PHYS 1070 Lecture Notes - Lecture 24: Gamma Ray, Beta Decay, Beta Particle
25 Mar 2015
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Phys1070: intro physics for life sci - lecture 24: radioactive decay: alpha, beta and. Every parent nucleus of a given type has the same probability ( p) to decay in the next interval of time ( t), regardless of how long that nucleus has existed. P is the physical decay constant with units of [time]-1, ie. s-1, days-1, years-1. If t is small compared to the half-life, then the number of parent nuclei that decay must be proportional to both t and n. N=- pn t (negative because the number of parent nuclei are decreasing with time) (1) electron emission beta decay (negative) - we focus on this one. Is the emission of a beta particle, which is just an electron (symbol -1e) and another particle (called an antineutrino), from the nucleus. The energy released in the decay (typically a few million evs) becomes the kinetic energy. 87fr + 0 of the beta particle and the neutrino.
