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A

:

5% O

2

B

:

2% O

2

C

:

0.4% O

2

D

:

0.1% O

2

E

:

0.01% O

2

Dependence of X-ray cell killing

on oxygen concentration

0

60

20

40

Dose (Gy)

0.1

100

0.01

10

1

0.001

A B C

D E

Surviving Fraction (%)

CHO Cells

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