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

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.*

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 0.79^a
Frontal lobe	49 545	148 635	2.32	42	0.84 0.75^a
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

*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].
^aMomčilović et al.[2,3].

ISSN: 1750-1326