decays - Types of Radioactive Decay type alpha () decay...

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Types of Radioactive Decay type example notes alpha ( α ) decay 23 9 8 2 U 6 4 2 He + 23 9 4 0 Th + 2 0 0 γ ! α particle = 4 2 He nucleus (i.e., 4 2 He 2+ ) beta ( β - ) decay 23 9 4 0 Th 6 ! 0 1 e + 23 9 4 1 Pa ! β - particle = ! 0 1 e (an electron) ! energy released in decay process creates the β - particle (not from an orbital) ! net effect: convert neutron to proton ! β - particles likely to be produced by nuclides with high neutron-to-proton ratios positron ( β + ) decay 3 1 8 9 K 6 0 1 e + 3 1 8 8 Ar ! β + particle = 0 1 e (a positive electron) ! β + is "antiparticle" of β - ! net effect: convert proton to neutron ! β + particles likely to be produced by nuclides with low neutron-to-proton ratios electron capture 19 8 5 0 Hg + ! 0 1 e 6 19 7 5 9 Au ! an inner-orbital electron captured by nucleus
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