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I have been visiting this site for years studying the radiation. It comes from radon gas which is in so high concentrations in the chamber that it can even be measured with a geiger counter. It is generally accepted that radon cannot be measured with a geiger counter, and perhaps radon gas itself cannot, but it decays into decay products which are themselves radioactive and can be measured with a geiger counter at concentrations exceeding about 5,000Bq cubic metre (compare with government action level of 200). We have measured it with a range of more sophisticated equipment, but for those without more sophisticated equipment, if you sit half an hour in the chamber breathing the air, your nostrils will register on a geiger counter - DON'T panic! The radioactive radon decay products are short lived and will decay to low levels in a couple of hours.
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