Radiation

The nucleus of an atom contains

• electrons

• protons

• protons and neutrons

• neutrons

Radioactive decay is when

• An unstable nucleus gives out radiation to become more stable

• A stable nucleus gives out radiation

• A nucleus takes in radiation

• A stable nucleus becomes more unstable

Activity is the rate at which nuclei decay. It is measured in

• metres

• joules

• becquerels

• newtons

Alpha radiation is where a nucleus emits (gives off)

• A beta particle

• An electron

• 2 protons and 2 neutrons (a Helium nucleus)

• a neutron

In beta radiation beta particles are emitted. These are

• helium nuclei

• neutrons

• high speed electrons

• high speed electrons given off when a neutron turns into a proton

Gamma radiation is where

• electromagnetic radiation is emitted from the nucleus

• electrons are emiitted from the nucleus

• protons are emitted from the nucleus

• nothing is emitted from the nucleus

alpha particles are stopped by

• paper

• aluminium

• lead

• kryptonite

beta particles are stopped by

• paper

• aluminium

• lead

• salt

gamma radiation is stopped by

• paper

• aluminium

• lead

• plastic

Which is the most ionising type of radiation? (can do the most damage to cells)

• gamma

• alpha

• beta