Liu Shu-lin, Zhang Li-min, Wang Ling-zhen, 等. Absolute determination of exposure for 60—250 kilovolt X-rays[J]. Nuclear Techniques, 1981,04(1):31-37.DOI:
or Röentgen were measured by a parallel—plate free air ionization chamber. The plate distance was 20.9cm. The length of collector was 10cm. The correction factors were determined. The uncertainty of measurement was about 1.8% for 60~250kV X-rays. The long-term standard deviation was ±0.1%.
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references
ICRU 第19号报告,辐射量和单位 , 原子能出版社 , 1974 年.
H. O. Wyckoff and F. H. Attix , NBS Handbook , 64 ( 1957 ).
M. T. Niatel , phys. Med. Biol. , 12 , 4 , 555 ( 1967 ).