A survey of dental X-ray units. Non-invasive measurements of beam quality, radiation outputs and accuracy of timer.

DOI 2 Citations
  • OHKI Masafumi
    Department of Oral Radiology, Nagasaki University School of Dentistry
  • TERADA Kentaro
    Department of Oral Radiology, Nagasaki University School of Dentistry
  • OKANO Tomohiro
    Department of Oral Radiology, Nagasaki University School of Dentistry
  • SUN Hai-Xiong
    Department of Oral Radiology, Nagasaki University School of Dentistry
  • YAMADA Naoyuki
    Department of Oral Radiology, Nagasaki University School of Dentistry

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Other Title
  • 歯科用Ｘ線装置の実態調査　　線質，出力，タイマー精度について
  • ―線質、出力、タイマー精度について―

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Description

Fourty six dental X-ray units used in dental offices and university hospitals were measured in terms of beam quality, radiation outputs and accuracy of timer using a NERO (Non-invasive Evaluator of Radiation Outputs) X-ray beam analyzer. Results were as follows, peak voltage in 87% of units ranged within 10% difference from indicated voltage and its mean was 59.0kVp. Mean half value layer and estimated mean total filtration were 1.92 and 2.0mmAl equivalent thickness, respectively. Mean exposure rate at cone end was 0.73R/s. 90% of units in dental offices showed significant difference between indicated time and actual exposure time below 0.5 sec. These results were compared with the recommendation by ICRP and JIS. Higher accuracy of timer should be required for higher sensitive recording systems.

Journal

  • Shika Hoshasen

    Shika Hoshasen 27 (1), 25-32, 1987

    Japanese Society for Oral and Maxillofacial Radiology

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