Table 1: The calculated parameters for gamma ray radiography system, with 20 cm thickness of the object and 1 cm source-focal spot size (all values for 1.691 MeV photons).

𝐿
(cm)
𝑎
(cm)
Spot size
(cm)
θ
(°)
𝑈 g
(cm)
𝑓 gamma *
(g cm−2 s−1)
Uncollided gamma*
(%)

75200304.29 1 . 0 0 𝐸 1 1 . 0 7 𝐸 + 7 99.24
80220354.54 9 . 0 9 𝐸 2 9 . 1 2 𝐸 + 6 99.24
85240404.76 8 . 3 3 𝐸 2 7 . 7 9 𝐸 + 6 99.25
90260454.94 7 . 6 9 𝐸 2 6 . 7 5 𝐸 + 6 99.25
95280505.1 7 . 1 4 𝐸 2 5 . 9 0 𝐸 + 6 99.22
100300605.71 6 . 6 7 𝐸 2 5 . 3 4 𝐸 + 6 99.27

*1.691 MeV.