Production and measurement of flash X-ray dose rates in excess of 10/sup 13/ RAD (CaF/sub 2/)/s

This article describes the design of a very intense source of flash x rays using the HERMES III electron accelerator that delivers a measured peak dose and peak dose rate of (370±58) krad(CaF2) and (3.5±0.7)×1013 rad(CaF2)/s, respectively, over a useful area of 80 cm2, without target destruction. Measured electron and photon source distributions agree with those generated from a numerical model. The quality of the agreement gives credibility to both and validates the main assumptions of the model.

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Very intense source of flash x rays

Sanford

Halbleib

Poukey

et al. 1992

Journal of Applied Physics

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An intense large-volume uniform source of bremsstrahlung for pulsed gamma ray simulation

Sanford

Mock

1992

IEEE Trans. Nucl. Sci.

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the electron beam can be made to impact the target at normal incidence thus minimizing the The intense radiation fields generated with useful pinch and resulting in significantly improved uniformity over large volumes, using the novel radiation uniformity without loss of radiationt,, compound-lens diode on Hermes III, are fluence. 6 The beamin thisdiode is controlled by characterized. The measurements show that by the electrostatic field between the cathode and changing the diode parameters, the peak dose, tapered anode, and an azimuthal magnetic field useful area, and useful volume of irradiation can generated by the external current (lE) flowing be varied from~100 krad(Si),-600cm 2, and through the titanium windows of the lens, as-20x103 cm 3 to 20 krad(Si),-3400 cm 2, and illustrated in Figure lB. By adjusting the shape .... •-.200xi03 cm 3, in a 19:t._2 ns radiation pulse. This of the cathode tip, the anode-cathode (AK) gap, versatility enables radiation fields to be tailored and IE, the radial profile, the radial position, and to a specified exposure requirement, significantly the angle of incidence of the beam at the target enhancing the capability of Hermes IIi to test can be varied. In this paper, we characterize the radiation fields measurezl as a function of these radiation-effectsin systems, adjustments. We show that intense, uniform

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Experimental verification of dosimetry predictions of bremsstrahlung attenuation as a function of material and electron energy

Sanford

Halbleib

Beutler

et al. 1993

IEEE Trans. Nucl. Sci.

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Dose attenuation with depth in an absorber of on-axis bremsstrahlung generated from an electron target is measured and shown to agree within f9% with Monte Carlo predictions as afunction ofabsorber material (Al,Fe,Pb) and incidentelectronbeam energy (5.5-25.1 MeV). For this on-axis bremsstrahlung, 1 to 5 g/cm2 of upstream and 0.2 to 1 @cm2 of downstream AI buffer is sufficient to provide electron equilibration for CaF2:Mn thermoluminescent dosimeters P D s ) over the measured energy range of 5.5 to 25.1 MeV, respectively. Once "effective" equilibration has been established, an expression of the form DA/Q = c,v4e-GvoA, can be used to predict the dose-area (DA) product per absorbed beam charge (Q) at a given incident beam energy (V) in TLDs as a function of depth (A) in absorbers, within a fixed solid angle centered about the beam axis. This expression is quantified for the measurements presented here.

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Production and measurement of flash X-ray dose rates in excess of 10/sup 13/ RAD (CaF/sub 2/)/s

Cited by 5 publications

References 18 publications

Very intense source of flash x rays

Very intense source of flash x rays

An intense large-volume uniform source of bremsstrahlung for pulsed gamma ray simulation

Experimental verification of dosimetry predictions of bremsstrahlung attenuation as a function of material and electron energy

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