Edge method for measuring source spot-size and its principle

Jiangjun, Shi; Liu, Jun; Liu, Jin; Bi-yong, LI

doi:10.1088/1009-1963/16/1/045

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…By collecting the position of gammaphoton emission on the back of the converter, the emission area of the gamma-ray source could be obtained. A knife-edge method was used to measure the spot size in radiography, 34,35 in which an ideal knife edge (a thin knife edge and complete absorption) was used for point projection imaging. By analyzing the image formed by the knife edge, the point spread function of the imaging gammaray source could be obtained, and its FWHM was considered as the spot size (see Appendix B).…”

Section: Comparation Of Experiments and Monte Carlo Simulationmentioning

confidence: 99%

Virtual source approach for maximizing resolution in high-penetration gamma-ray imaging

Wu,

Wang,

Zhu

et al. 2024

Matter and Radiation at Extremes

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High-energy gamma-ray radiography has exceptional penetration ability and has become an indispensable nondestructive testing (NDT) tool in various fields. For high-energy photons, point projection radiography is almost the only feasible imaging method, and its spatial resolution is primarily constrained by the size of the gamma-ray source. In conventional industrial applications, gamma-ray sources are commonly based on electron beams driven by accelerators, utilizing the process of bremsstrahlung radiation. The size of the gamma-ray source is dependent on the dimensional characteristics of the electron beam. Extensive research has been conducted on various advanced accelerator technologies that have the potential to greatly improve spatial resolution in NDT. In our investigation of laser-driven gamma-ray sources, a spatial resolution of about 90 µm is achieved when the areal density of the penetrated object is 120 g/cm2. A virtual source approach is proposed to optimize the size of the gamma-ray source used for imaging, with the aim of maximizing spatial resolution. In this virtual source approach, the gamma ray can be considered as being emitted from a virtual source within the convertor, where the equivalent gamma-ray source size in imaging is much smaller than the actual emission area. On the basis of Monte Carlo simulations, we derive a set of evaluation formulas for virtual source scale and gamma-ray emission angle. Under optimal conditions, the virtual source size can be as small as 15 µm, which can significantly improve the spatial resolution of high-penetration imaging to less than 50 µm.

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Section: Comparation Of Experiments and Monte Carlo Simulationmentioning

confidence: 99%

Virtual source approach for maximizing resolution in high-penetration gamma-ray imaging

Wu,

Wang,

Zhu

et al. 2024

Matter and Radiation at Extremes

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Monte Carlo simulation for bremsstrahlung and photoneutron yields in high-energy x-ray radiography

Xian-Ke

Chen

2010

Chinese Phys. B

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This paper reports on the results of calculations using a Monte Carlo code (MCNP5) to study the properties of photons, electrons and photoneutrons obtained in the converted target and their transportations in x-ray radiography. A comparison between measurements and calculations for bremsstrahlung and photoneutrons is presented. The radiographic rule and the effect of the collimator on the image are studied with the experimental model. The results provide exact parameters for the optimal design of radiographic layout and shielding systems.

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Edge method for measuring source spot-size and its principle

Cited by 2 publications

References 3 publications

Virtual source approach for maximizing resolution in high-penetration gamma-ray imaging

Virtual source approach for maximizing resolution in high-penetration gamma-ray imaging

Monte Carlo simulation for bremsstrahlung and photoneutron yields in high-energy x-ray radiography

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