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en.wikipedia.org/wiki/Radioactive_decay

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, gamma ray, or electron in the case of internal conversion. A material containing such unstable nuclei is considered ...

eesc.columbia.edu/courses/ees/lithosphere/labs/lab12/radioisotope_tutorial.html

These isotopes disintegrate to form atoms with stable nuclei by the release of subatomic particles and gamma rays (akin to X-rays). The radioactive elements ... After one half-life has passed, there will remain 50 units of the parent isotope, and 50 units of the daughter product will have been produced. After another half- life, ...

www2.lbl.gov/abc/wallchart/chapters/03/2.html

Aug 9, 2000 ... Beta decay occurs when, in a nucleus with too many protons or too many neutrons, one of the protons or neutrons is transformed into the other. ... If it leads to a more stable nucleus, a proton in a nucleus may capture an electron from the atom (electron capture), and change into a neutron and a neutrino.

www.britannica.com/science/beta-decay

beta decay: Any of three processes of radioactive disintegration by which some unstable atomic nuclei spontaneously dissipate excess energy and undergo a ... In positron emission, also called positive beta decay (β +-decay), a proton in the parent nucleus decays into a neutron that remains in the daughter nucleus, and ...

sciencing.com/list-three-types-radiation-given-off-during-radioactive-decay-21898.html

Apr 25, 2017 ... An atom that gives off radiation has an unstable nucleus; in many cases this means it has too many neutrons. Atoms relieve the ... When an unstable atom gives off gamma radiation, the element remains the same. For example, radioactive barium is still barium after producing gamma rays. Protecting ...

www.dummies.com/education/science/chemistry/the-process-of-natural-radioactive-decay

Certain naturally occurring radioactive isotopes are unstable: Their nucleus breaks apart, undergoing nuclear decay. Sometimes the product of that nuclear decay is unstable itself and undergoes nuclear decay, too. For example, when U- 238 (one of the radioactive isotopes of uranium) initially decays, it produces Th- 234, ...

brilliant.org/wiki/nuclear-decay

Nuclear decay occurs when the nucleus of an atom is unstable and spontaneously emits energy in the form of radiation. The result is ... Neutron - Proton Ratio; Types of Nuclear Decay; Radioactive Disintegration Law; Radioactive Half life; The Manhattan Project; References; References .... The half life remains constant.

www.nuceng.ca/igna/radioactivity.htm

241Am95 à 237Np93 + 4He2. After the emission of an a particle, the daughter product remaining, will be reduced by 4 in its mass number, and 2 in its atomic number, as could be verified in the examples above. Beta (b-) decay occurs when the neutron to proton ratio is too high. The radioactive nucleus emits a beta particle, ...

www.wyzant.com/resources/lessons/science/chemistry/radiation

Generally, all isotopes with an atomic number over 83 are considered radioactive . Because a great amount of energy holds the nucleus together, in a nuclear reaction, a great amount of energy is released as the nucleus is disintegrated: this energy is called the “binding energy.” The term “radiation” refers to the particles ...