AN/PDQ-1 measurement range is

• A. 0 to 100 R/h
• B. Background to 1000 R/h
• C. Background to 500 R/h
• D. Background to 1000 R/h

Answer: (D)

The main idea is what dose rates the instrument can reliably display. The AN/PDQ-1 is designed to show readings starting from the natural ambient background radiation and up to a maximum of 1000 roentgens per hour. This means it can detect very low, background levels and still provide meaningful measurements as the radiation level rises, up to its upper limit.

This range is important because you often need to know if an area is just at normal background or if there's a significant source increasing the dose rate. If readings approach the maximum, it signals a potential hazard that requires immediate attention or a switch to a higher-range instrument.