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3.10 Site characterisation: Data interpretation and drawing conclusions

The types of measurements that can be made in a survey unit are:

  • Direct measurements at discrete locations;
  • Samples collected at discrete locations;
  • Survey scans.

Radiation survey data are usually obtained in units, such as the number of counts per unit time, that have no intrinsic meaning relative to derived concentration guideline levels (DCGLs). For comparison of survey data to DCGLs, the survey data from field and laboratory measurements should be converted to DCGL units. This section describes methods for converting survey data to appropriate units for comparison to radiological criteria.