Photon-scattering, electron-loss and shadow-effect correction factors calculation for cylindrical free-air chamber

Huang, Tseng-Te; Chu, CH; Lin, Yi‐Chun

doi:10.1016/j.radphyschem.2017.03.006

Cited by 5 publications

(2 citation statements)

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“…The charged particles which are liberated by photons at the collecting volume are produced by the interaction of photons with the medium. There are two types of photons; primary photons that enter the chamber, and secondary photons that interact and generate the charged particles in the collecting volume [7][8][9]. The scattering photons are excluded in the kerma definition.…”

Section: Electron Loss and Photon Scattering (K E And K Sc )mentioning

confidence: 99%

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Development of the primary standard for low-energy and W/Mo mammography x-rays at OAP, Thailand

Rindhatayathon¹,

Koonkana²,

Pungkun³

2021

Metrologia

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Free-air ionization chambers (FAC) are accepted as the primary standard of x-ray dosimetry. The low-energy x-rays are important for basic beam quantities of diagnostics at the mammography level. This research explains the FAC characteristics of the Office of Atoms for Peace (OAP) that was developed by cooperation between the OAP, Thailand, and the Korea Research Institute of Standards and Science, Republic of Korea. The applied correction factors that are necessary for determination of the air kerma rate were investigated using an experimental method and Monte Carlo simulation methods with their uncertainties. The beam characteristics, computed using the Monte Carlo method and demonstrated in this paper, are important for calculation of the correction factors. Finally, the correction factors and uncertainties of the standard beam qualities, which are recommended by the Consultative Committee for Ionizing Radiation, and W/Mo beam qualities are shown in this paper.

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Section: Electron Loss and Photon Scattering (K E And K Sc )mentioning

confidence: 99%

“…The electrons can escape outside the measurement volume. Thus, the compensation of electrons that escape to the outside should be taken into account as the correction factor [7]. The correction factor for electron loss can be expressed by…”

Section: Electron Loss and Photon Scattering (K E And K Sc )mentioning

confidence: 99%