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    STUDIA AMBIENTUM - Issue no. 1-2 / 2008  
         
  Article:   THE FIRST RADIO-METRICAL ESTIMATES OF THE RED LAKE’S SEDIMENTATION RATE.

Authors:  ROBERT BEGY, CONSTANTIN COSMA, ZOLTAN HORVATH. 		 
       
         
  Abstract:  This work presents the first estimates of the Red lake’s sedimentation rate. The determination of the sediment accumulation rate was estimated by using two well-known methods of recent sediment dating the Pb-210 and the Cs-137 method. Both methods are based on using gamma emission radio nuclides. The Pb-210 and Cs-137 concentration in the sediment were measured by using a gamma spectrometer with a Hp-Ge detector, GMX type. Then has been found activities between 40 – 110 Bq/kg for Pb-210 and 8-697 Bq/kg for Cs-137. Using the CRS methods for the calculation of sedimentation rate, we obtained a 0.5 cm /year value.

Keywords: Pb-210, Cs-137, radioisotopes, dating methods, sedimentation rate 		 
         
     
         
         
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