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define isotopes
atoms of the same element with varying numbers of neutrons
alpha particles
heaviest non-isotope particle, penetrate tissue the least (piece of paper can block) 4/2He²+
beta particles
essentially electrons, much smaller than alpha particles, penetrate tissue medium (thick clothing will stop) 0/-1B
positrons
anti-matter, positively charged electrons, penatrate tissue the same as B particles 0/+1B
Gamma rays
high energy, most tissue penetration (concrete walls needed to stop) 0/0Y
Define half-life
the amount of time for half of a radioisotope to decay