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biological half life
nucl.phys.	período biológico; vida media biológica
biological half-life ['baɪə(')lɔʤɪk(ə)l'hɑ:faɪf]
chem.	periodo biologico
health.	hemivida biológica; semivida biológica
nat.sc.	periodo de semidesintegración; vida media
radiol.	período biológico
UN, chem.	vida media biológica

biological half life: 3 phrases in 2 subjects

Chemistry	1
Health care	2