Youre assessing the safety of an airport bomb-detection system in which neutron activation of the stable nitrogen

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You’re assessing the safety of an airport bomb-detection system in which neutron activation of the stable nitrogen isotope 157N turns it into unstable 1157N. The N-16 decays by beta emission with 7.13-s half-life. How long after activation will the N-16 activity have dropped by a factor of 1 million?

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Essential University Physics

ISBN: 978-0321976420

3rd Edition Volume 2

Authors: Richard Wolfsonby

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