Half life is a term used to describe
a) The penetrating ability a gamma source
b) Half the total time a gamma source will be useful
c) The time taken for the gamma source to reduce the strength by half
d) The rate of decay of an X-ray tube
a) The penetrating ability a gamma source
b) Half the total time a gamma source will be useful
c) The time taken for the gamma source to reduce the strength by half
d) The rate of decay of an X-ray tube