Accession Number : ADA322603

Title :   A Pressure Ionization Chamber for the Measurement of Neutron Fluxes at Tolerance Level in Portable Instruments,

Corporate Author : ROCHESTER UNIV NY

Personal Author(s) : Dessauer, Gerhard ; White, Frederick A. ; Rouvina, James

PDF Url : ADA322603

Report Date : OCT 1945

Pagination or Media Count : 14

Abstract : The largest daily fast neutron dose considered safe for the human body (tolerance dose) is taken to be 0.01 n units. If this dose is received during an 8 hour working day, The neutron flux has to be such as to provide an average dose rate of 0.01 n units per 8 hours. An instrument of high sensitivity is needed to measure fluxes of such order of magnitude in a reasonably short time and within a reasonably small space. High pressure ionization chambers as well as counters will serve the purpose. Which of the two should be chosen depends on what appears the most satisfactory compromise in fulfilling the following requirements: (1) The instrument should read as nearly proportional as possible to the biological effect, independently of the energy of the fast neutrons. (2) The instrument should have a high neutron to gamma sensitivity ratio, compared with the 100 r Victoreen chamber. (3) The instrument should be of rugged and simple construction and require no accessories that would make the total weight in excess of what is conveniently portable.

Descriptors :   *IONIZATION CHAMBERS, *DOSE RATE, *NEUTRON FLUX, *RADIATION TOLERANCE, PORTABLE EQUIPMENT, HYDROGEN, GAMMA RAYS, FAST NEUTRONS, NEUTRON IRRADIATION, HIGH SENSITIVITY, PROPORTIONAL COUNTERS, ELECTROMETERS, RECOIL PARTICLES.

Subject Categories : Nuclear Instrumentation
      Radiobiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE