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. Author manuscript; available in PMC: 2017 Sep 29.
Published in final edited form as: Metrologia. 2012;49(Technical Suppl):06006. doi: 10.1088/0026-1394/49/1A/06006

Table 5.

Correction factors for the BIPM M-01 standard

Radiation quality 100 kV 135 kV 180 kV 250 kV uiA uiB
Air attenuation kaa 1.0099 1.0065 1.0055 1.0047 0.0002 0.0001
Photon scatter ksc 0.9952 0.9959 0.9964 0.9974 - 0.0003
Fluorescence kfl 0.9985 0.9992 0.9994 0.9999 - 0.0003
Electron loss ke 1.0000 1.0015 1.0047 1.0085 - 0.0005
Ion recombination ks 1.0010 1.0010 1.0010 1.0010 0.0002 0.0001
Polarity kpol 1.0002 1.0002 1.0002 1.0002 0.0001 -
Field distortion kd 1.0000 1.0000 1.0000 1.0000 - 0.0007
Diaphragm correction kdia 0.9995 0.9993 0.9991 0.9980 - 0.0003
Wall transmission kp 1.0000 1.0000 0.9999 0.9988 0.0001 -
Humidity kh 0.9980 0.9980 0.9980 0.9980 - 0.0003
Radiative loss 1 – gair 0.9999 0.9999 0.9998 0.9997 - 0.0001
a

Values for the BIPM reference conditions of 293.15 K and 101.325 kPa; each measurement is corrected using the air density measured at the time.