Table 5.
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 |
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.