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Examples
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This idea had been earlier advanced, but not demonstrated, by Sir Oliver Lodge and other students in the new field of radio-activity.
Chapter 1: My Eagle 2010
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"Past experience shows clearly that mine workers put their health and their lives at risk, when working in conditions of radio-activity which are far above World Health Organisation standards," the organisation's spokeswoman Liz McDaid said in a statement.
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Van Vliet said about 100 places where radio-activity was likely to be present because of mine activity and geological factors had been selected for tests.
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International criteria for acceptable radio-activity levels in drinking water had been used because South Africa had not yet developed its own norms, van Vliet said.
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Fourie said it was too early to draw any conclusions about the levels of radio-activity in water sources around mines.
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High levels of radio-activity have been found at four places in rivers and streams on the West Rand and the Free State gold fields, according to a government study.
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Water boards also regularly tested for radio-activity in drinking water.
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Affairs said it recently initiated a survey on the presence of radio-activity in South Africa's water resources.
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Van Vliet said the department would also involve water boards and other concerned parties in follow-up action which would include devising South African criteria for radio-activity in drinking water.
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Van Vliet, who heads the department's institute for water quality studies, stressed that drinking water used by municipal consumers on the West Rand and the Free State did not originate from the surface water where high levels of radio-activity had been found.
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