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alfa-čestica

Čestica koju obično izbacuju radioaktivne jezgre, a sastoji se od dva protona i dva neutrona. Alfa-čestice su jezgre helija. Alfa-čestice imaju masu od 6.644 655 98 × 10-27 kg ili 4.001 506 1747 atomskih jedinica mase (CODATA vrijednosti iz 1998.).

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