ISO 4037-1979/Add 2-1989 校准剂量计和剂量率计并确定其响应作为光子能量函数的X和γ参考辐射-附录2:能量在4 MeV和9 MeV之间的光子参考辐射
X and gamma reference radiations for calibrating dosemeters and dose ratemeters and for determining their response as a function of photon energy — Addendum 2: Photon reference radiations at energies