THE EFFECT OF COLLIMATION ON THE RESOLUTION AND PEAK-TO-TOTAL RATIO OF A NAI(T1) CRYSTAL,

Abstract

Restricting the incident radiation to a small area of a Na(T1) scintillation crystal improves the resolution and peak-to-total ratio of the spectrometer. This effect was studied with a series of tapered lead collimators, all with the same apex but with differing apertures, in front of a 4 in. by 4 in. diameter NaI(T1) scintillation crystal. Sources of gamma rays with energies from 0.28 to 2.76 Mev were located at the apex of the taper. Optimum resolution of about 25 percent greater than broad-beam resolution was obtained with a 0.25-in. diameter aperture. Anomalous effects were observed with a smaller opening. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 31, 1962
Accession Number
AD0272034

Entities

People

  • F. M. Tomnovec
  • P. A. Read

Organizations

  • Naval Radiological Defense Laboratory

Tags

DTIC Thesaurus Topics

  • Collimators
  • Diameters
  • Electromagnetic Radiation
  • Gamma Rays
  • Ionizing Radiation
  • Nuclear Radiation
  • Radiation
  • Scintillation
  • Spectrometers

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Nuclear and Radiation Engineering.
  • Solar Physics