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13 Cards in this Set
- Front
- Back
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A unit of exposure that measures ionization in air by X-rays and gamma rays
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roentgen
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A unit of exposure that measures absorbed energy or absorbed dose
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rad (radiation absorbed dose)
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A unit of measure that measures effective dose, dose equivalent, and effective dose equivalent
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rem
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A unit of measure used to describe the exposure of populations to radiation
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person-rem
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Atoms with the same atomic number, but with different atomic weight
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isotopes
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A particular radioactive isotope of an element
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radionuclide
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The time it takes for half the atoms in a pure sample of radionuclide to transform through radioactive decay
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half-life
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The rate at which radioactive decays are occurring in a given sample of a radionuclide at time t
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activity
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Electromagnetic and charged or uncharged particulate radiations that are capable of directly or indirectly producing ions by interaction with matter
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ionizing radiation
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A high-energy electron emitted by radionuclides of low mass number and carrying a single negative charge
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Beta particle
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A high-energy electromagnetic radiation that can penetrate solids and ionize gas. It has a wavelength between 0.01 and 10 nanometers
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X-ray
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A high-energy photon emitted after nuclear reactions or spontaneously from the nucleus of a radioactive atom that lowers the energy level of the nucleus. It does not carry any electric charge or mass and is at the high-frequency end of the electromagnetic spectrum
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Gamma ray
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A particle consisting of two neutrons and two protons that is identical to the helium nucleus and is emitted during some radioactive transformations
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Alpha particle
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