Radiation-the risks and uses Radiation part 2 3.0 / 5 based on 3 ratings ? Science in SocietyASAQA Created by: TallyCreated on: 09-05-10 12:38 What is the activity of a radioactive source measured in? becquerels 1 of 9 What is meant by a half life of 100 000 years? after 100 000 years the ammount of radioactive atoms halves 2 of 9 What is a cohort study? when scientists compare a sample exposed to a factor with a control group that isnt exposed to the factor 3 of 9 We tend to over-estimate the risk of unfamiliar activities relative to everyday ones. true or false? True 4 of 9 What is measured in sieverts or millisieverts? the effective dose of radiation 5 of 9 Radioactive substances be moved around the environment by rain water. true or false? True 6 of 9 What is the difference between irradiation and contamination? a source of radiation inside someone can irradiate them whereas if a source of radiation is inside a person, they are contaminated 7 of 9 What source of radiation are we most exposed to? radon gas from the ground 8 of 9 What is meant by saying a subsatnce is radioactive? its an atom with an unstable nucleus 9 of 9
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