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- W93099178 abstract "This chapter reviews the instrumentation required for positron annihilation studies, its recent development, and future outlook. Lifetime measurements are usually made by taking advantage of a special decay scheme of some radioisotopes such as 22Na and 58Co. A pair of detectors, generally fast scintillation counters, is used. One of them detects the time of arrival of the 1.28-MeV gamma ray to indicate the birth of positrons and the other detects the time of arrival of the annihilation gamma rays (about 0.51 MeV), which accompany the annihilations of positrons with electrons. The time duration between the pulses produced by the two detectors is converted into pulse height (amplitude) using the delayed coincidence technique. The measurement of angular correlation between the two annihilation photons can be made by using relatively simple electronic apparatus. The measurement of angular correlation between the two annihilation photons can be made by using relatively simple electronic apparatus. The best detector for a delayed coincidence system detecting gamma-ray coincidence is still the fast scintillation counter. Its adoption as a regular tool in metallurgical laboratories requires instruments simpler that are more reliable to operate and faster than the ones presently available at a reasonable price." @default.
- W93099178 created "2016-06-24" @default.
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- W93099178 date "1979-01-01" @default.
- W93099178 modified "2023-09-25" @default.
- W93099178 title "The Detection of Positron Annihilation Processes in Metals" @default.
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- W93099178 doi "https://doi.org/10.1016/b978-0-12-139150-8.50008-7" @default.
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