Enter the original distance (ft), the original dose rate, and the required does rate into the Radiation Distance Calculator. The calculator will evaluate and display the Radiation Distance.

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## Radiation Distance Formula

The following formula is used to calculate the Radiation Distance.

**Drad = SQRT( D1^2*R1/R2)**

- Where Drad is the Radiation Distance (ft)
- D1 is the original distance (ft)
- R1 is the original dose rate
- R2 is the required does rate

## How to Calculate Radiation Distance?

The following example problems outline how to calculate Radiation Distance.

**Example Problem #1**

- First, determine the original distance (ft).
- The original distance (ft) is calculated to be : 50.

- Next, determine the original dose rate.
- The original dose rate is measured to be: 6.

- Next, determine the required does rate.
- The required does rate is found to be: 2.

- Finally, calculate the Radiation Distance using the formula above:

Drad = SQRT( D1^2*R1/R2)

The values given above are inserted into the equation below and the solution is calculated:

Drad = sqrt( 50^2*6/2) = 86.602 (ft)

**Example Problem #2**

The variables needed for this problem are provided below:

original distance (ft) = 100

original dose rate = 7

required does rate = 4

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer.

Drad = SQRT( D1^2*R1/R2) =** **(ft)