A portable instrument, such as a Geiger counter or ionization chamber, used to detect nuclear radiation and to measure the dose rate See Monitoring
Any portable radiation detection instrument designed to determine the presence of radioactive materials and/or ionizing radiation fields Survey meters are of two types: Count rate meters that detect only the presence of radioactive material Under certain conditions the survey meter's reading may be used to determine the exposure rate from a source of radioactive material Dose rate meters that are used to evaluate the intensity of radiation fields in units such as rem per hour, millirem per hour or sievert per hour