A tumour is treated with a Co-60 unit. TAR for the position and the field is determined to be 0.80. What is the administered dose of radiation if the treatment lasts 92 seconds? The machine's in-air dose rate at the isocentre is 1.50 Gy/min.

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Quizplus · Accepted Answer

The administered dose of radiation can be calculated using the formula: Dose = (Dose Rate in-air) × (Time in minutes) × (TAR). Given the in-air dose rate is 1.50 Gy/min and the treatment time is 92 seconds (which is 92/60 = 1.53 minutes), and the TAR is 0.80, the calculation is as follows: Dose = 1.50 Gy/min × 1.53 min × 0.80 = 1.83 Gy, which rounds to 1.8 Gy.

A Tumour Is Treated with a Co-60 Unit