Megavoltage X-Ray Imaging Based on Cerenkov Effect: A New Application of Optical Fibres to Radiation Therapy

Table 1

X-ray fluence-to-mean-dose conversion factors for mono-energetic broad parallel beams incident on 18.67, 36.30, and 53.01 cm thick water slabs in air in units of Gy/(X-ray/cm²). Statistical uncertainties for each X-ray energy are 1.2%, 1.3%, and 1.3% for the 18.67, 36.30, and 53.01 cm thick water slabs, respectively.

𝐸𝛾/MeV	𝑑^′=18.67 cm	𝑑^′=36.30 cm	𝑑^′=53.01 cm
0.2	9.43×10^−13	6.54×10^−13	4.72×10^−13
0.3	1.43×10^−12	1.02×10^−12	7.45×10^−13
0.4	1.90×10^−12	1.38×10^−12	1.02×10^−12
0.5	2.35×10^−12	1.73×10^−12	1.30×10^−12
0.6	2.78×10^−12	2.08×10^−12	1.58×10^−12
0.8	3.59×10^−12	2.74×10^−12	2.12×10^−12
1	4.32×10^−12	3.36×10^−12	2.64×10^−12
1.25	5.15×10^−12	4.08×10^−12	3.26×10^−12
1.5	5.91×10^−12	4.76×10^−12	3.85×10^−12
2	7.25×10^−12	5.99×10^−12	4.95×10^−12
3	9.54×10^−12	8.13×10^−12	6.91×10^−12
4	1.15×10^−11	1.00×10^−11	8.68×10^−12
5	1.33×10^−11	1.18×10^−11	1.03×10^−11
6	1.50×10^−11	1.34×10^−11	1.19×10^−11
7	1.66×10^−11	1.50×10^−11	1.34×10^−11
8	1.82×10^−11	1.66×10^−11	1.49×10^−11
10	2.12×10^−11	1.96×10^−11	1.78×10^−11
15	2.82×10^−11	2.70×10^−11	2.48×10^−11
20	3.47×10^−11	3.41×10^−11	3.17×10^−11