The time needed for a radioactive sample to decay to one-half of its original activity is called the ________.
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Q70: The radioisotope used as a diagnostic tool
Q71: When a positron is emitted,the atomic number
Q72: X-rays are generated by the nucleus during
Q73: The production of nitrogen-13 and a neutron
Q74: After two half-lives,the radioactivity of a sample
Q76: The diagnostic imaging technique that depends on
Q77: Exposure to radiation is unavoidable because some
Q78: When beta particles are emitted,the atomic number
Q79: The combination of H-3 and H-2 to
Q80: The correct symbol for hydrogen-3 is
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