TY  - RPRT
TI  - Mass energy-transfer and mass energy-absorption coefficients, including in-flight positron annihilation for photon energies 1 keV to 100 MeV 
AU  - Higgens, P D
AU  - Attix, F H
AU  - Hubbell, J H
AU  - Seltzer, S M
AU  - Berger, M J
AU  - Sibata, C H
PY  - 1992
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST IR 4812
DO  - 10.6028/NIST.IR.4812
ER  -