University of California Ernest 0. Lawrence Radiation Laboratory
Berkeley, California
Air samples taken daily M, T, W. Th, P, and F - M at 4& CFM thru
kh” x 9" HV¥-70 paper at Building 70 air intake. Beta-gamma activity
estimated periodically thereafter by dispos
collections about Geiger
tube in 1" thick lead pig. Conversion to pe n> is obtained by the expression
counts /min x 15-9
7)
employing an average of 6 counting determinations for.) minute for each
entry. The instrument is standardized daily to a
foil cylinder sealed
in epoxy resin. Background average for year is 21 counts per minute,
maximum 26 c/m, minimum 16 c/m.
Alpha activity is determing02 & proportional chamber gas-flow
counter standardized daily to PucS~’. Background is 1 count per minute.