Dose criteria for limitation of exposure incurred by persons helping the patients or living with patients discharged from hospitals following radionuclide therapy or brachytherapy with implanted sealed radionuclide sources have been proposed for national Russian regulation. By means of a conservative dosimetry model, the values of operational radiological criteria for patient discharge from hospital are substantiated, i.e. whole body activity for radionuclides ¹²⁵I,¹³¹I,¹⁵³Sm and ¹⁸⁸Re as well as dose rate near patient body. Observance of suggested criteria included in the new Russian Standards for Radiation Safety (RSS-99/2009) will ensure radiation safety of people in near environment (family, close friends et ah).

The article presents issues of average annual radon concentration estimation in the dwelling air after finishing construction works based on the results of short-term measurements. It is shown that, if certain requirements to the measuring conditions are met, results of measurements and estimation of their uncertainty are enough for these issues.

The article addresses results of measures of intensity reduction of radon intake to a dwelling from the bedrock and soil by the means of source isolation. It is noted that for mentioned type of radon mitigation a choice of membrane material and accuracy of isolation work are of the main importance. Authors demonstrate that it is practically impossible to get required attenuation factor of radon flow to the dwelling during implementation of radon mitigation in the limited part of building boundary. Two methods for evaluation of effectiveness of radon mitigation are described.

The present work is devoted to the analysis of 137Cs dynamics for the critical links of natural food chain during different periods after radioactive fallouts which is necessary for population internal exposure doses estimation as well as for doses reconstruction and prognosis.

The article summarizes and analyses the results of research work conducted by the authors collective on high radon concentration effects on mine workers from the tungsten ore mine and population of the Akchatau settlement located in the Dzhezkazgan region of Kazakstan around this mine. Heightened morbidity rate for lung cancer, respiratory tract diseases is being revealed. Clinical examination found out pathological changes among the population of settlement, which can be linked with the radiation exposure: cataracts, abnormal gestation courses. Immunological investigations revealed some causes of discovered pathological changes: tissue immunodepression ofrespiratory tract, autoimmune processes to the lung antigens at respiratory system pathology.

The article addresses results of measures of intensity reduction of radon intake to a dwelling from the bedrock and soil by the means of source isolation. It is noted that for mentioned type of radon mitigation a choice of membrane material and accuracy of isolation work are of the main importance. Authors demonstrate that it is practically impossible to get required attenuation factor of radon flow to the dwelling during implementation of radon mitigation in the limited part of building boundary. Two methods for evaluation of effectiveness of radon mitigation are described.

Briefly considered history of the  development and present status of the normative-methodical basis for the limitation of man-made and natural radon influence on personnel and population. It is analyzed the transfer factors from radon radiometric values to effective dose, corresponding to various versions of RSS and normative-methodical documents for limitation of the irradiation from natural sources. It is formulated proposals to the  new RSS editing in a part of the standardization of  radon.