Bethesda, MD, United States
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Benevides L.,Us Naval Dosimetry Center | Romanyukha A.,Us Naval Dosimetry Center | Hull F.,Us Naval Dosimetry Center | Duffy M.,Us Naval Dosimetry Center | And 2 more authors.
Radiation Measurements | Year: 2010

We are reporting the results of an investigation designed to determine the magnitude of the light induced fading associated with the OSL response of Al2O3:C. Unlike previous studies where bare, radiation sensitive OSL elements were exposed directly to light, most of the experiments described here were conducted using sealed commercially available OSL dosimeters. During light exposure the OSL sensitive elements were kept inside a standard commercially available plastic badge. A commercial OSL system was used for these experiments in an attempt to simulate typical field use conditions. Both light induced signal and light induced fading were considered, however no measurable light induced signal could be identified. Light induced fading effects, however, were significant, up to 55% loss of OSL signal following daylight exposure of 45 days. The possibility that dose information may be easily erased, intentionally or accidentally, could impose significant restrictions on the ability of the US Navy to defend, if needed, the reported personnel dose levels. © 2009 Elsevier Ltd. All rights reserved.


Benevides L.,Us Naval Dosimetry Center | Romanyukha A.,Us Naval Dosimetry Center | Hull F.,Us Naval Dosimetry Center | Duffy M.,Us Naval Dosimetry Center | And 3 more authors.
Radiation Measurements | Year: 2011

In this study, we are reporting the investigation of the light-induced fading study associated with exposure to incandescent and fluorescent lighting conditions. All experiments described in this study were conducted using a sealed commercially available OSL dosimeter. Our experiments showed that the element holder showed significant light leaks that result in light-induced fading. While an opaque dosimeter holder may reduce the effect, a reengineered element holder is needed. The trend in lighting fading was also clearly demonstrated using fluorescent and incandescent lighting conditions. A repeated reading of a dosimeter causes a predictable loss in signal that must be taken into account for each subsequent reading. Our study concludes that the likelihood that dose data may be loss as a result of light induced fading is a real possibility with the advent of the identified light leaks. © 2011 Elsevier Ltd. All rights reserved.

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