Paul Villard, a French physicist, is credited with discovering gamma rays. Most sources put this in 1900, although I've seen a few sources use 1898. Villard recognized them as different from X-rays (discovered in 1896 by Roentgen) because the gamma rays had a much greater penetrating depth. It wasn't until 1914 that Rutherford showed that they were a form of light with a much shorter wavelength than X-rays.
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John Ray
To measure Gamma Ray exposure.
Geoffrey N. Pendleton has written: 'BATSE data analysis' -- subject(s): Gamma ray bursts, Observations
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Tau gamma phi