Part of the respiratory tract consisting of (1) the anterior nasal passage, and (2) the posterior nasal passage, pharynx and larynx, designated as the ET1 region and ET2 region, respectively, of the Human respiratory tract model as defined in ICRP Publication 130.
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from ICRP Publication 130, 2015
Part of the respiratory tract consisting of the anterior nasal passage (the ET1 region) and the posterior nasal passage pharynx and larynx (the ET2 region) as regions of the Human respiratory tract model.