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radioactive crossword

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