ECON 1 Lecture Notes - Lecture 13: Alpha Decay, Beta Decay, Atomic Nucleus
Document Summary
Stable isotopes if an atom as the same number of protons, they are the same element. They differ in the number of neutrons; isotopes: the masses in the periodic table are average masses of isotopes, difference in masses due to binding of protons in nucleus. In beta decay, neutrons are converted to protons by emitting a negative electron and an antineutrino. Old unit: curie 3/7x1010 disintegrations/s = 1 ci (1g of ra: absorbed radiation. New unit: gray 1 j/kg = 1 gy. Old units: radiation adsorbed dose 1 rad = 0. 01 gy: biological damage. New unit: sievert 1 gy x factor = 1 sv. Old unit: radiation equivalent in humans 1 rem = 1 rad x factor. Half life: decay happens at a specific rate, half the life span- half the amount you start with. Radioactive decay: you can predict radioactive decay using logarithms, e. g. ln[131i] = 2. 9957 0. 0866t, eln e= e 7. 98 .
