[en] Radiation protection for practices should be based on justification of exposure, optimization of protection and dose limitations. The 96/29 European Union directive clearly requires that operational protection of exposed workers shall be based on prior evaluation to identify the nature and magnitude of the radiological risk to exposed workers and implementation of optimization of radiation protection in all working conditions. Operational protection of exposed workers requires the implementation of measures at workplaces. The ICRP60 publication (1991) defines and recommends the use of the effective dose E for radiological protections purposes. This quantity can not be directly measured; the operational quantities ambient dose equivalent: H and personal dose equivalent: Hp as defined in the ICRU 51 report (1993) are recommended to estimate the effective dose E. These operational quantities are related, through calculated conversion coefficients h_Φ, to the measurable function fluence Φ by: H = ∫ h_Φ (E) Φ_E dE (1a); Hp = ∫ hp_Φ (E, Ω) Φ_E,_Ω dE dΩ (1b). Φ_E (Φ_E,Ω) is the distribution of the fluence with respect to energy (energy E and direction Ω); h_Φ or hp_Φ are the fluence to operational quantity conversion coefficients as defined by the ICRU 57 report (1998)