This DSIR booklet included instructions on how to make a cheap Geiger counter. For several years enthusiasts used their own counters, hoping that the ticking would suddenly speed up, indicating radioactivity. This sound file illustrates what happens when a radioactive source is gradually brought closer to the counter.
Using this item
Te Ara - The Encyclopedia of New Zealand
Reference: L. I. Grange, Prospecting for radioactive minerals in New Zealand. DSIR Information Series 8. Wellington: New Zealand Geological Survey, 1956
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