[en] The report attempts to give a review of available information on the pulsed-neutron, capture-gamma tool. It starts with a discussion of the general principle of the physics of the tool. Next a review of available tool design data is given, including a special discussion of the source-detector distance. Operational data available on the tool is also considered. These reviews are followed by data on the SIGMAa2200 value of various materials relevant to petroleum technology. Finally the various approaches used to treat the measurements in order to obtain the absorption cross section of the medium are outlined. (author) 20 refs