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But newsmen at Trinity last week could not leave their cars at the crater's rim without first donning canvas overshoes to protect themselves against burns from radioactive material which might lodge in their shoes. Scientists with radiometers like long-lensed cameras found several "hot spots" near the inner crater's edge, warned others to stay away. Reporters who enthusiastically pocketed souvenir bits of crater glass had second thoughts when someone recalled the effects of radiation on fertility. The radiometers proved that some of the souvenirs were actually still dangerous.