A radioisotope placed near a radiation detector registers 80 counts per second. Eight hours later the detector registers 5 counts per second. What is the half-life of the radioisotope?

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The Answer of A radioisotope placed near a radiation detector registers 80 counts per second. Eight hours later the detector registers 5 counts per second. What is the half-life of the radioisotope?

A Radioisotope Placed near a Radiation Detector Registers 80 Counts