The equipment being used to count radioactivity in the video is most probably a "spark counter".
Here is another video link showing how a spark counter operates.
http://www.mefeedia.com/watch/48220907
The video includes demonstrations that alpha radiation is completely absorbed by a few centimetres of air or even a single sheet of paper. Thorium releases minute quantities of alpha radiation.
The concentrate produced by Lynas contains very low levels of thorium, so low that it is not classified as a radioactive material either in Australia or in Malaysia. This thorium is not concentrated at all by the chemical separations used in the LAMP.
radiation benchmark , page-7
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