364 



Soil No. 3 (northern side 

 of the crater, background 

 175-220 jir/hr) 



Soil No. 4 (southeastern 

 side of the crater, 

 background 130-lSO 

 l»r/hr) 



Drinking water (Markha 

 River, samples 1-12 from 

 the mouth of the 'dry* 

 brook at 300 m intervals 

 for 3 J km downstream, 

 background 8-13 tir/hr) 



Reindeer moss (site of 

 contaminatioiu profile 6, 

 background 60 iir/hr) 



Reindeer moss (site of 

 base 1 of the expedition 

 camp, 1 km upstream, 

 background 10 (ir/hr) 



12 



II 



SO times higher than 

 background 



40 times higher than 

 background 



same 



same 



Below sensitivity of 

 instrument 



20 times higher than 

 background 



Below sensitivity 



Sampling date 

 07/01/90 



same 



same 



CONCLUSION 



1. At the sites of nuclear explosions in the Mirny district (town of Taas-Yuryakh. dty of Udachny, area of 

 the Markha River) radioactive contamination of the soil and vegetation was found (2-SO times higher than 

 the radiation bacl^round). 



2. The gamma background exceeds the natural values by 25 times and more. 



3. The total beta activity of drinking water sources (Botuobuy River, Taas- Yuiyakh River, Sytykan water 

 reservoir, and Markha River) is lower than VDU-88 (SXia" Ci/I). 



RECOMENDATIONS 



To improve the performance of specialists who go to areas with an unfavorable radiation situation 

 the following is necessary: 



1. Available equipment: 



- surveying radiometer SRP-6ft4)l 



- RSP-lOlMunit 



- DRG-OIT dosimeter 



- DKS-04 dosimeter (each specialist should have one) 



-14- 



