10
LOCKHART AND PATTERSON
RADON CONCENTRATION (pCi/m3)
300
© ASSUMES SECULAR EQUILIBRIUM
OF RADON SERIES
CORRECTED FOR NONEQUILIBRIUM
OF SERIES
200h-
(WITH COLLECTION TIME AND
STANDARD ERROR INDICATED)
100}-
&
oO
mB
08
Orr f
ogl_l te
0700
an
b--- ~=-5
0800
L
MEASURED p VALUES
Bm Ge
.
l
0900
é
-7
1000
1200
1300
i400
Moo
JANUARY 5, 1I965-EASTERN STANDARD TIME
Lec
Tt
_
1500
1600
Fig. 9 — Atmospheric radon concentrations on January 5, 1965
m. 300f>
S
~
S
& 200}-
-&
Go
a
‘.
‘Sy
.
ae
x
ASSUMES SECULAR EQUILIBRIUM
OF RADON SERIE S
CORRECTED FOR NON-EQUILIBRIUM
OF SERIES
(WITH COLLECTION TIME AND
STANDARD ERROR INDICATED)
~
b
z
~~
~~
iad
8
y
Z
~
~~
=
7
ao
>
100 ;—
a
at
ox
°
MEASURED » VALUES
OB
* o7lk
O6
ne eee
'
$----$TT Fe ? ae TTT
0800
|
0900
}
1000
al
1100
1
1200
l
1300
l
1400
JANUARY 7, (965- EASTERN STANDARD TIME
!
1500
i
1600
ia
paren ae eee
Fig. 10 — Atmospheric radon concentrations on January 7, 1965
vs
encountered during the experiment. Account has
been taken of the changes in p with time during
the collections as described in the Appendix (this
was ignored in the general solution of the experi-
7
me
ariseRtge ats eg ae apne
oRTag
mental procedure), the changing composition
rns enrsian
caused by withdrawal of samples, and the backgroundof other airborne radioactivity. The agree-
mentis entirely satisfactory in view of the difhiculty
ae
~~
a
in setung an exact zero time for introduction of
the radon, which was degassed from a radium
solution, and the impossibility of evaluating the
affect of the chamber walls both in removing
aerosols and in removing radioactive atoms or
ions. This wall effect could result in the lower
p values observed and in the lack of closer approachment to the 0.735 equiltbrium value.
The lack of quantitative agreement between the
measured radon concentrations and the added
quantity of radon was rather disturbing. Studies
currently underway, however, show that there is
a decided wall effect and that the chamber surfaces are in competition with the aerosol for
attachment of the radioactive atoms or ions of
the radon decay products and that, in the absence