However, if you would like to hear the DSR-B88 do its stuff and you do not have a source of radioactivity to hand then we can help. We have secured a small number of old gas mantles, which are doped with trace amounts of the radioactive isotope Thorium, to increase luminosity.



Small samples of gas mantle are securely sealed in a plastic test tube. These emit enough radioactivity to generate between 50 and 100 clicks per minute. Each sample tube costs £2.50 and comes with a information and safety leaflet.

You can buy it right here : http://www.rickmaybury.com/bootpages/other/geigerorder.htm