Assunto
rare earths
308
neutron activation analysis
77
Rare earths
64
Terras raras
51
brazil
36
trace amounts
34
sediments
27
separation processes
24
x-ray diffraction
24
oxidation
22
doped materials
21
spectroscopy
18
uranium
18
thorium
17
luminescence
16
multi-element analysis
16
oxides
16
ceramics
15
elements
15
metals
15
icp mass spectroscopy
14
rocks
14
solvent extraction
14
experimental data
13
microstructure
13
yttrium oxides
13
Artigo original
12
Luminescence
12
sintering
12
soils
12
aluminium oxides
11
concentration ratio
11
gamma spectroscopy
11
impurities
11
scanning electron microscopy
11
sol-gel process
11
Luminescência
10
calibration standards
10
cerium
10
chromium alloys
10
coatings
10
crystal growth
10
ion exchange chromatography
10
iron alloys
10
precipitation
10
gadolinium
9
ion exchange
9
lasers
9
nanostructures
9
plants
9
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