Sunar gamma, taler kaloktah dados radiasi gamma (simbol γ utawi γ ), inggih punika rupa pénétrasi saking radiasi éléktromagnétik sané medal saking paluruhan radioaktip inti atom.
Punika madaging gelombang éléktromagnétik antuk lantang gelombang pinih éndép, ketahné éndépan saking sunar-X. sareng frékuénsi ring duur 30 exahertz (×1019 Hz), punika ngamedalang wasa foton pinih tegeh. Paul Villard, satunggil kimiawan miwah fisikawan Perancis, ngacunduk radiasi gamma ring warsa 1900 ritatkala melajahin radiasi sané kapancarang olih 3radium. Ring warsa 1903, Ernest Rutherford ngaranin radiasi puniki "sunar gamma" mawit pénétrasiné sané langkung kuat nuju matéri; ring warsa 1900 ipun sampun ngasengguh kalih soroh radiasi paluruhan sané kirang pénétrasi (kacunduk olih Henri Becquerel) sunar alpha miwah sunar béta ring bacakan munggah saking katembusan ipun.
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