样品

C (at%)

N (at%)

O (at%)

Na (at%)

C/N (mol ratio)

U₅₀₀

39.29

58.46

2.25

0

0.67

UNa2

38.27

51.70

5.96

4.07

0.74

UNa2-Etching

38.21

57.33

4.30

0

0.67