A radiation field often consists of multiple types of radiation(portable ultrasound machine). Instruments usually must have the capability to detect particular types of radiation and produce relative or absolute measures of their magnitudes, while discriminating against other types of radiation.
Individuals choosing radiation protection instruments for measurements preferably should know about the radiation environment under investigation. Is it predominantly photon radiation, charged particle radiation, neutron radiation, or mixtures thereof? Spectroscopy measurements can determine the types and energy distributions, but often measurements require simpler detection or measurement devices.
The radiation environment may be characterized by the maximum energy of radiation, whether the radiation source is continuous, as with an X-ray unit, rapidly pulsed as with some linear accelerators, or is random decay from a radioisotope. Is the measurement made in the primary direct beam, or in scattered radiation beam filtered by radiation barriers? Choice of instruments depends on why the radiation is being measured.
It is desirable to know the approximate magnitude of radiation, expressed in some appropriate units, and the approximate energy of the radiation. It is then possible to estimate personnel equivalent dose rates in the radiation field. Multiple instruments(cheap ultrasound machine) with different features may be required to properly characterize and measure a radiation environment.
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