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| Pregunta | Respuesta |
| There are three types of Radiation: Alpha, Beta and Gamma. The activity of a substance is measured in Becquerals. | All three of these are harmful to human cells and can cause cancer if exposed for too long. |
| Alpha particles are Helium nuclei. They are positively charged and are a product of alpha decay | These particles have the highest ionising power. Despite this, they have the shortest range, and fail to penetrate even paper. |
| Beta particles are electrons that are the result of a neutron splitting into a proton and an electron, and are negatively charged. | Beta particles have an average ionising power, as well as an average range. These particles are stopped by aluminium. |
| Gamma comes in the form of waves, rather than particles. As a result, they have no charge. | Gamma radiation has the smallest ionising power, however has the longest range, only being stopped by thick lead. |
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