255 



tl>ipium-232 has been observed. 



The magnitude of the dosage from the soil averages 20-50 

 uR/h, however, in some cases maximal dosages are possible (in the 

 sanatory-restricted zone of a tailings reservoir at PO 

 Khimkontsentrat in Novasibirsk values up to 275 uR/h occur, due 

 to the commercial activity of this business) . 



The available official data on the contamination of air, 

 water and soil of the Novasibirsk region do not provide a 

 complete picture of the condition of the environment in this 

 r«gion (and its various t«rritori««) ; n«v«rth«l«88, they fully 

 indicate zones of possible anthropo-technical stress resulting in 

 possible health problems in the population. 



In the Tomsk area substantial increases in the radiation 

 background i;aJ noted in the mouth of the Chernil ' shchikov 

 tributary where it flows into the Ob and entering from Tomsk area 

 7: water 100 m from the bank had 30 uR/h, general background was 

 30-35 uR/h. One must take into account that at the point of 

 measurement the water from the Chernil ' shchikov was already 

 considerably diluted with Ob water. Considering the fact, that 

 water from the Ob and its tributaries is considerably lower (1+4 

 uR/h) , one can attribute the above values to combination of the 

 industrial production in Tomsk-7 and the background levels in the 

 atmosphere and rivers of the surround region. 



In the Krasnoyarsk region in 1989-1991 research was done by 

 the Krasnoyarsk Scientific Center, SO RAN, to assess the radio- 

 ecological conditions in the Enisiy River. Aero-gamma-surveys 

 and complex investigations were done 1000 km below the sewage 

 outflow of the Gornokhimicheskiy plant using a specially equipped 

 vessel. Over a distance of 1000 km more than 600 water samples, 

 bottom grabs, soil, fish and plant samples were collected. The 

 investigations revealed all radioactive pollution components, 

 including plutomium, tritium and also cesium-137 and phsophorus- 

 32 (the major dosage-forming radionuclides). ../'.j 



It was noted that in the snow where sewage water from the 

 plant mixes, maximum concentrations are attained by Sodium-24, 

 magnanese-56, 2.6x10-7 Ki/1 and 2.3x10-7 ki/1 respectively, which 

 exceeds the maximum allowable concentration (MAC) according to 

 NRB-76/82 by 10 and 2 times respectively. In Atamanovo Village, 

 the first inhabited region below the sewage fallout, due to decay 

 and dilution, the concentration of the individual nuclides was 

 below the MAC, however, the total radioactivity was close to the 

 allowable norm. 



The concentration of the long-lived radianuclides (cobalt- 

 60, cesium-137 , europium-152 , 154) in a day of flow at the 

 Balchugovskiy channel for an average water height was about 1 Ki. 

 The total amount of radionuclides of technical origin below 

 islands where studies were done is about 17 Ki. The distribution 

 of radionuclides in profiles of bottom sediments is vary uneven 

 at various points in the river. 



Much attention was devoted to studies of the radioactive 

 contamination of fish. More than 40 samples were analyzed from 

 various species of endemic and anadromous fishes. The main 

 nuclides accumulating in the tissues of fish were phosphorous-32, 

 zinc-65, cesium-137 and closest to the outflow sodium-24, and it 



