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A geiger counter registers a count rate of4,000 counts per minute from sample of a radiosotope. twelveminutes later the count rate is 1000 counts per minute.what is thehalf-life of the radiosotope?

An accident in a laboratory results in a room being contaminated by a radiosotope with a half-life of 3 days. ifthe radiation is measured to be eight times the maximum permissiblelevel, how much time must elapse before the room is safe to enter?

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