Calculate the PDD of Depth (D)if the Dose at Dmax

question 37

Multiple Choice

Calculate the PDD of depth (d) if the dose at Dmax is 250 cGy and the dose at d is 231 cGy.

• A) 70%
• B) 75%
• C) 85.2%
• D) 92.4%

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Definitions:

Cash Payback Period

The duration of time it takes for an investment to generate enough cash flow to recover its initial cost.

Net Income

The total earnings of a company after all expenses and taxes have been deducted from revenues, indicating profitability.

Straight-Line Rate

A method of calculating depreciation by dividing the difference between an asset's cost and its salvage value by the number of years it is expected to be used.

Annual Rate

The interest rate or growth rate over a period of one year, used for comparing investment returns or loan costs.