METHOD AND APPARATUS FOR ESTIMATION OF HEAT VALUE

A method for estimating a heating value of a biological material is disclosed. The method comprises: correlating amounts of radiation transmitted through a number of different reference materials， said radiation being electromagnetic radiation of at least two energy levels， with heating values for said reference materials obtained by calorimeter measurements; irradiating the biological material (102) with electromagnetic radiation of said at least two different energy levels;and measuring the amount of radiation (109a-c) transmitted through said biological material at said energy levels. The method further comprises determining， for each energy level， a transmission value through the biological material based on the radiation through said biological material; and determining， based on said determined transmission values and said correlation， an estimate of the heating value of said biological material. A corresponding apparatus (100) is also disclosed.