Accession Number : AD0639919

Title :   COMPUTATION OF NUCLIDE YIELD IN A 60-INCH CYCLOTRON.

Descriptive Note : Technical memo.,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Liben,W.

Report Date : JUL 1966

Pagination or Media Count : 73

Abstract : Two procedures are described for computing the yield of isotopes in a 60 in. cyclotron. Both are based on the basic yield equation sigma(E)N sub p(N sub T), where sigma is the excitation function, N sub p the number of bombarding particles, and N sub T the number of target atoms. The excitation function is only available from laboratory measurements. N sub p is proportional to the cyclotron beam current and is constant with time and position in the target, but the particle energy decreases as it penetrates into the target. The yield depends upon N sub p(N)(sigma)dx where N is the number of target atoms per cubic centimeter and dx is a thin slice of the target. A rough approximation to the yield is possible if sigma is taken to be constant, the yield is then given by N sub p(N)(sigma) (Range). The stopping power dE/dx is discussed in detail, including methods for computing the function. Detailed computations are given for the B10(dn) C11 reaction using rough and more exact procedures. In the Appendix are collected the yield curves for a few short-lived isotopes useful in making radiopharmaceuticals. (Author)

Descriptors :   (*CYCLOTRONS, PARTICLE BEAMS), (*RADIOACTIVE ISOTOPES, PRODUCTION), PARTICLE ACCELERATOR TARGETS, EXCITATION, EQUATIONS, BORON, DEUTERON BOMBARDMENT, NEUTRON REACTIONS, CARBON, NUCLEAR CROSS SECTIONS, DRUGS

Subject Categories : Pharmacology
      Particle Accelerators
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE