Homogeneous reaction rate model for hydrogen production from ion-irradiated polymers

Lewis, Morgan; Lee, E.H.; Mansur, L.K.; Coghlan, W.A.

doi:10.1016/0022-3115(94)90198-8

Cited by 9 publications

(12 citation statements)

References 15 publications

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“…33 The present results with protons and helium ions using pellets are significantly higher than found in most previous reports as shown in Figure 4. [16][17][18] In these studies polyethylene samples were irradiated in high vacuum by low-energy (0.1-1.5 MeV) particles. Lee and co-workers used thick polyethylene samples, and their results may be low because of the same reasons observed here with thick samples.…”

Section: Resultsmentioning

confidence: 99%

“…Lee and co-workers used thick polyethylene samples, and their results may be low because of the same reasons observed here with thick samples. 17,18 Foti and co-workers employed thin samples where relatively little energy is loss by the incident ion. It is not clear why their results are lower than in the present case.…”

Section: Resultsmentioning

confidence: 99%

“…Experiments and calculations show rapid degradation of the sample with reduced hydrogen yields at doses above about 10 14 particles/cm 2 . 18 Absolute determination of the response of the detection system to hydrogen is directly performed in the present technique, whereas a more indirect method must be used in high vacuum radiolysis. The use of a high vacuum technique for radiolysis apparently requires considerably more dose than in the present technique.…”

Section: Resultsmentioning

confidence: 99%

“…A few experiments have been performed with heavy charged particles. [16][17][18] However, particle energies were only a few MeV at the most and no systematic dependence on particle type or energy can be inferred from these studies because of the scarcity of data. Basic information on the radiation chemistry occurring in particle tracks can be obtained by carefully controlled experiments using various particles over a range of energies.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Hydrogen Production in the Radiolysis of High-Density Polyethylene

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LaVerne

1999

J. Phys. Chem. B

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The production of molecular hydrogen in the radiolysis of high-density polyethylene by γ rays and heavy ion beams has been investigated. Only the slightest increase in the radiation chemical yield of 3.1 molecules/100 eV was found from γ rays to protons of 5-15 MeV. A gradual increase in yield was observed on further increasing the linear energy transfer of the incident particles. This increase amounted to almost a doubling in the hydrogen yield from 10 eV/nm protons to about 800 eV/nm carbon ions. The exact reason for the increase in molecular hydrogen yield is uncertain, but it may involve reactions of excited states or enhanced combination reactions of carbon-centered radicals, thereby allowing more hydrogen to escape the particle tracks. Diffusion from the bulk material was found to have a dominant role on the observed dynamic profiles of hydrogen gas. A simple one-dimensional diffusion model was used to estimate the diffusion constant of hydrogen in polyethylene to be 2.2 × 10 -6 cm 2 /s.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molecular Hydrogen Production in the Radiolysis of High-Density Polyethylene

and

LaVerne

1999

J. Phys. Chem. B

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“…Hydrogen is the main gaseous product formed and there have been some previous studies using gamma rays (1) and low energy (<= 1 MeV) H, He, B, and Ar ions (2). The yield of hydrogen was found to decrease from 0.67 molecules/100 eV energy absorbed with 5 MeV protons to 0.11 with protons of 15 MeV.…”

Section: Research Progress and Implicationsmentioning

confidence: 98%