Abstract
Electron generation from a gas jet irradiated by low-energy femtosecond laser pulses is studied as a promising source of ∼1 MeV radiation for radioisotope-free γ-ray imaging systems: “virtual radioisotopes”. The yield of γ-rays in the 0.5–2 MeV range produced by low-average-power lasers and gas targets exceeds the yields from solid tape targets up to 2 orders of magnitude; it can be competitive with the yield from conventional radioisotopes used in industrial applications.
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