@misc{805641, author = {P Higgins and C Sibata and F Attix and J Hubbell and Stephen Seltzer and Martin Berger}, title = {Mass Energy Transfer and Absorption Coefficients, Including In-Flight Positron Annihilation}, year = {1992}, month = {1992-01-01 00:01:00}, publisher = {NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD}, language = {en}, }