Enter the exposure rate constant (R-cm^2/hr*Ci), the source activity (Ci), and the distance (cm) into the Exposure Rate Calculator. The calculator will evaluate the Exposure Rate.
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Exposure Rate Formula
The following formula is used to calculate the Exposure Rate.
EX = R * a / r^2
- Where EX is the Exposure Rate (roentgen per hour)
- R is the exposure rate constant (R-cm^2/hr*Ci)
- a is the source activity (Ci)
- r is the distance (cm)
How to Calculate Exposure Rate?
The following two example problems outline the steps and information needed to calculate the Exposure Rate.
Example Problem #1
- First, determine the exposure rate constant (R-cm^2/hr*Ci).
- The exposure rate constant (R-cm^2/hr*Ci) is calculated to be : 12.838.
- Next, determine the source activity (Ci).
- The source activity (Ci) is measured to be: 5.
- Next, determine the distance (cm).
- The distance (cm) is found to be: 2.
- Finally, calculate the Exposure Rate using the formula above:
EX = R * a / r^2
The values provided above are inserted into the equation below and computed.
EX = 12.838 * 5 / 2^2 = 16.0475 (roentgen per hour)
Example Problem #2
The variables required for this problem are provided below:
exposure rate constant (R-cm^2/hr*Ci) = 6
source activity (Ci) = 7
distance (cm) = 8
Test your knowledge using the equation and check your answer with the calculator.
EX = R * a / r^2 = (roentgen per hour)
