What is a Survey meter?

It is a portable and simple radiation measuring instrument that is affected by radiation in an environment that is not subject to inspection. Normally, μSv / h, count number (cpm), and surface contamination (Bq / m2) are measured. The type of radiation emitted depends on the type of radioactive material. There are measuring instruments by radiation such as alpha (α) rays, beta (β) rays, gamma (γ) rays, and neutron rays. The types of detectors include ionization chamber type, GM tube type, scintillation type, neutron, GM tube type and scintillation type for surface contamination inspection. It is necessary to select a measuring device according to each purpose, such as measurement of the type and amount of radioactive material, measurement of external exposure dose, and measurement of individual dose.

Application of Survey meter

It is installed as a monitoring post around nuclear facilities and in each prefecture. The air dose is measured outdoors or in a room, and the target is gamma rays. Since the scintillation type and the sensitivity are high, it is suitable for measurement in places with low radiation values. The ionization chamber type survey meter is suitable for detecting high radiation doses. It is legally required for workers engaged in radiation work to measure the exposure dose in order to grasp the exposure dose, and personal dosimeters are mainly used. Beta rays are measured to measure the surface of an object, and a GM counter tube type survey meter is often used, but if it is not available, a scintillator type simple measuring instrument can be used instead. The standard value indicating the degree of radioactive contamination contained in food is small, and it is difficult to measure with the above survey meter that measures the air dose in the environment. Use.

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