[en] This presentation focuses on environmental radioactivity, sources and levels, in the Northwestern part of Russia, including the summary of the latest surveys and studies. The sources are divided into atmospheric, land-based, and marine sources of radioactivity

[en] Radon in indoor air is the main source of ionizing radiation in Norway. The booklet contains a presentation of radon sources, measurement methods, indoor radon concentrations, action levels, health risk and remedial measures

[en] The doses to the Norwegian population from naturally occuring radiation are extensively reviewed. The annual population weighted average dose equivalent to the Norwegian population from ²²²Rn and its daughters is estimated to be between 3.5 and 4.5 mSv. The average concentration of ²²⁰Rn daughters in Norwegian dwellings is most probably between 1.0 and 1.5 Bq m^-3. The corresponding effective dose equivalent for ²²⁰Rn and its daughters is estimated to be between 0.4 and 0.6 mSv. The total annual collective dose equivalent from naturally occuring radiation in Norway is found to be between 21000 and 27000 man Sv. The doses to the Norwegian population from the Chernobyl fallout are briefly discussed. Based on the results of a ''food basket'' project and supplementary data from about 30000 measurements on food samples the first year after the reactor accident, the total annual effective dose equivalent from foodstuffs to an average Norwegian consumer during this first year is estimated to be 0.15 +-0.002 m Sv at the 95% confidence level. The per caput effective dose equivalent from external fallout gamma radiation in the first year after the Chernobyl accident, is approximately 82 μSv in Norway

[en] Occupational doses from radon daughter exposure in different underground environments in Norway have been estimated. Monitoring programs have been undertaken in mines, hydroelectric power stations, defence installations and tunnels. Based on these measurements the average effective dose equivalent and the corresponding collective effective dose equivalent have been estimated. Hydroelectric power stations is the largest group. In 1984 and 1985 measurements were performed in about 130 of the appr. 150 facilities in Norway. The average radon concentration was about 270 Bq/m³, and the corresponding average annual effective dose equivalent between 2 and 2.5 mSv. In 1984 there were about 19 mines in operations in Norway. Based on the measurements, the average radon concentration in mines is 260 Bq/m³, and the corresponding average annual effective dose equivalent 3.4 mSv. However, at the time being there are only 10 mines in operation and the number of miners has been reduced from about 1400 in 1984 to about 900 in 1990. The measurements show that the average level of radon in defence installations and tunnels is less than in mines and hydroelectric power stations. The total collective effective dose equivalent for workers underground in Norway is estimated in this paper to be between 5 and 7 manSv. 9 refs., 3 tabs

[en] The report discusses neutron detection with respect to dosimetry and compares different thermoluminescent dosimetry materials for neutron dosimetry. Construction and calibration of a thermoluminescence albedo neutron dosemeter, developed by the authors, is described

[en] Radon in dwellings is the main source of human exposure to ionizing radiation. Recommended action levels are given for radon in indoor air, radon at underground work-places, radon in household water and radioactivity in building materials. 10 refs

[en] In this leaflet Norwegian recommendations for measurements of radon in dwellings and building sites are given. 3 refs., 2 figs

[en] In the booklet different methods for the measurement of indoor radon concentration is described, evaluated and classified. An evaluation of radon measuring methods used in building site investigations is also given. 1 ref., 2 figs., 5 tabs

[en] This booklet contains general information about naturally occurring radioactive materials, NORM, in production of oil and natural gas, occupational doses, radiation protection procedures and measures, and classification methods of contaminated equipment. 6 refs., 1 fig., 1 tab

[en] This booklet is a guide for Norwegian local authority in the establishment of municipal strategy of indoor radon surveys. It gives advise as to the preparation of local radon maps, the legal basis and information to inhabitants