Gamma Spectrometry Forum

Hello Luuk,
I wish you all the best. I enjoyed your posts over the years and need to say "there are not many of your kind" unfortunatelly!
Regards from Germany,
Martin

HI, I do not know if it was clear from my first post with the table that it allows to easily calculate the shape factor of any sample. Just draw the shape over the table (which is 1mmx1mm resulution) calculate the average of all marked fields. That is the resulting factor or your probe. Doing so you...

Hello Peter, thank you, but please not that this formula is for GM tubes not scintillators. There is simulation software available but no results for the 38B57 type. As I did measure the field already I can measure samples with any small shape and distance already. Anyone with the same sensor may us...

Hello Lodovico, thank you for your response and *wow* good essay on physicsopenlab. Regarding your formula: Ax = A ( πr2 / 4πd2 ) fγ ε the geometric factor is given as ( πr2 / 4πd2 ), but I'd say it is only valid for larger distances. At least in my case for food analysis (but as your soil sample is...

Hi again, Ok, again my fault: the spurious peaks resulted from limitations of my sound card input (depending on the gain needed which depends on the voltage) and not the detector or GS1100Pro. I need to go lower than 650V to get the 2614.8keV peak Ti208 properly with enough headroom to clipping due ...

Hello Luuk and/or Steven, regarding supply voltage: it is not that easy as described in other posts here. At the beginning I made the mistake that the line in voltage of the card (I am using a fireface UC interface that provides superior signal/noise level) was too high/saturated and hence the spect...

I'd be interested in getting some calibrated low radiation (EU conform source).
Anyone in Europe interested to sell it (maybe because there is no need anymore)?
Best,
Martin

Hi P ;-),
I did setup an efficiency field for my 38B57.
Efficiency (radius from middle 0...20mm, distance 0...100mm.
Is that something you like to match with your calculations?
Best,
Martin

Thanks you for the response, I like to prepare some input but need more time.
@Peter: If you are interested to get in contact with me just send me a PM.

Hi folks, my initial goal when stepping into gamma spectrometry was to make quantitative measurents of Cs137 in food samples (mushrooms). Actually, it was harder than expected. I got a 38B57 tube and a GS-1100 Pro together with theremino MCA. At the end I think I did it and would like to share the r...