DEVELOPMENT OF POCKET CHAMBERS FOR MEASURING BETA RADIATION (thesis)

Technical Report · Sat Jun 01 04:00:00 EDT 1957

OSTI ID:4818054

Johnson, R M

Submitted to Vanderbilt Univ., Nashville. A personnel dosimeter sensitive to beta particles was developed in the shape of a pencil with conducting paper walls and a sensitive volume of the same size as that used in standard gamma chambers. Calibration was carried out using a thin walled cavity in a homogeneous water solution of a beta-emitting isotope. The average energy of electrons in water solutions of the radioisotope and the expected dose rate in an air cavity of the solutions were calculated. The beta calibration cell, pocket ionization chambers, apparatus for measuring gamma and x-ray response of pencils, isotopes used, and plating problems are described. The results of calibration of the various tynes of pocket chambers are summarized in graphs. There was no significant difference in the response to gamma and x rays of the pencils made with magnesium, 2S aluminum, or 24ST aluminum, ut stainless steel gave large variations and was rejected. The advantages of this pencil dosimeter are outiined. Experimental confirmation was obtained for the conclusion that a large part of the dose in a thick absorber irradiated with beta rays is produced by the large number of second ary electrons of very low energies which arise from the degradation of the primary spectrum. (M.C.G.)

• Research Organization: Oak Ridge National Lab., Tenn.
• NSA Number: NSA-16-019187
• OSTI ID: 4818054
• Report Number(s): TID-15691
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
AIR
ALUMINUM
BETA PARTICLES
CONFIGURATION
DIAGRAMS
DOSEMETERS
EFFICIENCY
ELECTRONS
ENERGY
GAMMA RADIATION
HEALTH AND SAFETY
HOMOGENEOUS REACTORS
IONIZATION CHAMBERS
IRRADIATION
LABORATORY EQUIPMENT
MAGNESIUM
MATHEMATICS
MEASURED VALUES
PAPER
PERFORMANCE
RADIATION DOSES
RADIOISOTOPES
SENSITIVITY
SHIELDING
SOLUTIONS
SPECTRA
STAINLESS STEELS
STANDARDS
SURFACES
THICKNESS
VESSELS
VOLUME
WATER
X RADIATION