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radioactive crossword

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Across
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Time it takes for half of the original sample to decay
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Atoms of the same element with a different number of neutrons
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A rotary machine that extracts energy from a fluid flow
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Non-radioactive
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A radiation absorbed dose
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An unstable isotope
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The number of protons in an atom
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Is an electron
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The sum of the protons and neutrons
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The center of an atom containing protons and neutrons
Down
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Combining two smaller helium nuclei to get energy
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A collection of atoms that all have the same number of protons
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Splitting a uranium nucleus in to two smaller nuclei
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Controls the rate of fission
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A helium nucleus
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A device that stores and puts out energy
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Electra radiation
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A nucleus formed by the radioactive decay of a different parent
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A radioactive nucleus that decays to another nucleus
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The accidental release of radioactive materials