Color Centers Annealing and Thermoluminescence in Sodium Silicate Glass

The yields of radiation-induced electrons and holes trapped in the glass matrix are easily determined by introducing metal ions, such as Sb, Mo, and U ions, into water-soluble NaPO3 polymer glass. Doping 1 mol % of these ions of a lower oxidation state wholly prevents the trapping of holes and results in oxidation to their higher oxidation states. A reaction in the reverse direction also occurs for the same ions of a higher oxidation state, which are converted into a lower one by reduction. This radiation-induced redox reaction has a minimum yield at a dopant composition corresponding to Sb2O4 for Sb(III)–Sb(V), Mo6O17 for Mo(V)–Mo(VI), and U3O8 for U(IV)–U(VI) redox couples. The largest effective volume among these ions for capturing the holes is for Sb(III). In a high-dose region (1020 to 1021 eV/g), the yields of the redox products of these ions increase logarithmically with the γ-dose absorbed. This makes it difficult to determine the G-value of the redox products precisely. The approximate values are in an order of magnitude of 0.1 atom per 100 eV absorbed.

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Chemical Effects of 31P(n,γ)32P Reaction in Phosphate Glass—A Radiation Chemical Approach to Hot Atom Chemistry

Lin¹,

Matsuura²

1975

Bulletin of the Chemical Society of Japan

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Sodium metaphosphate glass, with a polymerization degree of 50–100, was used as target material for the study of the chemical effects of (n, γ) reaction. Mean oxidation number of 32P was introduced as a new parameter to elucidate the oxidation reaction brought on the recoil product. The mean oxidation number of 32P from (n, γ) recoil in such glassy polyphosphate was about +4. More than 90% of the 32P set free was reattached as an end group in the newly formed radioactive polyphosphate. The recoiled monoatomic 32P species (less than 10% of the total 32P) defficient in oxygen kept a low mean oxidation number ca. +3. Ionizing radiation produced color center (with λmax at 510 nm) which seemed partially to oxidize the 32P product. The effect was very weak, and could be suppressed by the hold scavengers. Thermal annealing showed that the mean oxidation number of 32P rapidly attained +5 (the valence of target) by 300 °C; however, it seems very difficult to raise the mean oxidation number of 32P to +5 by γ-ray annealing. The oxidation of 32P through thermal annealing is considered to be a diffusion process, with an activation energy of ca. 7×103 cal/mol. Possible reaction between the hot-zone and the radiation spurs is discussed.

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Color Centers Annealing and Thermoluminescence in Sodium Silicate Glass

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Magnetic resonance studies on radiation-induced point defects in mixed oxide glasses. II. Spin centers in alkali silicate glasses

Magnetic resonance studies on radiation-induced point defects in mixed oxide glasses. II. Spin centers in alkali silicate glasses

Chemical Approach to the Radiolysis of Polyphosphate Glass. I. Effects of Sb(III, V), Mo(V, VI) and U(IV, VI) Ions

Chemical Effects of 31P(n,γ)32P Reaction in Phosphate Glass—A Radiation Chemical Approach to Hot Atom Chemistry

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