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Table 1 Estimated annual regional brain cell loss and cell dose per gram tissue from 210Po high energy alpha particles (5.305 MeV) in the proteins and lipids.*

From: Natural distribution of environmental radon daughters in the different brain areas of an Alzheimer Disease victim

Brain structure Emissions Estimated cell loss   Cell dosimetry Energy absorbed Biolgical effectiveness
  Bq•y•g-1 Number %•y-1 βGy•yr-1 mSv•y-1
Amygdale 347 828 1 043 484 16.65 295 5.90
Hippocampus 106 475 319 426 4.99 90 1.80
Temporal lobe 50 078 150 233 2.35 42 0.85 0.79a
Frontal lobe 49 545 148 635 2.32 42 0.84 0.75a
Occipital lobe 43 739 131 217 2.05 37 0.74
Parietal lobe 39 005 117 016 1.83 33 0.66
Substantia nigra 30 855 92 564 1.45 27 0.54
Locus ceruleus 6 848 20 544 0.30 6 0.12
Nucleus basalis 6 848 20 544 0.30 6 0.12
  1. *The average person absorbs ≈450 βGy of cosmic radiation in a year. Since all 210Po radiation is composed solely of alpha particles then a relative effective factor is 20 (1 Sv = 20 Gy) [29].
  2. aMomčilović et al.[2,3].