The study of anneal of optical stimulated luminescence (OSL) in the nanoDot® OSLD exposed by light emitting diode (LED) and fluorescent lamp

Abstract

Background: The nanoDot^® OSLD can be used as a personal radiometer to measure the equivalent radiation dose of the lens of the eye, knuckle or wrist, and it can be reused by exposure from fluorescent lamp in order to anneal the nanoDot^® OSLD. The radiation dose after expose received should be less than 0.1 mSv. The laboratory that uses the fluorescent lamp had a problem of using several hours for the exposure. Therefore, the researcher has an idea to reduce exposure using LED instead of fluorescent lamp. Objective: This work aimed to anneal the optical stimulated luminescence (OSL) in the nanoDot^® OSLD by exposure from light emitting diode (LED) and fluorescent lamp. Methods: For LED, 90 nanoDot^®OSLDs were irradiated 5 mSv of x-rays, and then bathe in 3 sets of 5 of nanoDot^® OSLDs, starting from red to blue light, taking 5, 15 and 30 minutes to read and record the radiation dose. The percentage difference of the radiation dose was calculated, plot the graph was performed. For the blue fluorescent lamp, 50 nanoDot^® OSLDs were irradiated 7 mSv of x-rays, and took 10 sets of 5 of the nanoDot^® OSLDs, taking 5, 15, 30, 60 minutes and 1 day to read and record. Results: LED of all colors can anneal, and the radiation dose reading after exposure less than 0.1 mSv were red, green, white and yellow light, respectively, while fluorescent, it takes 1 day. Conclusions: The nanoDot^® OSLD can be annealed by both of LED and fluorescent lamp, and blue LED is suitable for anneal, and can be used LED instead fluorescent lamp.