Whole-body dosimetry

OSL - The dosimeter of the future

The OSL dosimetry (Optically Stimulated Luminescence) is a method that has established itself in the whole-body dosimetry, and it represents a breakthrough in the measurement of the personal dose equivalent Hp(10). It is ideal for the evaluation and surveillance of the personal dose by photon radiation. With the measuring method by means of the optical stimulated luminescence, an energy range of 16 keV to 7 MeV can be covered.

Short description

The OSL dosimeter supplied by us consist of a light-tight dosimeter sheath of which the upper shell and the lower shell are ultrasonically welded, the detector card being located in the middle of the two shells. Two detectors based on beryllium oxide ceramic are attached to the detector card. Due to their positive dosimetric property to record radiation of different energy in all tissues with only small deviations (linearity over a wide energy range and tissue equivalence), the beryllium oxide detectors are particularly suitable for the whole-body dosimetry.

In order to avoid dose manipulations and contamination by dust and water, all OSL dosimeters are supplied in a blister package. We would like to point out that in case of damage of the blister package no official dose value can be determined.

The OSL dosimeter is attached to a belt clip. In addition, a cassette in several colors is also available for selection. Our OSL dosimeter is an official personal dosimeter approved by virtue of its construction by the Physikalisch-Technische Bundesanstalt (PTB).

Assembling of an OSL dosimeter

Source: Helmholtz Zentrum München, Michael Haggenmüller

Assembling of an OSL dosimeter

Source: Helmholtz Zentrum München, Michael Haggenmüller

Functioning and dose determination

The principle of optically stimulated luminescence (OSL) is similar to the principle of the thermally stimulated luminescence (TL). Energy in the form of ionizing radiation hits the BeO detector and is stored by lifting electrons to higher energy levels. In this process, electrons are caught in so-called electric traps until an excitation by light occurs again so that the electrons fall back to a lower energetic basic level. In this manner, the detector releases the stored energy in the form of light, i.e., it is stimulated to emit light. The light output measured with photomultipliers is a measure unit for the dose.

Unlike in the thermally stimulated luminescence, the excitation in the optically stimulated luminescence is achieved by light and not by heat. 

Wearing options

The OSL dosimeter should be worn on a part of the body most likely to receive exposure - usually on the trunk, in the chest area or hip area. If you use a lead apron, the dosimeter must be worn under the lead apron. 

Wearing options of the OSL dosimeter: in the trunk area, at chest level.

Source: Helmholtz Zentrum München, Michael Haggenmüller

Wearing options of the OSL dosimeter: in the trunk area, at chest level.

Source: Helmholtz Zentrum München, Michael Haggenmüller

Operating instructions

The OSL is issued by the monitoring service in a blister package for a certain wearing period (usually for one month or for a maximum of three months). The front side of the package is covered with a label on which the dosimeter ID, the operation number, the monitoring period and the provisional personal assignment are printed. This label is designed exclusively for your personal dosimeter datamanagement, you can overwrite the label and stick it on. However, the additional label may not overtop the front side of the package,  and it must be made of paper or chlorinated hydrocarbon polymers (e.g., polyethylene or polypropylene). The total thickness of the label and the optional carry bag must not exceed 0.2 mm.

The dosimeter must be positioned towards the expected radiation source in such a way that the radiation optimally reaches the probe level perpendicularly from the front, however, always maintaining an incidence angle of +60 to -60 degrees.  

The dosimeter is suitable for use at ambient temperatures of 10° C to +40° C and a relative humidity of 10% to 90%. It should not be exposed to direct sunlight radiation over 1000 W / m². If necessary, the blister packaging can be cleaned with a damp cloth.

Energy range and measuring range

Type of radiationMeasuring rangePhoton energy
Photon radiation0,1 mSv - 10 Sv16 keV - 7 MeV
OSL in a support frame with label

Source: Helmholtz Zentrum München, Michael Haggenmüller

OSL in a support frame with label

Source: Helmholtz Zentrum München, Michael Haggenmüller

Using OSL-dosimeters with DosiNet

The OSL dosimeters are offered only with the customer service software DosiNet and DosiCon. This allows users to change personal assignments online quickly and easily.

More information about DosiNet and DosiCon are available on our website AWST in the section Dosimetry Online. For further questions about our online services please call the hotline 089/3187 - 2020 or send us an . Your questions will be answered promptly.

More information can be found in our flyers which are available for download

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