TY  - RPRT
TI  - Central-axis ⁶⁰CO ionization measurements in graphite as a function of phantom diameter, depth, and field size 
AU  - Domen, Steve R
PY  - 1978
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 77-1203
DO  - 10.6028/NBS.IR.77-1203
ER  -