What question did this study set out to answer?

Determine and compare negative dilatation and compaction mechanisms in vitreous silica exposed to various radiation types as a function of dose and temperature.

November 1, 1968Journal of Applied Physics

The Radiation Compaction of Vitreous Silica

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Authors

WPWilliam PrimakAdventist Hinsdale Hospital RKR. T. KampwirthArgonne National Laboratory

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Implication

Experimental study demonstrates dose-dependent compaction mechanisms in vitreous silica under diverse radiation types, indicating structural rearrangement into free volume.

Key Points

Determine and compare negative dilatation and compaction mechanisms in vitreous silica exposed to various radiation types as a function of dose and temperature.
Irradiated vitreous silica samples using neutrons, 40–600 keV electrons, 140 keV ions (H+, D+, He+), and gamma rays across varying dose ranges.
Measured negative dilatation across an ambient temperature range of 0°C to 100°C to evaluate thermal activation dependencies.
Presaturation negative dilatation exhibited a linear dose dependence for neutrons, He+, and D+, while scaling to the 0.5–0.7 power of dose for H+, electrons, and gamma rays due to structural hardening.
Dilatations showed no temperature dependence from 0°C to 100°C, confirming that compaction is not thermally activated but driven by transient ionization relaxing Si–O bonds or atomic collision cascades.
Compaction from 140 keV He+ ions resulted from approximately equal contributions of ionization-induced relaxation and energy transfer to atomic vibrations.

Cite This Study

Primak et al. (1968) studied this question.

synapsesocial.com/papers/69d9fc722a25b240b7a3e096 https://doi.org/10.1063/1.1656029

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Implication

Experimental study demonstrates dose-dependent compaction mechanisms in vitreous silica under diverse radiation types, indicating structural rearrangement into free volume.

The Radiation Compaction of Vitreous Silica

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Implication

Key Points

Cite This Study

The Radiation Compaction of Vitreous Silica

Discussion

Member takes

Implication

Key Points

Cite This Study

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