Investigation On Bleaching Of Infrared Radiofluoroscence Signal With Optimized Power Of LEDS To Match The Standard Solar Spectrum
Volume 3 - Issue 6, June 2019 Edition
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Author(s)
I. A. El Mesady
Keywords
Infrared-Radiofluoroscence, Over-bleached, Solar simulator.
Abstract
In any luminescence measurement and to regenerate the luminescence signal, resetting of the signal is needed. This can be achieved by either natural or laboratory bleaching. In this paper the resetting behavior of the Infrared-Radiofluoroscence (IR-RF) signal has been investigated using six wavelengths LED-based solar simulator. For the IR-RF signal to complete reset in nature and not to be “over-bleached†in the laboratory, the intensities of the available LEDs on Lexsyg reader were adjusted to deliver low power signal to simulate the natural sunlight. It was found that signal could be reset using low power at least 6 h of bleaching, which was necessary to confirm the resetting of signal under power equivalent of almost 57 mW/cm2. In addition, bleaching time was reduced in order to get the highest attainable power of about 246 mW/cm2, which was capable of bleaching signal in 1 h. This finding is of great importance to apply IR-RF technique in sediments dating. It confirms that bleaching by low power is possible and machine time can be reduced by increasing power but still matching with natural sun.
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