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The OSL stands for optically stimulated luminescence.

Components: The OSL dosimeter contains an aluminum oxide detector with three filters, one of aluminum, one of copper, and one of tin. The different metals of the filters are meant to block different levels of energy. Which is how the exposure is determined.

Sensitivity Range: The OSL can read as low as 10 micro Sv and up to 10 Sv.

Wear Time: OSL's are usually worn anywhere between 1-3 months. However, they can be worn for up to 1 year before being read.

Method of Readout: A laser light is used to determine the amount of exposure through the measure of brightness.

Advantages:

OSL's can be worn for up to a year

They are lightweight and durable

Can be reanalyzed after the initial reading

They are tamper proof to prevent them from being opened or affecting the reading

They will not be affected by heat, temperature or pressure

Work well for readings of those in low radiation workplaces

Disadvantages:

May take time to receive results as they will have to be sent to a different facility where they are read

It will only measure the exposure to the body part it is worn on top of

Can produce inaccurate readings if it is left in an exam room or elsewhere where it could receive exposure.

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Optically stimulated luminescent dosimeter | Radiology Reference Article | Radiopaedia.org

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Optically stimulated luminescent dosimeters (OSL) are passive radiation detection devices used for personal dose monitoring. Unlike thermoluminescent dosimeter (TLD). OSL does not need heating for the reading of radiation dose. OSL dosimeters ca…

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The TLD stands for thermoluminescent dosimeter.

Components:

It is made of lithium fluoride crystals, encased within a radiolucent packaging.

Sensitivity range:

Can absorb up to 5 mR

Wear Time: TLD's can only be worn for up to three months.

Method of Readout:

The crystals absorb energy from exposures. To be read out the crystals are heated and emit light, the intensity of the light emitted is proportional to the dose the person wearing it received.

Advantages:

The crystal's reaction to the radiation is similar to the way that human tissue does, allowing for a more accurate readout.

Not affected by humidity temperature, or pressure.

Can be made into rings; as seen in nuclear medicine, which can be beneficial to giving an accurate read out when working with radioactive materials with your hands.

They are reuseable and cost effective after the initial purchase.

Disadvantages:

They can be expensive for the initial purchase.

They can only be heated and read out once, so the first reading must be recorded, or the information is lost.

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Components:

The personal digital ionization chamber is made of a direct ion storage technology also known as a DIS, as well as a digital display screen.

Sensitivity Range:

Can detect as low as .001 mSv up to 10 sV

Wear Time:

Personal digital ionization chambers can be worn for up to 3 months or up to a year.

Method of Readout:

A laser light is used similarly to an OSL to measure light in proportion to exposure.

Advantages:

Compact sized device allows it to be carried on the person easily

Unnecessary for the dosimeter to be turned in to be read.

Reading results are immediate and can be seen by the person through the digital display screen

This device also can track whether or not it is being worn or if the readings are successful

Disadvantages:

Must contain a charge to collect readings and analyze, requires either batteries, or able to hold a charge from being plugged in for a set amount of time

More expensive compared to the OSL or TLD dosimeters

Not as durable as the OSL or TLD dosimeters and can be easily broken which would affect readings.

Readings must be taken daily

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Components: The pocket ionization chamber is similarly shaped as a pen and can be worn in the pocket of the individual. It contains a thimble ionization chamber, and two electrodes a negative on the outside and positive on the inside. Self-reading ones will also contain a built-in electrometer. A fiber indicator is also inside for readout purposes.

Sensitivity Range:

They can measure up to 200 mR.

Wear time: They can be worn up to a year but are most commonly worn for 1-3 months.

Method of Readout:

After exposure to ionizing radiation, the air around the central portion of the electrode is ionized. In result the electrode is discharged in a proportional ratio to the amount of radiation it is exposed to. A fiber indicator in the unit will move due to this to show the amount of exposure in mR.

Advantages:

Compact size allows it to be carried on the person easily.

Most sensitive dosimeter allowing it to be more accurate in its readings

Has immediate readings

It can detect high levels of radiation exposure

Disadvantages:

Must contain a charge to collect readings and analyze

More expensive compared to OSL or TLD dosimeters

Readings must be taken daily

Not as durable as other dosimeters, if dropped the fiber indicator could be displaced leading to inaccurate readings.

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Ionization Chamber Meter (Cutie Pie)

Components:

These are made of a gas filled radiation chamber, a protective casing, and electrometer circuit used for readout.

Sensitivity Range:

Depending on the mode used, different amounts of radiation can be detected. In rate mode it will measure 1 mR/hour up to several thousand per hour.

In integrate mode it can measure .1 mR up to 1 R.

Wear time:

These devices can be used for up to one month

Method of readout:

This is read similarly to the pocket ionization chamber, where there is two electrodes, negative on the outside and positive on the inside. When exposed to ionizing radiation, the air is ionized and moves a proportional indicator the amount it is exposed to.

Advantages:

Monitors larger areas exposed to radiation

Can pick up scatter radiation

Can measure radioisotope exposure rates within their storages

Additionally they can be used for patients who are using radioactive materials for therapeutic purposes

Disadvantages:

They can easily be broken

Large in size, not ideal for portable continued carrying

Requires time to warm up before use

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Proportional Counter

Components: The proportional counters are also built with a gas chamber similar to the Cutie pie and the pocket ionization chamber. It has a gas chamber, an electrometer circuit for readout, and a protective casing.

Sensitivity Range: No information in my research listed a number of radiations it was able to detect, however this device has the unique ability to distinguish the amounts between alpha and beta and gamma radiation exposures.

Wear time: No information was found on this; however, this device is not worn and not used in diagnostic imaging. It is most commonly used in laboratory settings.

Method of Readout: Readout depends on the levels of air ionized in the chamber; they use spectroscopy to determine how much of which radiation was exposing the dosimeter.

Advantages:

highly sensitive to very low levels of radiation

can detect different types of radiation and the amounts of each that were exposed

Very accurate

Disadvantages:

not useful to diagnostic imaging, used in a laboratory setting