If the prescribed dose for an intra-cavitary application is 7,500 cGy and the point A dose rate is 50 cGy/hr, what is the treatment time in hours?

To find the treatment time in hours for an intra-cavitary application with a prescribed dose of 7,500 cGy and a dose rate at point A of 50 cGy/hr, you can use the formula:

Treatment Time (hours) = Prescribed Dose (cGy) / Dose Rate (cGy/hr).

Substituting the given values:

Treatment Time = 7,500 cGy / 50 cGy/hr = 150 hours.

This calculation provides the needed duration to administer the total prescribed dose at the specified rate, highlighting that for every hour of treatment, 50 cGy is delivered. Therefore, to achieve the total dose of 7,500 cGy, the total treatment time must be 150 hours. This understanding is crucial in medical dosimetry to ensure proper dose delivery and patient safety.