A method for evaluating the entrance surface dose from the measurement of exposure and half value layer in intraoral radiography using a radiophotoluminescent dosemeter.
A method for measuring entrance surface dose in intraoral radiography for nationwide survey for the determination of guidance levels was developed using a commercially available radiophotoluminescent dosemeter (RPLD) system. From the ratio of the readings of the RPLD detectors. with and without a 1 mm thick aluminium filter, half value layer (HVL) and the energy dependency correction factor were derived. HVL and exposure for intraoral radiography were obtained with uncertainties of +/- 0.11 mmAl (SD) and +/- 2.1% (CV), respectively. This has been achieved by calibration at various beam qualities used in intraoral radiography. The HVLs and outputs of intraoral radiography units were measured by means of the mailed RPLD holders and also by ionisation chambers in 19 dental schools in Japan. Results obtained from the two methods of measurement agreed well for both HVLs and outputs.
Katoh
T
T
School of Radiologic Science, Tokyo Metropolitan University of Health Sciences 7-2-10 Higashi-Ogu, Arakawa-ku, Tokyo, Japan 116-8551.
Sasaki
T
T
Iwai
K
K
Okano
T
T
Satoh
K
K
Shimano
T
T
Hayami
A
A
Wada
S
S
Juto
N
N
D000388:Air; D000390:Air Ionization / Q000528:radiation effects; D000535:Aluminum; D002138:Calibration; D004307:Dose-Response Relationship, Radiation; D006801:Humans; D007564:Japan; D008163:Luminescent Measurements; D011093:Polyethylene Terephthalates; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000295:instrumentation*; D011861:Radiography, Dental; D011874:Radiometry / Q000379:methods*; D012542:Scattering, Radiation; D012575:Schools, Dental; D014867:Water
D011093:Polyethylene Terephthalates; D014867:Water; D000535:Aluminum