Attenuation factor (parameter F)
F = FI x F2 x F3
______________________________________________________
Technology Parameter F
______________________________________________________
Roof over storage site F1
- absent 1.0
- rigid, permanent 0.7
- temporary (layer of peat, 0.9
plastic cover)
Ventilation F2
- natural and forced with multiple 1.0
air outlets
- forced with grouped air outlets and 0.9
air outlets above roof
- forced with grouped air outlets with 0.8
air washer or biological filters
Other technologies F3
- new technologies may be used to Factor to be
reduce distances when their determined upon
efficiency has been proven accreditation
______________________________________________________