[en] A comparative examination of the most important techniques for the separation of mercury from irradiated biological material was made. Procedures for routine analysis and results for standard materials are given. Activation was performed at a thermal neutron flux of approximately 5x10¹²nxcm^-2xs^-1 during (<=)24 hours. Samples and standards have to be packed in closed quartz vials and should approximately have the same volume and mercury concentration. Purified active carbon loaded with a known amount of Hg(NO₃)₂ offers a convenient solution to this problem. The variation of the neutron flux with the irradiation position can be measured by the application of thin iron rings as flux monitors. Losses of mercury due to uptake in the wall of the irradiation containers are negligible. The most powerful destruction technique for large samples is that based on a stainless-steel bomb. (T. I.)