Elapsed time in He-jet systems with long capillaries

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Abstract

A helium-jet recoil-transport system with a 10 m capillary has been developed for the study of short-lived radioactive nuclides produced by cyclotron internal-beam bombardments. The dependence of the speed of the gas and the time spent by the activity in the capillary have been studied by varying parameters of the system such as dimension of the capillary and pressure in the target chamber. Simple equations based on known gas-dynamical properties are compared with the experimental observations. A reasonable agreement between theory and experiment demonstrates the usefulness of the theoretical expressions in optimizing the desired system parameters.

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Work supported by the Atomic Energy Control Board of Canada.

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Copyright © 1975 Published by Elsevier B.V.