Relative doses instead of relative concentrations for the determination of the consequences of the radiological atmospheric releases.

Radiological atmospheric releases require population dose calculation for proper determination of preventive measures. The old concept of relative concentrations requires long lasting constant emission which is not realistic. The proposed concept of the "relative doses" is the generalization and expansion of the known concept of relative concentrations. Relative doses allow an evaluation of the general non-stationary pollutants emission under the real weather conditions over complex terrain. Relative doses can be calculated even before the actual source term - quantified emission - is known. The relative impact is also very useful for considering the possible impact of an accident scenario on the surroundings for various meteorological situations. This is applied for environmental impact assessments which require long term statistical evaluation. The method has a practical possible application for realistic dose assessment of effectiveness of additional protection achieved by installation of Passive Containment Filtered Venting Systems (PCFVS). PCFVS is considered an obligatory safety upgrade after the Fukushima accident.