environmental radioactivity monitoring near …...areas in romania national environmental protection...
TRANSCRIPT
Elena Simion
ENVIRONMENTAL RADIOACTIVITY
MONITORING NEAR URANIUM MINING
AREAS IN ROMANIA
National Environmental Protection Agency
Mountain
2Hill
Environmental Radioactivity Monitoring
Plain
4Maritime
From National Uranium Company S.A.
Uranium mining in Romania
-3 uranium mining branches :• Banat area - closed out; • Bihor area - closed out;• Suceava area -
underground mine, operational; it is the main raw uranium ore producer;
Monitoring and Sampling strategy
• 3 environmental matrices:water – surface and underground water (wells) soil - uncultivated soil vegetation - spontaneus vegetation (grass)
• sampling frequence: from 1/year to montly
Measuring methods
• low background total beta counter• counter background was between 2.5 and 6 counts per minute• 90(Sr/Y) reference standard for determination of equipment detectionefficiency.• measuring time: after 5 days from sampling, for 3000 sec.
• gamma spectrometry• high purity and resolution Canberra HPGe detector, model BE 3820, tipn, planar (from 3 keV to 3MeV) and niminal efficiency of 35%• Energetic resolution: 5.9 KeV → 450 eV; 122 Kev → 750 eV; 1332.5 KeV→ 2100 eV.• Data analyse– Genie 2000 software• Energy calibration – reference source and spectrum peaks• Efficiency calibration – ISOCS softeare and certified reference materialsfrom IAEA in diferent matrix.•measuring time: 64800 sec.
• 2 operational undergroundmines – Crucea and Botusana
Monitoring of Suceava uranium minig area
From National Uranium Company S.A.
Water monitoring
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R. S
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ava
R. S
iret
Pr.
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Pr.
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Pr.
Tro
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Pr.
Tro
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lui -
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Pr.
Cru
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Pr.
Tro
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lui
Pr.
Cru
cea
-av
. St.
Ep
ura
re
R. B
istr
ita
Botusana Crucea
Bq
/m3
Concentration of U-235 in surface water
2008
2009
2010
2011
2012
2013
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160R
. Su
ceav
a
R. S
iret
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am c
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na
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Pr.
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on
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san
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Pr.
Sto
luri
-av
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tusa
na
R. M
old
ova
Pr.
Cru
cea
-am
. co
nfl
Pr.
Tro
aca
gava
nu
lui
Pr.
Tro
aca
Gav
anu
lui -
am G
al 8
Pr.
Tro
aca
Gav
anu
lui -
av G
al 8
Pr.
Cru
cea
-av
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Pr.
Tro
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gava
nu
lui
Pr.
Cru
cea
-av
. St.
Ep
ura
re
R. B
istr
ita
Botusana Crucea
Bq
/m3
Concentration of Ra-226 in surface water
2008
2009
2010
2011
2012
2013
Water monitoring
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3000
R. S
uce
ava
R. S
iret
Pr.
Su
ha
am c
on
fl. P
r.B
otu
san
a
Pr.
Bo
tusa
na
-av
Pr.
Su
ha
av c
on
fl. P
r.B
otu
san
a
Pr.
Sto
luri
-av
. Bo
tusa
na
R. M
old
ova
Pr.
Cru
cea
-am
. co
nfl
Pr.
Tro
aca
gava
nu
lui
Pr.
Tro
aca
Gav
anu
lui -
am G
al 8
Pr.
Tro
aca
Gav
anu
lui -
av G
al 8
Pr.
Cru
cea
-av
. co
nfl
Pr.
Tro
aca
gava
nu
lui
Pr.
Cru
cea
-av
. St.
Ep
ura
re
R. B
istr
ita
Botusana Crucea
Bq
/m3
Concentration of Th-234 in surface water
2008
2009
2010
2011
2012
2013
Water monitoring
Soil monitoring
Soil monitoring
Soil monitoring
•closed out
Monitoring of Bihor uranium minig area
Băiţa Plai – Bihor uranium minig area – dec. 2012mobile gamma dose rate monitoring
Băiţa Plai – Bihor uranium minig area – sept 2015mobile gamma dose rate monitoring
Băiţa Plai – Bihor uranium minig area
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Th-234 Ra-226 U-235
Soil radioactivity near CNU site, Bq/kg
2010 2012 2013
Băiţa Plai – Bihor uranium minig area
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Th-234 Ra-226 U-235
Water radioactivity near CNU site, Bq/mc
2010 2012 2013
Poiana– Bihor uranium minig area
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1000
2000
3000
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6000
Th-234 Ra-226 U-235
Soil radioactivity near Poiana site, Bq/kg
2010 2012 2013
Poiana– Bihor uranium minig area
0
10
20
30
40
50
60
Th-234 Ra-226 U-235
Water radioactivity Poiana site, Bq/mc
2010 2012 2013
•closed out
Monitoring of Brazava dump, Arad county
Monitoring of Brazava dump, Arad county
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1000
2000
3000
4000
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6000
Th-234 Ra-226 U-235
Soil radioactivity Barzava dump site, Bq/kg
2009 2010 2012 2013
Monitoring of Brazava dump, Arad county
• Environment monitoring is a mandatory task for all mining
and milling activities in order to determine the impact on the
environment;
• Based on the environment radioactivity monitoring
perfomed by the Local Environmental Protection Agency and
the operator, monitoring locations and maximum allowed
limits for radioactive pollutants, like uranium and radium are
permanently improved;
• Devices, reagents, personnel, procedures are all ensured
in order to undertake proper laboratory works.
Conclusions
Questions?Thank you for your attention!