期刊
JOURNAL OF NUCLEAR MATERIALS
卷 504, 期 -, 页码 277-280出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2018.03.045
关键词
Positron annihilation; Spallation targets; Irradiation effects in solids; Helium bubbles; Gas-filled cavities
In the present work, the specific positron trapping rate of small helium bubbles was empirically derived from positron annihilation lifetime spectroscopy (PALS) and transmission electron microscopy (TEM) studies of Fe9Cr martensitic steels. Both techniques are well known to be sensitive to nanometer-sized helium-filled cavities induced during irradiation in a mixed proton-neutron spectrum of spallation target. Complementary TEM and PALS studies show that positrons are being trapped to these defects at a rate of 1.2 +/- 0.8 x 10(-14) m(3) s(-1). This suggests that helium bubbles in ferritic/martensitic steels are attractive traps for positrons comparable to mono-vacancies and quantitative analysis of the bubbles by PALS technique is plausible. (c) 2018 Elsevier B.V. All rights reserved.
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