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Random Error and Minimum Dose Requirement
The margin for random decreases with decreasing prescription isodose line /
minimum dose requirement
95%
50%
73%
M =
β√(σ
2
+σ
p
2
) − βσ
p
Prescription level
β
95%
1.64
80%
0.84
70%
0.52
60%
0.25