Search found 82 matches

by cicastol
18 Jul 2020, 00:33
Forum: General discussion
Topic: Instrument cables.
Replies: 11
Views: 1201

Re: Instrument cables.

kotarak wrote:
17 Jul 2020, 01:18


I wonder if this causes the difference in plots when cables are directly swapped without re-calibration?
Yes, higher capacitance smoothens too much the pulse, i also had used the Thermax RG400 2 years ago, switched for a 75Ohm lower capacitance Radiall KX6A .
by cicastol
16 Jul 2020, 01:18
Forum: Spectrum
Topic: Gummite, Uranium Ore from Australia
Replies: 5
Views: 396

Re: Gummite, Uranium Ore from Australia

According to the seller this sample was hot enough to give a dose rate at contact of 5 μSv/h, but that was actually an overestimation, we are more in the region of 1 μSv/h, as can be read in the PDS display that I used to record a preliminary 2 hour spectrum just to get a sense of what to exptect. ...
by cicastol
15 Jul 2020, 23:08
Forum: Spectrum
Topic: Gummite, Uranium Ore from Australia
Replies: 5
Views: 396

Re: Gummite, Uranium Ore from Australia

Excellent work as usual Massimo! I learn a lot from the spectra you share along with your process and equipment details. Please keep sharing. According to the seller this sample was hot enough to give a dose rate at contact of 5 μSv/h, but that was actually an overestimation, we are more in the reg...
by cicastol
14 Jul 2020, 05:23
Forum: Detectors
Topic: Bad 3x3? or is it just me?
Replies: 14
Views: 614

Re: Bad 3x3? or is it just me?

Mike S wrote:
14 Jul 2020, 00:51

Any ideas why I'm getting such poor resolution and low counts?

Thanks!

Mike S.
With a proper working 3x3 you should expect at least 500cps in normal background, as Tom said check the VD pinout , for sure the is something wrong somewhere !
Voltage for the above spec was set at 800V
by cicastol
13 Jul 2020, 19:38
Forum: Detectors
Topic: Bad 3x3? or is it just me?
Replies: 14
Views: 614

Re: Bad 3x3? or is it just me?

Hi Mike, i have an identical spare 3x3 detector from Bicron, first of all you need a VERY good shield to use this detector with sound card based software MCA like PRA or Theremino, because count rate is reallly too high with such big detectors, IMHO at least 30:1 or better background unshielded/shie...
by cicastol
11 Jul 2020, 21:51
Forum: Shielding
Topic: Updside/Downside to Plastic Inner Layer?
Replies: 2
Views: 217

Re: Updside/Downside to Plastic Inner Layer?

I've seen some shield designs that use plastic inner layers either intentionally to absorb low energy x-rays, or as mechanical components of the shield design. I've got a few questions about the practice, since I'm using a plastic core for my current shield and wondering which direction to go for f...
by cicastol
10 Jul 2020, 06:14
Forum: Spectrum
Topic: Trinitite - 28 Day Gamma Spectrum - To Barium or not to Barium?
Replies: 8
Views: 564

Re: Trinitite - 28 Day Gamma Spectrum - To Barium or not to Barium?

We are playing with low resolution detector, even with good energy calibration, under 100keV are nowhere linear and resolution is quite horrible as a well known behaviour stated many times before. Even in Pittauerova works with HPGe Ba133 lines they just barely emerges from Pb Ka/Kb x-rays lines in ...
by cicastol
26 Jun 2020, 02:19
Forum: Shielding
Topic: Modular Lead Shield for 2" detectors
Replies: 13
Views: 7651

Re: Modular Lead Shield for 2" detectors

I have seen a peak around 30 with all my Fiestaware and U glass spectrums and have racked my brain trying to figure out what it was. Now I know. Iodine x-rays. Thanks! No, it isn't the iodine x-ray, normally, under 200keV in the photoelectric effect region, the Ka1 28.6 keV x-ray line of the Iodine...
by cicastol
30 May 2020, 00:48
Forum: Detector drivers
Topic: Gamma spectacular + Red Pitaya = Nuclear Dragon fruit?
Replies: 5
Views: 1014

Re: Gamma spectacular + Red Pitaya = Nuclear Dragon fruit?

Nice Conor, well done!

I think using "real" high speed ADC boards like Red Pitaya is the way to go to get results like pro system.
by cicastol
27 Apr 2020, 05:31
Forum: Spectrum
Topic: Beach sand, Vromos bay (Bulgaria)
Replies: 17
Views: 4460

Re: Beach sand, Vromos bay (Bulgaria)

R0B0T wrote:
13 Jan 2020, 16:20
This is Vromos Beach



Is 0.20 MSv dangerous? How dangerous can it be??

Hi, it's 0,20 uSv NOT 0.2MSv !!

0,2uSv is safe level :-)