A method for estimation of dry mass flow rate in a biological material in an automated procedure, comprising the steps of: conveying the biological material through a measuring station; scanning the biological material conveyed through the measuring station with electromagnetic radiation of at least two different energy levels; determining the amount of radiation transmitted through said biological material at said two energy levels; estimating a wet dry mass flow rate, M_wet; estimating the moisture content, MoistC, of said biological material based on said determined amounts of radiation transmitted through the biological material; and scaling the estimated wet dry mass flow rate, M_wet, in accordance with said estimated moisture content, MoistC, of the biological material, thereby providing an estimate of the dry mass flow rate, M_dry; characterised in that said step of estimating said wet dry mass flow rate, M_wet, comprises: providing radiation transmission values in the form of R estimates, R being R x = ln(N 0x /N x), i.e the natural logarithm of the quotient between a calibrated reference value for the transmission N 0x and the transmission value through the biological material N x at an energy level x; summing, for each of said two energy levels, the radiation transmission values R x over a time frame to summed radiation transmission values RS x; estimating said wet dry mass flow rate, M_wet, based on the summed radiation transmission values RS x for said two energy levels, wherein the estimation of the wet dry mass flow rate comprises a sum of linear components of RS x, and wherein the estimation of the wet dry mass flow further comprises a mixed component, in which the RS x values for said at least two energy levels are either multiplied or divided. conveying the biological material through a measuring station; scanning the biological material conveyed through the measuring station with electromagnetic radiation of at least two different energy levels; determining the amount of radiation transmitted through said biological material at said two energy levels; estimating a wet dry mass flow rate, M_wet; estimating the moisture content, MoistC, of said biological material based on said determined amounts of radiation transmitted through the biological material; and scaling the estimated wet dry mass flow rate, M_wet, in accordance with said estimated moisture content, MoistC, of the biological material, thereby providing an estimate of the dry mass flow rate, M_dry; providing radiation transmission values in the form of R estimates, R being R x = ln(N 0x /N x), i.e the natural logarithm of the quotient between a calibrated reference value for the transmission N 0x and the transmission value through the biological material N x at an energy level x; summing, for each of said two energy levels, the radiation transmission values R x over a time frame to summed radiation transmission values RS x; estimating said wet dry mass flow rate, M_wet, based on the summed radiation transmission values RS x for said two energy levels, wherein the estimation of the wet dry mass flow rate comprises a sum of linear components of RS x, and wherein the estimation of the wet dry mass flow further comprises a mixed component, in which the RS x values for said at least two energy levels are either multiplied or divided.