BUBBLE CHAMBER PHOTOGRAPHY

Journal Article · Mon Jan 01 04:00:00 EST 1962 · J. Phot. Sci.

OSTI ID:4053162

Welford, W T

Optimal conditions for bubble chamber photography are described, the characteristics of a suitable emulsion are derived, and methods of testing emulsions for these characteristics are discussed. Technical aspects for the design and operation of bubble chambers, which have to be taken account of if good photographs suitable for accurate measurement are to be obtained, are enumerated. It is necessary to photograph the bubbles by darkground illumination, and because of light-scattering, the camera lens must be placed at a very small angle away from the direct beam. The short exposure required (100 to 200 mu sec) is given by a xenon flash tube and the critical decision on the magnitude of the scattering angle to be used depends to some extent on the maximum amount of light energy which it is reasonable to expect to obtain from such a flash tube. An orderof-magnitude calculation of the flash-tube energy required is derived. These calculntions show that a 10-joule flash is indicated as the bare minimum. A technique for conducting emulsion distortion tests is described and applied to various commercially available films. The most important part of the specification of the emulsion is concerned with the resolution; it is not vital that the very fastest emulsion should be used, and a medium-speed emulsion such as Panatomic X or Pan F is fast enough. Of the emulsions tested, Ilford S.E.B.C. gave the best resolution but was much too slow. Of the other emulsions, Ilford N.C.S. and Kodak Exp. were best. (BBB)

• Research Organization: Imperial Coll. of Science and Tech., London
• NSA Number: NSA-18-018195
• OSTI ID: 4053162
• Journal Information: J. Phot. Sci., Journal Name: J. Phot. Sci. Vol. Vol: 10
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
BUBBLE CHAMBERS
BUBBLES
CAMERAS
ELECTRIC DISCHARGES
ELECTRON TUBES
FLASH TUBES
IMAGES
INSTRUMENTATION
LENSES
LIGHT
MATHEMATICS
NUCLEAR EMULSIONS
OPERATION
PHOTOGRAPHIC FILM
PHOTOGRAPHIC FILM DETECTORS
PHOTOGRAPHY
RADIOGRAPHY
RESOLUTION
SCATTERING
TESTING
XENON