title: Three-dimensional optical random access memory materials for use as radiation dosimeters.
abstract: This article describes the development of the first three-dimensional optical random access memory (3D-ORAM) material and readout system for monitoring energetic neutrons. Two different photochromic dyes, 5'-chloro-6-nitro-1',3',3'-trimethylspiro-[2H-1-benzopyran-2,2'-in doline] (spirobenzopyran) and anthracene, have been investigated for use in these 3-D ORAM dosimeter materials. These dyes were immobilized in a poly(methyl methacrylate) support, and the resulting dosimeter materials were irradiated with neutrons from a Cf-252 source. Fluorescence measurements from the dosimeter show a dramatic decrease in the overall fluorescence intensity of the 3D-ORAM dosimeter exposed to the Cf-252, relative to a nonirradiated dosimeter. In addition, a two-photon excitation readout system has been developed for determining characteristics of the radiation that are necessary for estimating dose.
authors: Oak Ridge National Laboratory, Tennessee 37831-6101, USA.
authors: B M
authors: BM
authors: Cullum
authors: J
authors: J
authors: Mobley
authors: J S
authors: JS
authors: Bogard
authors: M
authors: M
authors: Moscovitch
authors: G W
authors: GW
authors: Phillips
authors: T
authors: T
authors: Vo-Dinh