Hi,
Regrettably, I do not have suitable calibration source at home, since it is not allowed in our country. But I'm going to take a look to statutory regulations, whether there is something like exempt quantity, or take my gamma spectrometer to the Faculty of Millitary Health Sciences, where such source is available. Would be interesting to calibrate my gamma spec for quantitative measurements. However, even with available disc source (point source) it would be tough task, since my setup used for soil measurement is really far from point source geometry, so some corrections would be needed. The best option would be to use the same approach as
Carl Willis, who used liquid solution with known activity of Cs-137 and spiked blank soil sample, which was farther used for calibration in the identical geometry as unknown samples. But especiall in this case I would expect the SWAT visit, knocking on our doors very quickly.
According to the map which I referred at my
blog, surface activity at the place, where I took the soil sample was in order of 60 kBq/m2 in 2016.
If you would be intertested and able to send me aproximatelly 300 g of sieved soil without stones and biological debris, I can measure it and compare resulting data with the measurement from Austria and from our country. BTW I've just finished measurement of a soil sample from northern part of the Czech Republic. Contamination there reaches the level of the Austrian sample, so if anyone would be interested I can send it for measurement and comparison as well.
