views: 177

Re: Will the real K-40 please stand up (please stand up, please stand up)

Silviu, Your volume is too high, it needs to be set lower so your spectrum falls in the range 0 -100 arb.u. What you are observing above is a pileup in the last bin. A good rule of thumb is to get the k40 peak showing at 50 arb.u (middle of the screen). For the most part you can ignore the peak in t...