Gamma siā-sòaⁿ (gamma ray) tiāⁿ siá chò γ siā-sòaⁿ, sī tiān-chû-pho ê 1 chióng hêng-sek, tī hòng-siā-sèng soe-piàn (radioactive decay) he̍k-chiá tiān-chú chiàⁿ-chú bia̍t-bô (electron-positron annihilation) chit chióng hu̍t-chú ia̍h chhù-goân-chú hoán-èng ê koè-têng--nih lóng ē sán-seng.
γ siā-sòaⁿ pîn-lu̍t chin koân, iok-liōng 1020Hz kaù 1022Hz, pho-tn̂g chin té, iok-liōng 10-14m kaù 10-12m, lêng-liōng chin toā, ē-tit thàng koè kim-sio̍k ham âng-mn̂g-thô͘.
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