Integral dose measurement in the routine intra-oral radiographic procedure

Radio-abstracts

Integral

dose

measurement

in the

routine

intra-oral

T. Murai, T. Sasaki, H. Inomata, and T. Hitomoto. Univ. 10: 523-531, 1963.

radiographic

procedure.

Bull. Tokyo Med. & Dent.

I

ntegral dose is more meaningful than skin dose in assessing t,he degree of hazard to the patient from dental x-ray procedures. lntegral dose was measured by means of a scintillator phantom, 28 by 28 by 15 cm. in size, made of a tissucequivalent plastic. The light emitted by the irradiated scintillator produced an electrical current in a photomultiplier tube. This current was proportional to the absorbed dose rate in the plastic scintillator phantom. After suitable calibration, the device was used with a dental x-ray machine operated at 60 kv. and 10 Ma. In a complete periapical survey of the mouth, which required a total of 10 seconds of exposure, the total integral dose to the patient was estimated to be about 2,000 gram-roent,gens. The integral dose values obtained in this stud! were in substantial agreement with values obtained by others using different methods of measurement.

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