[en] The most frequently encountered sources in Belgium are: disused radium therapy sources: tubes and seeds used in brachytherapy; teletherapy sources (Co-60 or Cs-137 gamma-ray sources); industrial and research high activity sources, including neutron sources (Ra/Be - Am/Be, Cf-252, ...); other small sources (fire detectors, lightning rods, calibration sources). All radioactive sources, once treated and conditioned in an acceptable waste form, shall be disposed of in a geologic repository site. The reference host material actually under investigation in the Belgian program is the Boom clay layer. An underground research facility, approx. 220 m under the site of the Belgian Nuclear Research Centre (SCK·CEN) is in operation in this host rock. No disposal in a surface repository is envisaged for radioactive sources since the reference intrusion scenarios as considered in the safety evaluations of a surface repository site do not include the presence of point singularities. Mainly two distinct scenarios are considered: Other than HA sources: Maximizing the volume reduction by disassembling the devices and managing only the radioactive parts of the device (Volume reduction factors >10000 are possible). HA sources: no disassembling because of safety reasons during disassembling and intermediate storage. In addition the activity shall not always have decreased sufficiently after institutional control of surface repository. The methodology for treatment of the different types of sources are described