Table 5.

Effect of cadmium foil on the dose measured by TLD‐100 at 18 MV

Measurement location		Dose (μGy/MU)
Distance a (cm)	Depth b (cm)	TLD‐700	TLD‐100
			No Cd	0.25‐mm Cd	0.5‐mm Cd	0.75‐mm Cd
17	3.75	172.3	327.8	206.4	202.9	201.3
17	11.25	134.2	216.1	163.1	165.0	158.5
51.6	3.75	10.1	96.5	18.7	16.9	16.9
51.6	11.25	7.7	57.0	12.0	12.0	11.9

^a Distance from the central axis.

^b Depth from phantom surface.