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Distribution of radionuclides in soils in surroundings of Bratislava, capital of the Slovak Republic

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II. Man-made radionuclides. M tel L., Rosskopfov O., Rajec P., Galanda D., vec, V. ... distribution of the concentrations man-made radionuclides in soil from the ... – PowerPoint PPT presentation

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Title: Distribution of radionuclides in soils in surroundings of Bratislava, capital of the Slovak Republic


1
Distribution of radionuclides in soils in
surroundings of Bratislava, capital of the Slovak
Republic. II. Man-made radionuclides
  • Mátel L., Rosskopfová O., Rajec P.,
  • Galanda D.,vec, V.,
  •  
  • Department of Nuclear chemistry, Faculty of
    Science, Comenius University,
  • Mlynská dol. CH-1, 842 15 Bratislava, Slovakia
  •  

2
The actual distribution of the concentrations
man-made radionuclides in soil from the area of
Podunajske Biskupice is presented. The monitoring
was located 12 km south east from Bratislava
centre. Documentation is based on the collection
of soil and analysed for 137Cs, 90Sr, 239,240Pu,
and 241Am
3
The soils were analysed using gamma spectrometry
- ( HPGe detector with relative efficiencies 28
, Ortec ) - 137Cs. Analytical procedures involve
total dissolution of the samples, followed by
radiochemical separation and purification using
solvent extraction ( Aliquat-336 - 239,240Pu
TBP - 90Sr ), calcium oxalate precipitation and
extraction chromatography an Eichrom TRU Resin
- 241Am
4
Separation scheme for the simultaneous
determination of Pu, Sr ( A ) Pu, Am ( B ) -
soil, sediment   ashing   add tracers 236Pu
(242Pu ), 243Am and carriers ( Ba, Pb, Sr, Y
)   acid leaching with 8 M HNO3 - H2O2 (
autoclave, 180 0C , 3 times )   plutonium
oxidation state adjustment ( NaNO2
)   extraction with equal volume 30 Aliquat 336
in toluene ( in nitrate form )
 





5
A aqueous Am, Cm ,Y
organic Th, Pu, U  
evaporate washing
with 8 M HNO3 ( U ) dissolution in HNO3
10 M HCl (Th )

organic Pu
aqueous extraction with
TBP (Y )
( discard )


stripping Pu
with H2C2O4 - HClorganic Y aqueous
(discard )   stripping with H2O
micro precipitation with NdF3

precipitation of oxalates
( pH 2-3 )
Alpha spectrometry of Pu
Beta counting of Y-90 (
Sr-90 )
6
B aqueous Am, Cm
organic Th, Pu, U evaporate
washing
with 8 M HNO3 ( U )
10 M HCl ( Th )dissolution in 12 M
HCl

organic Pu aqueousevaporate


(discard )
dissolution in 1M HCl
stripping Pu with H2C2O4 -
HCl ( NH2OH.HCl, Ca2) calcium oxalate
precipitation destroy oxalate
dissolved in 2 M HNO3/0,5M Al(NO3)3

extraction
chromatography ( TRU.Spec Resin )
convert to Cl- form
with 9 M HCl 4 M HCl - Am
Micro
precipitation of Pu, Am with NdF3


Alpha spectrometry of Pu , Am

7
 
8
The interval of specific activity (Bq.kg-1) are
137Cs 14,1 - 83,8 90Sr 3,8 - 29,2 239,240Pu
0,130 - 2,904 241Am 0,704 -
0,580
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