Expert at uranium site finds no substance to Greens MLC's radiation claims

An expert has carried out a radiological survey at Lake Way near Wiluna and found little substance to claims by Greens MLC Robin Chapple that the site was not adequately rehabilitated after uranium exploration in the 1970s.

Mines and Petroleum Minister Norman Moore said the survey - carried out by a qualified Radiation Safety Officer using properly calibrated equipment - was completed yesterday (Wednesday, July 21).

"The survey found background radiation levels consistent with an area known to have naturally occurring near-surface and outcroppings of uranium ore," Mr Moore said.

"Further, the survey results indicate that background radiation levels at one metre above ground level - which is the recognised height to take such readings - did not exceed approximately one microSieverts per hour. Readings at most sites were less than 0.5 microsieverts per hour.

"By comparison, typical background readings in the Perth hills would be around 0.6 microSieverts per hour because of the granite in the Darling Scarp.

"The levels can be compared with activities such as air travel, where exposures in the order of one to five microSieverts per hour are common, depending on the altitude reached.

"Photos of Mr Chapple published on one of the news websites clearly show him taking readings at the surface directly from a rock that appears to be uranium ore. I am advised that this is not the right way to take radiation readings.

"Qualified staff from the Department of Mines and Petroleum will be happy to teach Mr Chapple the proper techniques to carry out radiological surveys should he wish."

The Minister said Mr Chapple and other Greens had made similar claims about the area in 2000. Subsequent rehabilitation was undertaken at that time to the satisfaction of the Radiological Council and the State Mining Engineer.

"Mr Chapple's most recent claims about high radiation and failed rehabilitation are alarmist, irresponsible and baseless to say the least," Mr Moore said.