322
FEELY AND BAZAN
but during 1963 '4sb was used as a unique tracer for certain December
1962 events.
SUMMARY
The distribution of °°Sr and of other components of nuclear debris
in the stratosphere may be determined with fair accuracy by using
data from the balloon-sampling program and the Project Star Dust
WU-2 aircraft sampling program. The distributions of *"Sr observed
during 1962 to 1964 provide information on the initial altitude of injection of debris from U.S.S.R. polar tests andon the seasonal nature of
changes in the stratospheric distribution. Specifically, it would appear
that little debris injected into the polar stratosphere, even by events
of very high yield, stabilizes at altitudes above 70,000 ft. Movement
of debris from the northern-hemisphere source regions into the
southern hemisphere appears to occur preferentially during the autumn
and winter seasons of the southern hemisphere. Measurements of
other fission products and of a number of products of neutron activation
should also be useful for studying atmospheric motions.
REFERENCES
1. L. P. Saiter, High Altitude Balloon Sampling Program, in Fallout Program
Quarterly Summary Report, USAEC Report HASL-140, pp. 166-214, Health and
Safety Laboratory, Oct. 1, 1963.
2. L. P. Salter, High Altitude Balloon Sampling Program, in Fallout Program
Quarterly Summary Report, USAEC Report HASL-149, pp. 54-99, Health and
Safety Laboratory, Oct. 1, 1964.
3. H.W. Feely, B. Davidson, J. P. Friend, R. J. Lagomarsino, and M. W. M. Leo,
Ninth Quarterly Report on Project Star Dust, Report DASA-1309, Defense
Atomic Support Agency, Sept. 1, 1963.
4. H. W. Feely and F. Bazan, Second Interpretive Report on the High Altitude
Balloon Sampling Program, USAEC Report NYO-10498, Isotopes, Inc., June 10,
1964,
5. F. Bazan and H.W. Feely, First Quarterly Report on the High Altitude Balloon
Sampling Program, USAEC Report NYO-10496, Isotopes, Inc., Feb. 1, 1964.
6. L. P, Salter, Results of Measurements Made at HASL and Reported at a Conference Held at the New York Operations Office, AEC, on Dec. 6, 1963.
7. M. I. Kalkstein, Rhodium-102 High Altitude Tracer Experiment, Science, 137:
645-652 (1962).
8. J. P. Friend, H.W. Feely, P. W. Krey, J. Spar, and A. Walton, The High Altitude Sampling Program, Report DASA-1300, Defense Atomic Support Agency,
Aug. 31, 1961.
9. U.S, Weather Bureau, Announced Nuclear Detonations, 1945-1962, in Fallout
Program Quarterly Summary Report, USAEC Report HASL-142, pp. 218-242,
Health and Safety Laboratory, November 1963.