TY - RPRT TI - Correction Factors for the NIST Free-Air Ionization Chambers Used to Realize Air Kerma fromW-Anode X-Ray Beams AU - Seltzer, Stephen M. PY - 2012 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 7887 DO - 10.6028/NIST.IR.7887 ER -