A dosimeter is an instrument used to measure exposure to ionizing radiation, such as alpha or beta particles, neutrons, gamma rays, or X-rays. It is an essential tool for people working in situations where they are exposed to radiation. Pocket dosimeters are used to provide the user with an immediate reading of their exposure to x-rays and gamma rays. As the name implies, they are commonly used in the pocket. The two types commonly used in industrial radiography are the direct-read pocket dosimeter and the digital electronic dosimeter.
A quartz fiber dosimeter, sometimes called a self-indicating pocket dosimeter (SIPD) or self-reading pocket dosimeter (SRPD) or quartz fiber electrometer (QFE), is a type of radiation dosimeter, a pen-like device that measures the cumulative dose of ionizing radiation received by the device, usually in a work period. An electronic personal dosimeter is a modern dosimeter that can provide a continuous reading of the cumulative dose and the current dose rate and warn the wearer when a specified dose rate or cumulative dose is exceeded. A personal dosimeter is a dosimeter that the person being monitored wears on the surface of the body and records the radiation dose received. Releasing the dosimeter disconnects the charger pin from the ion chamber, but induces a small change in zero, which is relatively unpredictable. The DIS dosimeter is based on the combination of an ion chamber and a non-volatile electronic charge storage element. Dosimeters usually record a dose, the absorbed radiation energy measured in gray (Gy), or the equivalent dose measured in sieverts (Sv).
A thermoluminescent dosimeter, abbreviated as TLD, is a passive radiation dosimeter that measures exposure to ionizing radiation by measuring the intensity of visible light emitted by a sensitive crystal in the detector when the glass is heated. As the dosimeter is exposed to radiation, ionization occurs in the surrounding chamber, decreasing the charge on the electrode in proportion to the exposure. In radiation therapy dosimetry, MOSFET dosimeters often replace TLD dosimeters because they offer an immediate reading. The main objective of this project is to help people learn interesting and important information about ionizing radiation and dosimeters. As with other types of personal radiation dosimeters, it is used by workers who are exposed to radiation at work, so their employers can keep a record of their exposure to verify that it is below the limits prescribed by law.
Typical industrial x-ray pocket dosimeters have a full scale reading of 200 milliroentgens, but there are designs that will record higher quantities. The direct ion storage dosimeter, DIS, is an electronic dosimeter from which dose information for Hp (and Hp (0.0) can be obtained instantly at the workplace using an electronic reading unit.
