Analysis on components of characteristic X-ray yield of pure thick targets by positron impact near threshold energyZ. X. Ke, Y. Wu, M. Pan, S. Liang, M. X. Xu, Z. Zhao, B. Y. Wang and P. ZhangEPL, 133 4 (2021) 43001DOI: https://doi.org/10.1209/0295-5075/133/43001