[en] The first article of this issue of the SSDL Newsletter is a report of the 15th SSDL Scientific Committee (SSC) Meeting held at the IAEA Headquarters in March 2012. An overview of the new IAEA publication on ''Quality Assurance Programme for Computed Tomography: Diagnostic and Therapy Applications'' is presented in the second article. The third article is a report of a consultants' meeting on the Development of an International Database for Dosimetry Audit Networks for Radiotherapy. The results of an IAEA Survey of Dosimetry Audit Networks for Radiotherapy are presented in the fourth article. The last article is a short summary from a consultants' meeting on the revision of the SSDL Network Charter. The revision of the SSDL Network Charter has been recommended by the SSC in order to reflect the recent trends and developments in the metrology of ionizing radiation applicable at the level of the SSDL network members