Dosimetry

Have you ever wondered why the Harshaw TLD dose algorithms based on LiF:Mg,Ti have 8 days pre and post irradiation built into their calculations?

During the process of calibrating the dose algorithm you need to prepare dosimeters for the “Cs¹³⁷ Relative Response” factors and possibly beta and neutron calibration factors if you also need them calibrated. This is the time where the 8 days of pre- and post-irradiation come into consideration.

  Do you consider fade when you are calibrating your TLD system and performing readings for dose?  If you are using TLD-100, 600 or 700 (LiF:Mg,Ti), you need to ensure this is part of your readout protocol. For dosimetry systems using TLD-100H, 600H or 700H (LiF:Mg,Cu,P) this is not a concern when using the factory recommended time temperature profile (TTP). There are several ways that fade in LiF:Mg,Ti may be addressed.   Reducing Short-Term Uncertainty First, let’s look at calibrations for the reader calibration factor (RCF) or the TLD card element correction coefficient (ECC). The Harshaw TLD recommendation is to...