Search found 613 matches

by Steven Sesselmann
26 May 2019, 07:56
Forum: Spectrum
Topic: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks
Replies: 9
Views: 526

Re: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks

Massimo,

Where there is a will there is a way !

That's a great result, almost perfect separation of Cs134 and Cs137.

Steven
by Steven Sesselmann
22 May 2019, 16:12
Forum: Spectrum
Topic: Puzzling N.O.R.M. Spectra
Replies: 1
Views: 198

Re: Puzzling N.O.R.M. Spectra

Gary, Your Thorium spectrum looks pretty normal, it appears you have had a bit of temperature drift between the first and second run, plausible for South Australia. The second spectrum also looks like a typical rock containing tome Uranium, also plausible for South Australia :) The two last spectra ...
by Steven Sesselmann
22 May 2019, 11:05
Forum: Spectrum
Topic: Lantern Mantle (Thorium)
Replies: 3
Views: 305

Re: Lantern Mantle (Thorium)

Massimo, As you have discovered Th232 is a good source for multi peak calibration. Some detectors suffer from a bit on non linearity, this can be due the the choice of resistors in the voltage divider. When the resistance is too high, you will see that the 2614 keV pulse does not reach full potentia...
by Steven Sesselmann
21 May 2019, 11:13
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 1304

Re: Fukushima Soil

Hi Guys, Whenever I hear the word impossible, I feel challenged, because nothing is impossible :D I have a suggestion, how about taking a background recording in PRA with a pure Cs137 check source, then run a recording of the Fukushima soil with background subtraction. Possibly the peaks Cs134 will ...
by Steven Sesselmann
20 May 2019, 15:21
Forum: Detector drivers
Topic: GS-USB-PRO Driver question
Replies: 2
Views: 202

Re: GS-USB-PRO Driver question

Conor, I can't comment on the RH counter as I haven't used one, but the analogue output on the GS-USB-PRO is essentially the same as the original GS-1100A and GS-1100-PRO and allows you to connect the analogue signal to a sound card. The same connector also doubles as a right channel input and a TRR...
by Steven Sesselmann
20 May 2019, 07:55
Forum: Spectrum
Topic: Radium Clock
Replies: 4
Views: 302

Re: Radium Clock

Massimo,

Pleased to see you have identified the little Pb210 peak, it was discussed in another post recently.

Steven
by Steven Sesselmann
20 May 2019, 07:52
Forum: Software
Topic: GEIGERBOT for Iphone
Replies: 30
Views: 1077

Re: GEIGERBOT for Iphone

Hi Guys,

I have emailed Nick Dolezal about the email I last had communications with him.

In the mean time check out the other app called Safecast it's identical, but might have been updated.

Steven
by Steven Sesselmann
17 May 2019, 16:22
Forum: General discussion
Topic: Radiodating using NaI(Tl)
Replies: 11
Views: 866

Re: Radiodating using NaI(Tl)

Hi all, I found this web page explaining the Pb210 method, thought it might be of interest to this thread. http://www.flettresearch.ca/UnderstandingPb210.html Pb210 emits a single gamma which makes it easy: http://nucleardata.nuclear.lu.se/toi/nuclide.asp?iZA=820210 It should be possible to detect t...
by Steven Sesselmann
17 May 2019, 10:27
Forum: Introductions
Topic: Greetings from Oregon
Replies: 4
Views: 351

Re: Greetings from Oregon

Hi Addison, Welcome to the forum.. I would give the square detector a miss and look for a NaI(Tl) detector from a seller who is prepared to show you a spectrum taken with the detector. the seller would normally provide a spectrum of Cs137 showing a resolution of 8% or better. I have a whole box full...
by Steven Sesselmann
16 May 2019, 09:35
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 1304

Re: Fukushima Soil

Massimo, In PRA you can read the total net counts in the ROI. To select the R.O.I. you select a bin to the left of your peak and press the "b" key (beginning) then select a bin to the right of your peak and press "e" for end. The ROI should show in yellow. Now along the top of your window you should...