I got this plastic in the summer called Tastrak. It is supposed to get scarred by alpha particles when radon gas is released from rocks underground. It turns out that the limestone rocks around Sandale and Caldbeck are supposed to be medium bad for radon, so I gave a piece to someone I knew to test it. Nothing!So last Saturday I hid a piece at Sandale Quarry. I'll collect it in a couple of weeks. You need a microscope to see the marks.
