+2 positive charge - Alpha, Least ionising - Gamma, Only stopped by thick lead or very thick concrete - Gamma, Slowest speed - Alpha, Stoped by skin or paper - Alpha, Stopped by aluminium or plastic - Beta, Relative mass 4 - Alpha, Moderately ionising - Beta, Negative charge - Beta, High energy electromagnetic wave - Gamma, An electron - Beta, Helium nucleus - Alpha, Tiny (negligible) mass - Beta, Most ionising - Alpha, No mass - Gamma, Travel at the speed of light - Gamma, Least penetrating - Alpha, Deflects most in a magnetic field - Beta, Doesn't deflect in an electric field - Gamma, Most dangerous in the body - Alpha,

P2 Alpha, beta, gamma category

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