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The methods to determine the absorbed dose to water for low and mediunm energy photons were studied. Large differences between the results of these methods exists. So, a research proposition has been made to explain these differences. The goal of the research will be the development of a method to determine the absorbed dose below approximately 400 keV with an ionisation chamber calibrated an 60 Co gamma radiation. To explain the differences between the set of methods, some methods, some causes were proposed, like the influence of the ionisation chamber on the measurement in water. Also, some methods to determine the factors are proposed.