atom - smallest particle of an element, nucleus - center of an atom where the mass is concentrated, alpha - type of particle with 2 protons and 2 neutrons, beta - type of particle with a fast moving electron, gamma - type of radiation that is a wave, not a particle, radiation - energy that travels in the form of particles or waves, isotopes - atoms of the same element with different numbers of neutrons, halflife - the time for the count rate of a radioactive element to halve, irradiated - exposed to radiation, neutron - uncharged particle found in the nucleus of an atom, proton - positively charged particle found in the nucleus of an atom, electron - negatively charged particle that orbits the nucleus, becquerel - unit of measurement for rate of radioactive decay, activity - refers to the rate of decay of an unstable nucleus, countrate - detected by Geiger-Muller tube, the number of decays detected per second, ionisation - when radiation knocks electrons out of atoms,

Radioactivity keywords

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