Habits Survey
In order to assess the impact of radioactive discharges on the public, SEPA needs to identify the individuals or groups of people that may be exposed. We therefore undertake a habits survey to identify 'critical groups'. SEPA monitor 'critical groups' of people who are likely to receive the highest radiation dose because of where they live and what they do. For example, someone who lives near a nuclear site and eats local shellfish may be part of a critical group. The results of the habits survey are then used to inform SEPA's monitoring programme.
SEPA assesses the dose received by the critical group and compares it with statutory dose limits. If the dose is within statutory limits, it follows that the doses to other members of the public will also be within these limits.
To find out which people are in a critical group, SEPA undertakes a habits survey. Researchers interview local residents, food retailers, fishing managers and farmers, observe habits at particular locations (eg beaches) and take measurements of radioactivity. The research also takes into account the following factors:
- angling, commercial fishing (netting and creeling) and mollusc collection
- production, use and destination of local produce
- types, seasonality and consumption of local wild foods
- land use and soil types
- occupancy near the site
- local food consumption rates
- any extraordinary (unusual) practices.