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GLle REVIEW AUTHORED BY:
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REVIEWER {A0D):
NAME:
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UNIVERSITY OF CALIFORNIA, RADIATION LA8ORATORY, HEALTH PHYSICS GROUP
REPCRP CN EACKGRCUND STUDIES MADE IN
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OE TERCAMATION CIRCLE NUMBER(S)]
CONNESTION WiTli CPXRATION GREENHOUs
Introduction
————
MHoe
2-CLASORCATION CHANGED TO:
J.CONTAINS NO DOE CLASSIFIED INFO
COCROINATE WITH:
AOehr 7&3
GLI ASSICATION CANCELLED
PCLASSIPED INFO BRACKETED
TEER ISPECIEY):
On April 14, 1951 at the request of the Atomic Energy Commission™
group put into operation the necessary equipment to make background measurements of the
outside atmosphere.
Description of Hoauipment and methods used
Two Victoreen thin wall Al. Geiger tubes were employed to sample the outside atmosphere.
The Geiger tubes were mounted at the ena of a plastic cylinder whose measurements
were &' in length and 6" in diameter.
and sampled by the Geiger tubes.
Outside air was drawn through the plastic cylinder
One Geiger tube was connected to a counting rate meter
which in turn was connected to an Hsterline Angus recorder.
The second Geiger tube was
connected to a conventional scaler and register.
Semples of rainwater were also collected and processed in the following manner:
The sample was collected from the roof of one of the Laboratory buildings by means of
attaching a 5 gallon receptacle to a convenient down-spout.
through several pieces of 70 Whatman filter paper.
was evaporated onto a counting plate.
The sample was then filtered
The paper was aShed and an aliquot
The plate was counted with an end window Geiger
tube connected to a scaler and register.
Prior to taking the rain samples the roof was
washed down several times for two reasons,
First to remove any contamination and secondly
to establish some sort of a normal background for this particular roof.
Results
On two occasions the Geiger tubes indicated an increase in background.
The dates
and times are as follows:
PF rom
2100 + 4/25/51
1830 - 5 25/51
~~
f
To
er
Factor of
0700 - 4/26/51
1930 - §/25/51
on
Aut! St
OPENNET ENTRY
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2
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—
Both of the above increases were detected by. the Health Chemistry group using the well
xnown filter paper method to sample the air (see Health Chemistry report).
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nos ARCHIVES