Today is a modern period with very new inventions and the advent of new technologies, many new imaging techniques are developed for diagnostic and therapeutic purposes. Many of this imaging equipment contain radiations that may be injurious not only for the patient but also for the radiation workers when it exceeds the safe range. So detection, measurement and proper monitoring of radiation intensity are extremely important in Imaging world.
Optically Stimulated Dosimeter
It is one of the latest personal monitoring devices which was developed in the late 1990s by Landauer. It is used for both personal and patient radiation monitoring and uses aluminium oxide for the detection of radiations. It is more sensitive and precise as compared to ThermoluminescenceDosimetry devices and has many advantages over all other radiation detecting devices. It has a wide range and extraordinary long term stability. Reanalysis for dose conformation and qualitative information regarding exposure conditions are possible with this type of instrument.
This is an accurate and sensitive device for personal radiation detection and for patient dose measurement during various therapeutic and diagnostic radiological procedures. The sensitive material used in it is lithium Florida. It has many advantages over film badges having more accurate and sensitivity towards radiations.
Properly calibrated ThermoluminescenceDosimetry devices can detect exposure as low as 5mR and there is no loss of information after exposure to excessive humidity or heat as in case of film badges, but the disadvantage of this type of device is its cost which is twice expensive than film badge device.
These are used widely in radiological sciences, it is used in detector arrays of most computed tomography imaging system and is the basis for gamma camera in nuclear medicine.
These are sensitive devices for gamma radiation and x rays and are eligible for measuring very low-intensity radiation like single-photon interaction and are more sensitive then Geiger Muller Counter, having higher detection efficiency and therefore would be used for monitoring contamination and low level of radiations.
Geiger Muller Counter
Radiation detection and radiation measuring device that detects individual ionization. These are used for controlling contamination in nuclear medicine laboratories and it is also used as a portable survey device that is able to detect the presence of radioactive leakage and contamination in laboratories and work surfaces. They are difficult to calibrate and have not a wide range of detection.
It is also a type of gas-filled detectors and is sensitive instruments which are used at stationary lab instruments for detection of small quantities of radioactivity. This device is used often to detect alpha and beta radiations and have the ability to distinguish these two. This device has very little applications in clinical radiology.