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Which decay product increases helium concentration after leak?

A)Alpha particles capturing two electrons
B)Beta decay emitting antineutrinos freely
C)Gamma radiation ionizing nearby air
D)Spontaneous fission producing stable krypton

💡 Explanation

Helium results from alpha decay when an alpha particle captures two electrons; because alpha particles are helium nuclei. This increases He partial pressure; therefore He concentration rises rather than from particle radiation or spontaneous fission processes.

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