M-radiation

[em-rey-dee-ey-shuh n] /ˈɛmˌreɪ diˌeɪ ʃən/

noun, Physics.
1.
See under .
[em-lahyn] /ˈɛmˌlaɪn/
noun, Physics.
1.
one of a series of lines (M-series) in the x-ray spectrum of an atom corresponding to radiation (M-radiation) caused by the transition of an electron to the M-shell.