To calculate MDDL, do we need to add response due to dark current fluctuation to non -zero dose-response of detector or Subtract it. as it is aborved at high temperatures , value of DC response increases due to thermonic emission of planchit
The detection limit must include all noise.
You can base a detection limit on signal, only. This detection limit includes noise.
A detection limit for dose must include the signal detection limit and conversion uncertainty.
If the difference in the indicated values between the detector-A [exposed to radiation] and the detector-B as reference [in the same environment (temperature, etc.) but not exposed to radiation] is surely positive, the given radiation dose is greater than the MDDL. Both values include dark currents. "Not detected" means the state where the signal is buried in noise level and cannot be distinguished. The measurement should be repeated several times for statistics.
In order to measure the MDDL, you have to measure background radiation several times (the more, the merrier) with TLs from the same batch. You'll get a mean measurement higher than zero, and a given standard deviation (dispersion). The comparison of the mean and the dispersion gives you the probability of distinguishing background from a "real" detection.
Perhaps you should check new advanced cumulative dose meters https://www.varadis.com/products/
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