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KMID : 1145520200060020044
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Journal of Radiopharmaceuticals and Molecular Probes
2020 Volume.6 No. 2 p.44 ~ p.57
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Study on terahertz (THz) photoconversion technology based on hyperfine energy-level splitting of Positronium (Ps) generated from relativistic electron beams
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Min Sun-Hong
Park Cha-Won
Cho Il-Sung
Kim Min-Ho
Ma Suk-Hwal
Hwang Won-Taek
Kim Kyeong-Min
Park Seung-Woo
Lee Min-Young
Kim Eun-Ju
Lee Kyo-Chul
Lee Yong-Jin
Hong Bong-Hwan
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Abstract
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In the state of Positronium (Ps), which is an unstable material created by the temporary combination of electrons and positrons, the imaging technology through photo-conversion methodology is emerging as a new research theme under resonance conditions through terahertz electromagnetic waves. Normally, Positronium can be observed in the positron emission computed tomography (PET) process when an unstable, separate state that remains after the pair annihilation of an electron and a positron remains. In this study, terahertz (THz) waves and Cherenkov radiation (CR) are generated using the principle of ponderomotive force in the plasma wakefield acceleration, and electrons and positrons are simultaneously generated by using a relativistic electron beam without using a PET device. We confirm the possibility of Positronium photoconversion technology in terahertz electromagnetic resonance conditions through experimental studies that generate an unstable state. Here, a relativistic electron beam (REB) energy of 0.5 MeV (γ=2) was used, and the terahertz wave frequencies is G-band. Meanwhile, a THz wave mode converting three-stepped axicon lens was used to apply the photoconversion technology. Through this, light emission in the form of a luminescence-converted Bessel beam can be verified. In the future, it can be used complementarily with PET in nuclear medicine in the field of medical imaging.
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KEYWORD
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Positronium (Ps), photo-conversion technology, terahertz (THz) waves, axicon lens, Bessel beam, relativistic electron beam (REB)
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