Effects of selected materials and geometries on the beta dose equivalent rate in a tissue equivalent phantom immersed in infinite clouds of 133Xe

Journal Article · Sun Jun 01 04:00:00 EDT 1986 · Health Phys.; (United States)

DOI:https://doi.org/10.1097/00004032-198606000-00013· OSTI ID:5224864

Piltingsrud, H V; Gels, G L

Most calculations of dose equivalent (D.E.) rates at 70-micron tissue depths in tissue equivalent (T.E.) phantoms from infinite clouds (radius exceeds maximum beta range in air) of /sup 133/Xe do not consider the possible effects of clothing overlays. Consequently, a series of measurements were made using a 1-mm-thick plastic scintillation detector assembly mounted in a tissue equivalent (T.E.) phantom with an overlay of 70 micron of T.E. material. This assembly was placed in an infinite cloud containing a known concentration of /sup 133/Xe. Material samples were placed at selected distances from the detector phantom, both individually and in various combinations. Pulse-height spectra resulting from beta radiations were converted to relative D.E. rates at a 70-micron tissue depth. The relative D.E. rates were reduced from values with no clothing cover by as little as 45% when placing a single thin nylon cloth 1 cm from the phantom, to 94% for a T-shirt material plus wool material plus denim placed 1/2, 1 and 3 cm, respectively, from the phantom. The results indicate that even loosely fitting clothing can have an important effect on reducing the D.E. rate. Close-fitting clothing appears to provide better protection.

• Research Organization: Food and Drug Administration, Cincinnati, OH
• OSTI ID: 5224864
• Journal Information: Health Phys.; (United States), Journal Name: Health Phys.; (United States) Vol. 6; ISSN HLTPA
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
BETA DECAY RADIOISOTOPES
BETA PARTICLES
BETA-MINUS DECAY RADIOISOTOPES
CHARGED PARTICLES
CLOTHING
DAYS LIVING RADIOISOTOPES
DOSE EQUIVALENTS
EVEN-ODD NUCLEI
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATERIALS
MOCKUP
NUCLEI
PHANTOMS
RADIATION PROTECTION
RADIOISOTOPES
STRUCTURAL MODELS
TEXTILES
TISSUE-EQUIVALENT MATERIALS
XENON 133
XENON ISOTOPES