Dosimetry

Why the Harshaw TLD Dose Algorithms use 8 days for Fade

Posted by Joe Rotunda on

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.

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How to Reduce Uncertainty in TLD Measurements

Posted by Joe Rotunda on

How to Reduce Uncertainty in TLD Measurements

  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...

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