Accession Number : AD0745841

Title :   Beam Current Monitoring and Radiachromic Film Dosimetry at the Naval Postgraduate School Linac.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Gray,Frederic Colbert

Report Date : JUN 1972

Pagination or Media Count : 64

Abstract : The beam current monitoring system at the NPS electron Linac was studied to determine its performance under varying conditions of machine operation. The efficiency of the secondary emission monitors (SEM Efficiency), defined as the ratio of SEM current of Faraday cup current, was found to increase with increasing beam energy, increase with the introduction of targets into the beam, and vary erratically with SEM foil surface conditions. No dependence on beam current was observed. The spatial variation of electron fluence (time-integrated flux) was investigated using RACM 203 radiachromic film developed by the EC+G Corporation. The optical density of this film was found to vary linearly with absorbed dose over a range of 5 to 40 megarads. (Author)

Descriptors :   (*LINEAR ACCELERATORS, *DOSIMETERS), ELECTRON BEAMS, NUCLEAR SCATTERING, BREMSSTRAHLUNG, SEMICONDUCTOR DEVICES, CURVE FITTING, GRAPHICS, THESES

Subject Categories : Radiobiology
      Particle Accelerators

Distribution Statement : APPROVED FOR PUBLIC RELEASE