Radioactivity

nuclear reaction splitting an atom into multiple parts

French physicist (1852–1908)

electromagnetic radiation of high frequency and high energy

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particle of alpha radiation; helium-4 nucleus; particle of two protons and two neutrons

technique based on carbon-14 decay to determine the age of organic materials

therapy using ionizing radiation

radiation that carries enough energy to liberate electrons from atoms or molecules

process in which two nuclei collide to produce one or more nuclides

emmision of beta particles by a decaying radioactive atom

high-energy, high-speed electron or positron emitted during beta decay

The sievert (symbol: Sv) is a derived unit in the International System of Units (SI) intended to represent the stochastic health risk of ionizing radiation, which is defined as the probability of causing radiation-induced cancer and genetic damage. The sievert is important in dosimetry and radiation protection. It is named after Rolf Maximilian Sievert, a Swedish medical physicist renowned for work on radiation dose measurement and research into the biological effects of radiation.

thumb|Chart of known nuclides . The vast majority are radionuclides.

SI unit of absorbed dose of ionizing radiation

emission of alpha particles by a decaying radioactive atom

waste containing radioactive material and emitting ionizing radiation

non-SI unit of radioactivity

scientific device

process in which a proton-rich nuclide absorbs an inner atomic electron

smallest amount of fissile material needed for a sustained nuclear chain reaction

thumb|The Globally Harmonized System of Classification and Labeling of Chemicals|international pictogram for chemicals that are sensitising, mutagenic, [[carcinogenic or toxic to reproduction]]

emission of subatomic particles by the decay of an atomic nucleus

thumb|Glovebox

conversion of one chemical element or an isotope into another chemical element

series of elements in radioactive decay

number of protons or neutrons that make a nucleus particularly stable

region of the chart of the nuclides containing isotopes of super-heavy elements theorized to be much more stable than others

form of radioactive decay found in very heavy chemical elements

level of ionizing radiation present in the natural environment

radioisotope that is man-made and is not found in nature

decay where a neutron is ejected from the nucleus

radioactive decay in which a proton is converted into a neutron while releasing a positron and a neutrino

fast-moving particles with energy

radioactive decay process wherein an excited nucleus interacts electromagnetically with one of its electrons, causing it to be ejected from the atom

enclosed space specially designed to protect occupants from radioactive debris or fallout

radioactive decay where a proton is ejected from the nucleus

chemical compound

decay mode

device that emits neutrons

secondary electron with enough energy to escape a significant distance away from the primary radiation beam and produce further ionization

element that is found in small quantities because it undergoes radioactive decay

thumb|200px|right|A low quality toy spinthariscope taken from a 1950s Chemcraft brand "Atomic energy" chemistry experimentation set thumb|A spinthariscope crafted by Robert Drosten in Belgium in 1905 and used in the University of Mons Faculty of Engineering ("Polytech Mons") at the beginning of the 20th century. A spinthariscope () is a device for observing individual nuclear disintegrations caused by the interaction of ionizing radiation with a phosphor (see radioluminescence) or scintillator.

quantitative study of the energy spectra of gamma-ray sources

decay mode

kinetic energy released per mass

nuclear decay in which an atomic nucleus emits a small cluster of neutrons and protons

state of a nuclear reactor where the nuclear chain reaction is precisely self-sustaining

isotopes that are produced by interaction of cosmic rays with the nucleus of the atom

use of gaseous tritium to create visible light

proportion of a nuclear or particle decay going to a given decay mode

nuclide produced by radioactive conversion from other nuclide

1938 achievement in physics

US company

formula used to calculate nuclear chain reaction growth rate

Portuguese writer (1899-1986)

nuclear battery concept

radionuclide which emits ionizing radiation

Bulgarian physicist (1897–1968)

a graphical presentation of all the transitions occurring in a decay of a radioactive substance