Calculation of air-kerma rate of diagnostic X-ray generators.
As one type of basic physical data related to the calculation of the construction of X-ray examination room shielding, we investigated the air-kerma rate 1 m from the source of the useful beam focus per unit current time product. Compared to the X-ray energy penetration values obtained in prior research, we obtained higher values. We found three causes for this discrepancy: (1) the X-ray tube total filtration (increasing total filtration reduces air kerma), (2) the tube voltage ripple percentage (increased voltage ripple reduces air kerma, and (3) the target angle (increasing the target angle increases the air kerma). On standardizing (1)-(3), we confirmed that our values mostly matched those obtained in past research. Consequently, when one employs the air-kerma rate that results from the consideration of (1)-(3), without pursuing a path of excessive safety, calculation of shielding under clinical conditions is possible.
Katoh
Yoh
Y
Tokyo Metropolitan University, 7-2-10 Higashi-Ogu, Arakawa-ku, Tokyo, 116-8551, Japan. katoh@hs.tmu.ac.jp
Mita
Sogo
S
Fukushi
Masahiro
M
Nyui
Yoshiyuki
Y
Abe
Shinji
S
Kimura
Junichi
J
D000388:Air; D004560:Electricity; D011859:Radiography / Q000295:instrumentation*; D014965:X-Rays
Med Phys. 1994 Sep;21(9):1499-507
7838062
Radiology. 1959 Jan;72(1):62-7
13624054
Radiology. 1971 Sep;100(3):653-61
5567328
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2009 Mar 20;65(3):323-31
19367066
Radiology. 1972 Jul;104(1):161-9
5033580
AJR Am J Roentgenol. 1987 Sep;149(3):631-7
3497556