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18 MV X-rays
Physical quantity of procedure
Relative standard uncertainty (%)
TLD
Ans Swinen
PhD thesis
2005
TLD calibration with IC
1.7%
TLD reading of “unknown detector”
1.0%
Non-lineality
0.5%
Fading
<0.5%
Combined standard uncertainty of step 1
2.1%
Step 2: Correction factors
Field correction factor
1.5%
SSD correction factor
1.5%
Combined standard uncertainty of step 2
2.1%
Step 3: measure on the patient
Reading of the in vivo detector
1
1.2%
Combined standard uncertainty of step 3
1.2%
Combined standard uncertainty of steps 1+2+3
3.2%
1
reproducibility on positioning on patients was not tested.
Uncertainty in entrance dose measurements