Anomaly in the interaction between microfocus bremsstrahlung from a new 18 MEV betatron-based source and a sharp edge of a steel plate

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Abstract

Images of the distribution of microfocus bremsstrahlung from a new source based on an 18 MeV betatron, which has passed a 0.4 mm thick steel plate with a 1.2 mm wide sharp edge, are presented. The photographs demonstrate an anomaly in the interaction between the microfocus bremsstrahlung and the plate tip in the form of a narrow dark stripe along the tip image, which indicates an increase in the radiation intensity in this area. The dark stripe provides a contrast in the tip image, which, together with the high sharpness due to the microfocus of the source, allows the tip position to be visualized with high precision. The dark stripe in the images was not observed when using radiation from 450 and 45 keV X-ray tubes with foci of 400 and 100 µm. The absorption of radiation ensures a smooth change in the blackening of the sharp edge and blurring of the tip in the image due to the size of the radiation source. The observed effect with microfocus radiation of the new source is determined by the scattering of radiation by the tip with the possible participation of wave effects, which needs to be further investigated.

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About the authors

M. M. Rychkov

National Research Tomsk Polytechnic University

Author for correspondence.
Email: rychkov@tpu.ru
Russian Federation, Tomsk

V. V. Kaplin

National Research Tomsk Polytechnic University

Email: rychkov@tpu.ru
Russian Federation, Tomsk

V. A. Smolyanskii

National Research Tomsk Polytechnic University

Email: vsmol@tpu.ru
Russian Federation, Tomsk

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2. Fig. 1. Schematic diagram of the experiment (a): 1 — betatron chamber (top view); 2 — target oriented along the electron beam; 3 — goniometer; 4 — steel plate with a sharp edge located at a distance L1 from the target; 5 — X-ray film located at a distance L2 from the target. Photograph (b) (magnification M = 1.1) showing the position of the plate (1) with the left sharp edge on the radiation beam and the thick steel plate serving as a holder (2). The light line shows the direction of the target plane. Schematic diagram of the dependence of the effective horizontal size of the SH source on the horizontal angle θH of radiation emission from a target of thickness t and width T oriented along the electron beam e (c).

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3. Fig. 2. Fragment of the bremsstrahlung distribution obtained with magnification M = 2.43, generated in a narrow (t = 13 μm) Ta target of the 18 MeV betatron, after its interaction with a 0.4 mm thick steel plate with a left sharp edge 1.2 mm wide (a), below — an additionally enlarged part of the plate tip image. Densitogram of the sharp edge, measured along the L line (b). Fragment of the bremsstrahlung distribution with magnification M = 1.1 (c), below — an additionally enlarged part of the plate tip image. Densitogram of the sharp edge (d).

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4. Fig. 3. Fragment of the distribution of X-ray bremsstrahlung with an energy of 450 keV obtained with magnification of M = 2.3, having passed through a 0.4 mm thick steel plate with a left sharp edge (a); at the bottom — an additionally enlarged part of the plate tip image. Densitogram of the sharp edge, measured along the line L (b). Fragment of the enlarged (M = 4.3) image of a 0.4 mm thick plate with a left sharp edge, obtained using X-ray radiation with an energy of 45 keV (c). Densitogram of the image of the sharp edge, measured along the line L (d). Fragment of the enlarged (M = 4.3) image of a 0.1 mm thick plate with a left sharp edge 0.4 mm wide, obtained using X-ray radiation with an energy of 45 keV (d). Densitogram of the sharp edge, measured along the line L (e).

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5. Fig. 4. Calculated normalized distributions of the brightness of the tip image of a plate with a thickness of: a – 0.4 mm for photon energies of 400 (1), 200 (2) and 100 keV (3); b – 0.4 mm for photon energies of 40 (1), 30 (2) and 20 keV (3); c – 0.1 mm for photon energies of 40 (1), 20 (2) and 15 keV (3).

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