ASNT Industrial Radiography Radiation Safety Practice Test

How long will a radiographer take to receive a total dose of 50 mR (500 μSv) at a rate of 100 mR/h?

1. 15 minutes

2. 30 minutes

3. 1 hour

4. 45 minutes

The correct answer is: 30 minutes

To determine how long it will take a radiographer to receive a total dose of 50 mR at a rate of 100 mR/h, it's essential to understand the relationship between the dose rate and the time it takes to accumulate a specific dose. The dose rate is given as 100 mR/h, which means that for every hour of exposure, the radiographer will receive 100 mR. To find the time required to receive 50 mR, you can set up a proportion based on the dose rate: 1. **Understand the dose rate**: At 100 mR/h, if we consider a full hour, the radiographer receives 100 mR. 2. **Calculate the time for 50 mR**: To find out how long it will take to receive 50 mR, we can use the following formula: \[ \text{Time (hours)} = \frac{\text{Total Dose (mR)}}{\text{Dose Rate (mR/h)}} \] Inserting the values: \[ \text{Time (hours)} = \frac{50 \text{ mR}}{100 \text{ mR/h}} =