Electromagnetic malfunction of semiconductor-type electronic personal dosimeters caused by access control systems for radiation facilities.
High frequency electromagnetic fields in the 120 kHz band emitted from card readers for access control systems in radiation control areas cause abnormally high and erroneous indicated dose readings on semiconductor-type electronic personal dosimeters (SEPDs). All SEPDs malfunctioned but recovered their normal performance by resetting after the exposure ceased. The minimum distances required to prevent electromagnetic interference varied from 5.0 to 38.0 cm. The electric and magnetic immunity levels ranged from 35.1 to 267.6 V m(-1) and from 1.0 to 16.6 A m(-1), respectively. Electromagnetic immunity levels of SEPDs should be strengthened from the standpoint of radiation protection.
Deji
Shizuhiko
S
Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Japan.
Ito
Shigeki
S
Ariga
Eiji
E
Mori
Kazuyuki
K
Hirota
Masahiro
M
Saze
Takuya
T
Nishizawa
Kunihide
K
D016477:Artifacts; D004867:Equipment Design; D004868:Equipment Failure; D019544:Equipment Failure Analysis; D006283:Health Physics / Q000295:instrumentation; D007221:Industry / Q000295:instrumentation; D016273:Occupational Exposure / Q000032:analysis*; D011827:Radiation; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods; D011874:Radiometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012637:Security Measures; D012666:Semiconductors; D012680:Sensitivity and Specificity