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In the area of radiation protection in radiology and nuclear medicine it is common practice to use adult human phantoms to simulate average humans for the assessment of organ and tissue absorbed doses. However, most patients do not have body heights and/or body weights of the average human, which can lead to significant errors for organ and tissue absorbed doses to be determined for a specific patient. In a special phantom development project at the Departamento de Energia Nuclear of the Universidade Federal of Pernambuco, 32 adult human phantoms, 16 for each sex, will be designed to cover a certain range of body heights and body weights, to be used in organ and tissue absorbed dose assessment tools, like in the recently released software CALDose_X. This study reports mainly on the first step of this project, namely the improvement of the existing adult phantoms MAX06 and FAX06 to become the starting points for the development of the new phantom series.