ASNT Industrial Radiography Radiation Safety Practice Test

What is the current dose rate at a position where a radiographer reads 7.5 on the lOx scale of the survey meter?

1. 7.5 mR/h

2. 75 mR/h

3. 750 mR/h

4. 0.75 mR/h

The correct answer is: 75 mR/h

The answer of 75 mR/h is correct because survey meters used in industrial radiography often have a specific scaling system that allows for conversion into actual dose rates based on the readings. In this case, the survey meter's reading of 7.5 on the lOx scale means that the value should be multiplied by a factor associated with that scale. In many survey meters, reading "lOx" typically suggests that the meter is set to a scale that requires you to multiply the number displayed by a factor of ten. Therefore, a reading of 7.5 on the lOx scale translates to 7.5 multiplied by 10, resulting in a current dose rate of 75 mR/h. Understanding how to interpret different scales on survey meters is crucial for ensuring safety and making accurate measurements in radiographic environments. This highlights the importance of being familiar with the equipment used in radiation safety practices.