Radon-222 Decay Chain
Radon-222
222
86
days
Poloniu
n-218
Polonium-210
Polonium-214
218
84
218
84
210
84
Bismuth-214
Bismuth-210
.0002 s iconds
days
3 m
138
nutes
214
83
214
83
-210
Leac
-206
Lead
-214
Lead
5 days
19.7 minutes
206
82
214
82
214
22 years
Stable
28.6 minutes
Key
Alpha particle: ()(,
Beta particle:
P
In the example, Rn is the atomic symbol for
the element Radon. The number 222
Rn > indicates the atomic mass of the element (or
isotope). The number 86 represents the
element's atomic number.
** rnA United States	RadTown Radon Activity Set	EPA402-B-19-057
Environmental Protection
VU Agency	https://www.EPA.gov/RadTown/Activity-4-Half-Life-Radon

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