Radiation shielding implications of computed tomography scatter exposure to the floor

Steve G. Langer, Joel E. Gray

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This article investigates whether CT scanners used primarily for either head or body work have scattered radiation levels that may impact shielding considerations. Several 35 x 43 cm film cassettes were used to cover the floor area around a General Electric Hi-Speed Advantage CT unit. Regions of maximum exposure were identified (visually with sensitometric confirmation). An ion chamber was used to obtain radiation exposure levels for typical head and body protocols. Greater scattered radiation was found behind the gantry for head scanning (20 vs. 16 μGy for a body scan) while greater scatter was observed in front of the scanner for body scans (46 vs. 31 μGy for the head scan). The resulting annual doses to the floor from typical workloads (assuming 32 cases a day) can be as great as 0.63 Gy for head protocols or 1 Gy from body work. Care may be needed to assure adequate shielding for floor areas near CT scanners specializing in either head or body work. Also, while increased throughput with helical scanners is currently x-ray tube heat limited, shielding plans should allow for enhanced heat capacity (and greater throughput) in future generation scanners.

Original languageEnglish (US)
Pages (from-to)193-196
Number of pages4
JournalHealth Physics
Volume75
Issue number2
StatePublished - 1998

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Radiation shielding
radiation shielding
scanner
Shielding
tomography
Tomography
scanners
Head
Radiation
Throughput
shielding
Ionization chambers
Specific heat
Hot Temperature
radiation exposure
heat capacity
Scanning
gantry cranes
x ray tubes
X rays

Keywords

  • Exposure, personnel
  • Medical radiation
  • Scattering
  • Shielding

ASJC Scopus subject areas

  • Environmental Science (miscellaneous)
  • Health, Toxicology and Mutagenesis
  • Toxicology
  • Physics and Astronomy (miscellaneous)
  • Public Health, Environmental and Occupational Health
  • Environmental Chemistry
  • Environmental Science(all)

Cite this

Radiation shielding implications of computed tomography scatter exposure to the floor. / Langer, Steve G.; Gray, Joel E.

In: Health Physics, Vol. 75, No. 2, 1998, p. 193-196.

Research output: Contribution to journalArticle

Langer, Steve G. ; Gray, Joel E. / Radiation shielding implications of computed tomography scatter exposure to the floor. In: Health Physics. 1998 ; Vol. 75, No. 2. pp. 193-196.
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