Radiation Dosimetry by Transparent Plastics

Boag, J. W.; Dolphin, G. W.; Rotblat, Joseph

doi:10.2307/3570706

Cited by 91 publications

(12 citation statements)

References 2 publications

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“…Day and Stein [1] have suggested the use of changes in optical density of plastics, due to irradiation as a means of dosimetry. Such changes in optical density have been observed for polycarbonate films [2] due to gamma irradiation. Frank and Benton [3] have also investigated Lexan polycarbonate plastic and found that this can be utilized in measuring absorbed gamma doses.…”

Section: Introductionsupporting

confidence: 60%

Gamma and neutron dose measurements with solid state nuclear track detectors

Kalsi

2009

Indian J Phys

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An attempt has been made to explore the possibility of using solid state nuclear track detectors for the estimation of gamma and neutron doses based on the use of changes in activation energy of degradation of these detectors, due to irradiation (gamma/neutron), as a means of dosimetry. Thermogravimetry (TG) has been applied as a tool for these studies carried out on Lexan and CR-39 track detectors. A linear relationship observed between the decrease in activation energy and the dose (gamma/neutron) received by the detectors suggests the possibility of the use of these detectors as gamma and neutron dosimeters.

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Section: Introductionsupporting

confidence: 60%

Gamma and neutron dose measurements with solid state nuclear track detectors

Kalsi

2009

Indian J Phys

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“…The chamber collection efficiency at the dose rate employed, about 40 krad./min., was approximately 95 % so that small changes in the dose rate did not cause uncertainty in the estimation of the dose. The ionization chamber was calibrated using Perspex dosimetry (Boag, Dolphin & Rotblat, 1958). The Perspex slips used for the calibrations were placed in the same positions as the organisms to be irradiated.…”

Section: Experimental Methodsmentioning

confidence: 99%

The use of radiation to estimate the numbers of micro-organisms in air-borne particles

Lidwell

Noble

Dolphin

1959

J. Hyg.

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The form of the killing curve obtained by bombaring micro-organisms with high energy electrons enables an estimate to be made of the numbers of individual viable organisms present in the aggregates or clumps comprising the sample. Samples of Staph. aureus collected from the air of two hospital wards have been found to consist of aggregates containing, on the average, only about four viable cocci per air-borne particle. These samples were taken during quiet periods and during periods of active dispersion of the organism but there was no active spread of staphylococcal disease at any time.The work on the linear accelerator was carried out with the aid of grants provided by the Treasurer and the Board of Governors from the Discretionary Fund of St Bartholomew's Hospital, to whom we wish to express our gratitude.

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“…Also illustrated is the calibration curve for measurements at 394 mp using a spectrophotometer. An over fivefold increase in sensitivity is obtained giving a sensitivity over twice that obtained with clear Perspex of this thickness (Boag, Dolphin and Rotblat 1958). This peak can be utilized, using the white light photometer, by employing a filter designed to accept only the changes in absorption at about 400 mp, A number of such filters were tried and met with varying degrees of success, depending essentially on how well the absorption between 600 and 690 m p (the limit of the photocell) was eliminated.…”

Section: Asmentioning

confidence: 77%

Commutative collections of functions on orbits of finite-dimensional Lie algebras in general position

T'euen¹

1983

Russ. Math. Surv.

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The radiation induced optical absorption in Perspex ' Red 400 ' manufactured hy Imperial Chemical Industries Limited, has been investigated with reference to its use in the dosimetry of high doses of ionizing radiation. It is found that this Perspex can he divided into three distinct types, each having a particular dyestuff formulation. The type currently available commercially exhibits two peaks in the induced absorption spectrum, at 613 mp and 394 mp. The highest extinction coefficient is obtained by measuring at 394 mp with a spectrophotometer, in n-hich case the optical density change in 0.15 cm thick samples is a linear function of dose between 0.2 and 1.5 nn-ad. A method has bcen developed which requires only a simple white light photometer with suitable optical filtration, with a reduction in sensitivity of not more than 50O;.

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Radiation Dosimetry by Transparent Plastics

Cited by 91 publications

References 2 publications

Gamma and neutron dose measurements with solid state nuclear track detectors

Gamma and neutron dose measurements with solid state nuclear track detectors

The use of radiation to estimate the numbers of micro-organisms in air-borne particles

Commutative collections of functions on orbits of finite-dimensional Lie algebras in general position

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