It is proposed a simultaneous method for treatment and control of potentially dangerous objects like viruses or explosives, immersed in a post-office deliverables. Those methods are based on the irradiation and post-irradiation IR-control. To resolve the problem of mail items safety the methods of indirect temperaturecontrasting imagining [1,2] can be successfully used. For preventive bactericidal treatment of mail items it is proposed to use the method of radiative sterilization, which is widely spread all over the world for processing of medical materials. The value of the absorbed dose 15-25 kGr can kill the vital pathogenic microorganisms. Estimated cost of such treatment can be received proceeding from the calculation that for processing of 15 kg of envelopes it is necessary to apply electric power equal to 1 KWatthour. Besides the preventive treatment there is also a problem of revealing of envelopes with suspicious immersions. It is known, that at radiation passing through the substance, the part of the absorbed energy is spent for increasing temperature of irradiated object. Thus the object absorbtion ability depends on its density and geometrical sizes, in particular on thickness of an immersing layer. If in a post envelope there is an unauthorized immersion (for example the plastic explosives), the radiation field will be immersed more intensively and the temperature on an irradiation zone output will differ from a background temperature. One more indication of the unauthorized immersion presence can be the change of a radiation field after passing through the irradiated object. For control of the radiation field it is offered to use the screen made from a thin metallic foil. The change of a radiation flow also will cause a change of the screen surface temperature.The measurement of a screen temperature and irradiated objects is offered to be made with an Far-Infrared radiometer [3] (with the sensitivity being in the range of the waves from 15 micrometers to 1 mm, corresponding to a range of about 20 THz to 300 GHz).