Effect of γ-irradiation on the temperature coefficient of surface resistivity of two-dimensional island platinum films

Bishay, A. G.; El‐Gamal, S.

doi:10.1016/j.nimb.2011.02.003

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…Regarding the dependence of G ac on dose, it is expected that as the dose increases the energy supplied to islands increases and this will decrease the cohesive force between the free electrons and the positive ion cores inside them [27]. In that case the adhesive force between islands and the substrate will be larger as compared with the cohesive force; accordingly the shape of islands will be modified such that they are elongated parallel to the substrate surface.…”

Section: Discussionmentioning

confidence: 99%

A. c. conductance of γ-irradiated discontinuous platinum films

Bishay

El‐Gamal

2013

J Mater Sci: Mater Electron

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Four films (A, B, C and D) of discontinuous platinum films (D(Pt)Fs) whose mass thicknesses (d m ) are 10, 20, 30 and 40 Å , respectively were deposited onto Corning 7,059 glass substrates at ambient temperature via the thermal evaporation technique. Each film was c-irradiated by different doses, namely, 100, 200, 300, 500 and 700 Gy; this was done by using 137 Cs (0.662 MeV) radiation source of dose rate 0.5 Gy/min. For each dose, the d. c. and total resistance of the Pt films were measured; in that way the a.c. conductance G ac of the films could be determined. It was found that: (1) G ac increases as the dose, d m and the angular frequency x of the voltage imposed on the film increases (2) the c-irradiation has modified the shape of islands such that they are elongated parallel to the substrate surface and thus the inter-island spacings have decreased. This elongation has been confirmed via micrographs taken by the atomic force microscope. To account qualitatively for the results of G ac it was assumed that, the a.c. conductance of D(Pt)Fs is due to the hopping of electrons through the sites which exist on the substrate surface between two adjacent islands.

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Section: Discussionmentioning

confidence: 99%

A. c. conductance of γ-irradiated discontinuous platinum films

Bishay

El‐Gamal

2013

J Mater Sci: Mater Electron

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Effect of γ-irradiation on the gauge factor of two-dimensional island platinum films

Bishay

El‐Gamal

2012

Radiation Physics and Chemistry

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Performances of a boron-lined ionization chamber used in neutron/-ray mixed field of reactors

Chen¹,

Xin²,

Huang³

et al. 2012

Acta Phys. Sin.

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Boron-lined ionization chambers (BLICs) have gradually become one of radiation detectors which are used to monitor the neutron/-ray mixed field with large flux around reactors in recent years. In this paper a BLIC with high sensitivity is fabricated and the internal structure is detailed. By using a weak current amplifier with an accuracy of fA, the leakage current of the BLIC is less than 1.0 pA when the high voltage is below 700 V; under the irradiation by the Am-Be neutron source, on the I-V curve of the BLIC there appears a current plateau with a length of 500 V and a slope of 3.7210-4 V-1; when the operating voltage is 400 V, the leakage current of the BLIC is 0.4 pA. Experiments show that neutron signal current measured by the BLIC depends on the relative position of the BLIC with repect to the radiation source; a maximum of 2.0 pA is obtained when the source is 8 cm away from the bottom of the hole in the paraffin moderator. Under the exposure by 137Cs and 90Sr,-ray signal current measured by the BLIC is 1.02.0 pA, but the current plateau is not obvious in-ray field. The neutron sensitivity of the BLIC reaches a level of 1.010-15 Acm2s and the-ray sensitivity reaches a level of 9.010-22 Acm2seV-1. The BLIC shows small leakage current, high sensitivity, and good plateau characteristics, which can be used to monitor the neutron/-ray mixed field around reactors.

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Effect of γ-irradiation on the temperature coefficient of surface resistivity of two-dimensional island platinum films

Cited by 3 publications

References 27 publications

A. c. conductance of γ-irradiated discontinuous platinum films

A. c. conductance of γ-irradiated discontinuous platinum films

Effect of γ-irradiation on the gauge factor of two-dimensional island platinum films

Performances of a boron-lined ionization chamber used in neutron/-ray mixed field of reactors

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