Gamma Spectrometry Forum

Rough activity estimation is 2285+-457Bq/Kg, but the density is very different (almost half) from the soil I had previously calculated, so I don't know how actual it can be...

Thanks,
sample weight is 248Gr of compressed ash in a 0,6Lt Marinelli becker , i need to make some calculations to estimate the activity, but i guess is under 1000Bq/Kg .

During winter i'm running a pelletized wood stove , my pellets came from Lithuania and Cs137 (always presents Chernobyl NPP fallout) in ash becomes concentrate at 10 to 200 ratio , here a brief results from 32Ks integration time.

Now it really stand up!
30 days integration should be taken as a new World record guiness :-)

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 .

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. ...

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...

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

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...

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...