According to the news media, the Chinese People's Republic detonated a nuclear device estimated to have a yield between 0.2 and 1 megatons on June 17, 1974. Radioactive debris from this test was observed at the Richland, Washington laboratory on June 24, 1974, approximately seven days after this detonation. The radionuclide levels were extremely low and required 1000-minute counts on our most sensitive instruments for the measurement on air filters. After the initial observation, airborne radioactivity was below our detection limit until June 29, 1974, when it was approximately four-fold higher than on June 24. No further observations of these short-lived radioactive debris were observed through July 17, 1974.
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