Table 1: Details of irradiation settings for X-ray tube Goliath Titan Isovolt 160E. Mean distance to irradiation source was 39 cm. Irradiation time was calculated on the basis of the irradiation intensity of the X-ray tube for 90kV at 39 cm distance, which was 2.97 Gy/min at 19mA and 5.198 Gy/min at 33.7 mA.

Irradiation dose (Gy)

Voltage (kV)

Amperage (mA)

Time (s)

Filtration

20.0

90

33.7

434 s

aluminium sheet, 1mm thick

5.0

90

33.7

109 s

2.0

90

33.7

43 s

0.5

90

19.0

19 s