TY - GEN AU - Hudson, Donald C AU - Kumpula, John W C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1954-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.RPT.3956 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1954 TI - Use of ionization chambers in obtaining data on radiation at points within the head during dental x-ray exposure ::progress report ER -