Page 4. Beta decay is a radioactive process in which an electron is emitted from the nucleus of a radioactive atom, along with an unusual particle called an antineutrino.The neutrino is an almost massless particle that carries away some of the energy from the decay process.age 4. Beta decay is a radioactive process in which an electron is emitted from the nucleus of a radioactive atom, along with an unusual particle called an antineutrino.
There is also a 12-hour extended-release form of pseudoephedrine; it should also start working within half an hour of taking your first dose, but will last much longer. Because it can last up to 12 hours, remember that you should not take more than two tablets in a 24-hour period.
For example: 1  monophasic 21-day pill â you take a combined pill for 21 days, followed by seven days without pills, when you have a bleed. 2  To delay your period, start a new packet of pills straight after you finish the last pill and miss out the seven-day break. 3  everyday (ED) pill â you take a combined pill every day.