High-energy electromagnetic radiation emitted by certain radionuclides
when their nuclei transition from a higher to a lower energy state. Gamma rays have
high energy and a short wave length. All gamma rays emitted from a given isotope
have the same energy, a characteristic that enables scientists to identify which
gamma emitters are present in a sample. Gamma rays penetrate tissue farther than
do beta particles or alpha particles, but leave a lower concentration of ions in
their path to potentially cause cell damage. Gamma rays are similar to x-rays.
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