TY - GEN AU - C O'Brien AU - L. Buermann C2 - Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD DA - 2009-12-31 LA - en M1 - 114 PB - Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD PY - 2009 TI - Comparison of the NIST and PTB Standards for Air Kerma and Low-Energy X-rays UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903376 ER -