ay atinn
As noted in the e&
eynacoresr
from natural sources 1
COS omrem per year.
About half of this
,
sfeeng).
exm
1 5
e | due to
rttye ate manter
cosmic rays plus rad:
earth's crust.
i
The vt
the
ve curring
elements taker inta +,
bn,
natural radiation exo
guideline fcr con’r:s'
ar
org
+
v
aty
UP
traathe
wp
a
t
te Federa’
ra eratian
made
wee BYDC
On a Pacrfee see
Thic
res
ta
naturally occurriss “Jatitude, }tw ele.a°
in the soi? resuli
iv
ou
Northern Marsha: !
earth's crust ard tre:
Soe uer
radioactive mater.a
rf
per year in the Morsn.
ano) +
Measurements o
‘.
ragsdante
indicate that the nat.
mort pf
Pray tac
the internal exposure,
occurring radiation co’
22 vrar
ale
a
]00 mrem per year fer
Ae
mos
4
nm
i
yhorall.,
t-
about 53 mrem per yea
U.S.
As with Tolalt.r,
in the soil of laic ar:
the atmosphere.
ac73"
source for doth iiter’:
a tpi ge
nF
in| tams-
aor
aon
Faint
tacting
In
addt+innal
op
thy