4By L G H. SARSFIEIff), M. Sc. (Eng.), Member. Safe ty measures in X-ray work, including high-vohage flexible cahlcs[J. Electrical Engineers, 2010,19(3) : 253-270.
5Taylor, Lauriston S. The economic features of Xray protection[J. Journal of Applied Physics, 2009, 32 (1) :598-603.