Beta decay | Physics | Khan Academy 

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During beta minus decay, a neutron in an unstable nucleus transforms into a proton, releasing a high energy electron and antineutrino in the process. During beta plus decay, a proton in an unstable nucleus transforms into a neutron, releasing a high energy positron and neutrino in the process. Beta particles carry away energy lost by the nucleus and are ionizing radiation.
00:00 - Intro
00:12 - Alpha and beta decay
01:12 - Beta minus decay of carbon-14
04:44 - Beta plus decay of nitrogen-13
07:47 - Neutrinos and antineutrinos
09:09 - Charge conservation
10:14 - Beta decay penetrating power and application
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