Muonic X-ray intensities in low-Z elements and their hydrides

K-series muonic X-ray intensity ratios have been measured in Li. LiH, Be, BeH2, B, B10H14, and LiBH4. The relative intensities of the transitions np → 1s, for n > 2, are enhanced for the higher-Z components in the hydrides compared to the elemental targets. Possible explanations for the observed intensity ratios are discussed.