EMULSION PACK - PRINCE ALBERT PROJECT

This balloon flight was performed as part of an extensive study of heavy primaries, particularly in the lower energy region by a collaboration between the cosmic ray group of the Institute for Nuclear Study, of Tokyo University and the University of Chicago. The effort was denominated "the Prince Albert Project" as the balloon flight was performed from that city of Canada.

At left can be seen a schematic view of the emulsion stack. It was composed by two hundred pellicles of Ilford G-5 nuclear emulsions of 4 inches by 6 inches, and 600 µ in thickness. These were stacked underneath a moving-plate mechanism consisting of two horizontal Lucite plates, 6 inches by 6 inches each, coated with 200 µ thick G-5 emulsion. A glass-backed G-5 emulsion and a pellicle, each 6 inches by 6 inches and 600 µ in thickness, were inserted between the stack and the moving-plate mechanism for the purpose of correlating the tracks passing through the whole system. An additional glass-backed G-5 emulsion also measuring 6 inches by 6 inches and 600 µ in thickness was placed horizontally on the very top of the assembly, its emulsion surface facing upward. The whole assembly was rigidly mounted into a pressurized aluminum sphere.

Balloon launched on: 9/11/1957 at ~ 4:10 cst
Launch site: Prince Albert Airport, Saskatchewan, Canada  
Balloon manufacturer/size/composition: Zero Pressure Balloon  
End of flight (L for landing time, W for last contact, otherwise termination time): 9/11/1957 at ~ 16:10 cst
Balloon flight duration (F: time at float only, otherwise total flight time in d:days / h:hours or m:minutes - ): F 11 h

• Heavy Nuclei in the Primary Cosmic Radiation at Prince Albert, Canada. I. Carbon, Nitrogen, and Oxygen Phys. Rev. 116, 436 - Published 15 October 1959
• Heavy Primary Cosmic Radiations Observed on 11 Sept. 1957 at Prince Albert, Canada Journal of the Physical Society of Japan, Vol. 17, Supplement A-III, 1962, p.38
• Heavy Primary Cosmic Radiations ---Prince Albert Project--- Progress of Theoretical Physics Supplement, No. 16, pp. 54-168
• Interpretation of the energy spectra of heavy primary cosmic rays 6th International Cosmic Ray Conference, Moscow, 1960, Vol.3, P. 181
• Isotopes in Extraterrestrial Materials Journal of the Mass Spectrometry Society of Japan, 1963-1964, Volume 11, Issue 22, Pag. 1
• The Primary cosmic radiation at Prince Albert, CANADA 6th International Cosmic Ray Conference, Moscow, 1960, Vol.3, P. 96