30-8 Half-Life and Rate of Decay N = -l N D t l Is called the decay constant. Half-life it the time for half of the radio-active nucleus to decay. Radioactive decay law….equation 30-4 DN= No e -lt . DN is number of decays that occur in time t. No is the number of radioactive nuclei present The precise relationship between half-life and decay constant is T1/2 . = .693/ l. 30-6
10-9 continued • See Example 30-7 and 30-8
30-10 Decay Series • See chart on page 933
30-11 Radioactive dating • Using this very accurate ‘clock’ you can determine how much isotope has decayed and determine the age of a radioactive nucleus/element.
30-13 Detection of Radiation • Geiger counter • Scintillation counter • Photo ID
Ch 30 TXTHW 30B • P 941 35-40