Radon gas
Sir,—l thank Dr McEwan for his reply (May 7), but I do think he glosses over the potential, problem of radon gas in the’ Buller. The uranium deposits Jn the Buller Gorge are contained in the Paparoa Granite formation which extends ; from Kongahu Point in the north to Moonlight Creek in the south. In Britain the worst affected regions are on the fringes of granite areas, particularly where mere are mineshafts and faults in the rock strata. The single house being monitored in the “Westport area” is presumably on the alluvial flat and is unlikely to represent the conditions by the hills in the mining townships of Granity, Seddonville and Millerton. Of course, it is true, as Dr McEwan states, that radon’ can disperse quickly, but the point is that it does not always do so, hence the necessity for a survey in the first place. Ignoring a small high-risk area is rather like doing an albatross census without including Taiaroa Head because it is such a tiny insignificant area really.—Yours, etc., M. GARDNER. May 8, 1987.
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Press, 13 May 1987, Page 20
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179Radon gas Press, 13 May 1987, Page 20
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