peony He PORE ARIA oe
;
dee
he
neh |
ABSTRACT
The spectrometric techniques developed by the authors
for measuring total and individual component gamma dose rates
from naturally-occurring and fallout emitters are elaborated
upon and extended to new applications.
The calibration of
high resolution 4" x 4" NaI(Tl) detectors for such measurements
is described.
Field studies utilizing these techniques
during 1965,
including measurements of gamma dose rates at
approximately 50 ground sites scattered around the United
States as well as on high altitude lakes and in deep mines,
are summarized and the data presented in full.
These results
provide useful information relevant to continuing studies of
the application of field spectrometry to the rapid assessment
of fallout deposition, particularly 137’7cs, the variations of
AeA APape
natural gamma dose rate with time,
and the contributions of
soil beta activity and cosmic radiation to free air ionization
near the air-ground interface.
A detailed description of the
argon-filled high pressure ionization chamber used for total
dose rate measurements is presented.
- 1ii -