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A geiger counter registers a count rate of 4,000 counts per minute from sample of a radiosotope. twelveminutes later the count rate is 1000 counts per minute. what is the half-life of the radiosotope?

An accident in a laboratory results in a room beingcontaminated by a radiosotope with a half-life of 3 days. if the radiation is measured to be eight times the maximum permissible level, how much time must elapse before the room is safe toenter?

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