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What are Radiological survey instruments:?

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There are many different types of radiation survey instruments, depending on the type of radiation being surveyed. Some common types of radiation survey instruments include gamma ray detectors, neutron detectors, and x-ray detectors.

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Im not sure I understand your questionThe question is not really clear but I will briefly write about radiological survey instruments..maybe that will help.

Radiological survey instruments are used to determine exposure rates,infact it is the most effective method for determining exposure rates.

The radiological survey instrument consist of various parts.It has a chamber in which nuclear radiation us detected,yielding an electric pulse or current,and electronic circuitry which converts the current into a meaningful readout.   
Most survey instruments are portable, and fairly easy to maintain in operational condition .Most survey instruments maintained  for emergency management are powered by standard Dcell batteries.That is why they are portable and fairly easy to maintain.

If you want to determine exposure rate with a survey instruments follow the operational instruction for that instrument.The procedure varies for different detectors
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Radiological survey instruments:

1. Radon sensor - This instrument senses the presence of radiation in a place by collectingogan terms of measurementradon, depth, and time.

2. Geassium sensor - This instrument senses the presence of potassium ions in a place by collectingogan terms of measurementgse and time.

3. Caesium sensor - This instrument senses the presence of cesium in a place by collectingogan terms of measurementce and time.
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Similar to the way a radio converts radio waves to sound, a radiological survey instrument converts radiation energy to a meter reading. In a radiological survey instrument, ionizing radiation interacts with material in the detector to produce ions.
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