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Ratio of the dose rate measured at different dwell positions over the treatment to the calculated dose rate from the planning system. The plastic scintillation detector was inserted in the urethra aligned to dwell position #9 and only positions with dwell times over 5 s were selected (total of 43 positions). Uncertainty on measurements was obtained using the standard deviation from ten consecutive data points (1 s span) for the same dwell position.
