[1] RT Calculator Isotope, http://www.ok-s.com/software_en/ndtrt/ndtrt.php, Accessed 10.08.16
[2] Radiography Calculation (ATTAR), www.attar.com.au/uploadimage/Product/ProductImg/ radiography_calculations.xls, Accessed 15.12.16
[3] RTcalc, https://play.google.com/store/apps/ details?id=jp.ne.asahinet.mr2yknst.rtcalc&hl=en, Accessed 12.01.17
[4] ISO 5579, (2013). Non-destructive testing -- Radiographic testing of metallic materials using film and X- or gamma rays - Basic rules.
[5] ASME, Sec IV, Article 2, (2013). Radiographic Testing.
[6] IAEA Training course series No. 3, (1992). Industrial Radiography.
[7] ASNT Nondestructive Testing Handbook, Third Edition: Volume 4, (2002) Radiographic Testing (RT)
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