TY  - RPRT
TI  - Use of ionization chambers in obtaining data on radiation at points within the head during dental x-ray exposure : progress report
AU  - Hudson, Donald C
AU  - Kumpula, John W
PY  - 1954
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS report ; 3956
DO  - 10.6028/NBS.RPT.3956
ER  -