About the Performance Verification (P.V.) Module
P.V. Module: A ‘Daily Check’ of reader performance
The purpose of the Performance Verification (P.V.) Module is to provide a short-term verification or ‘daily check’ of the reader’s absorbance measurement accuracy. The P.V. Module follows the guidance in ISO/ASTM 51275:2013(E) Standard Practice for Use of a Radiochromic Film Dosimetry System, section 7.3.2 Implementation of a daily check program intended to verify instrument performance before and after measurement sessions is also recommended.
The P.V. Module is intended to be used as an additional check of instrument perfomance, as part of the user’s complete performance verification protocols for the reader. It is not a replacement for a complete performance verification of the reader.
About P.V. Test Methods
A performance verification test method (P.V. Method) verifies the wavelength accuracy and the photometric accuracy of the attached, active reader.
Photometric Accuracy: The photometric accuracy test will use a certified photometric accuracy reference standard measured at 1 or 2 fixed wavelengths. You can use any reference standard that has a value certified in Absorbance units (A). The photometric accuracy test parameters are defined by the reference standard’s certifed value.
Test the photometric accuracy at 1 fixed wavelength
Test the photometric accuracy at 2 fixed wavelength, which allows you to bracket the wavelength of use (e.g. 552nm for B3 dosimeters).
Wavelength Accuracy: The wavelength accuracy test the closeness of the wavelength value reported by the reader to the actual value. The software locates the peak near 541.9nm of the internal xenon lamp, and repeats the test three (3) times. The wavelength accuracy test parameters are defined by the published Thermo Evolution spectrophotometer specification for wavelength accuracy.
How does the P.V. Module work?
The P.V. Module is designed to use the Thermo Spectronic reference standards (GEX product P4220) and the Evo Cuvette and Hinged Dosimeter Holder (GEX product P4334). 👉 See P.V. Module Requirements.
The user will follow the on-screen instructions to perform a P.V. test. The P.V. test takes about 2-3 minutes to complete. 👉 See P.V. Module Workflow.
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▶️ See a demonstration of the P.V. Module
https://youtu.be/5R95JAQ0Nqg?si=31zJoCUFomWYXrmV