Extremity dosemeter 02-10.indd
The Personal Dosimetry Service of the Health Protection Agency provides extremity dosimetry based on alternative forms of themoluminescence dosemeter (TLD): the fi nger stall and the ring. The dosemeters are designed to measure doses from X-, beta and gamma radiations to the skin of the extremities (ie the hands and feet) in terms of the radiation quantity H (0.07),
the dose equivalent at a depth of 0.07 mm, as required by the Health and Safety Executive (HSE).
The dosemeters are issued as part of the HPA TLD dosimetry service, which is
approved by the HSE under Regulation 35 of the Ionising Radiations Regulations 1999.
The performance of the two types is very similar, with the fi nger stall being preferred
where low energy radiations are used. The dosemeter elements are produced
by Harshaw TLDTM, part of the Thermo Electron Corporation, and are individually
Finger stalls are available in two sizes,
radiation until they are heated (in this
is released as light. The amount of light
strip of KaptonTM foil containing a thin
released is proportional to the radiation
layer of sensitive lithium fl uoride powder
at one end. The sensitive area is covered
very thin and which allows very low energy
into an automated TLD reader which identifi es the dosemeter, heats it to the
adjustable format which will accommodate
fi nger diameters up to 29 mm. The dosemeter element is of the Harshaw
sensitive elements facing the predominant
direction of the radiation – in the case of
containing a thin layer of sensitive lithium
the fi nger stall, the aluminised side should
fl uoride powder. The element is covered
face the source, and, in the case of the
by a fl attened plastic dome with a thin
fi nger ring, the domed dosemeter housing
The extremity dosemeter service is just one of the approved dosimetry services offered by the Health Protection Agency and can be linked to our dose record keeping service via an automated system. The processing laboratory is based at our centre at Chilton. For further information or to place an order please contact us on the numbers below.
Centre for Radiation, Chemical and Environmental Hazards
Technical Specifi cation
The extremity dosemeters are subject to measurement
uncertainties which comply with the recommendations given in
Periods of 1, 2 or 3 months also available
Radiation Protection 160: Technical Recommendations for Monitoring
Energy dependence of response
Individuals Occupationally Exposed to External Radiation.
–25% to +15% for photon radiations from 16 keV to 1250 keV
and overall bias are typically 10% (allowed values: 15% and 20%
–10% to +20% for photon radiations from 20 keV to 1250 keV
exceptionally low beta energy detection threshold of 224 keV (E ).
The dosemeters may be worn in all normally encountered environments. In
ultraviolet light (including sunlight) should be avoided.
Angle dependence of response
Styles to suit allThe extremity dosemeter is available in
Within ±10% up to 90° for photon radiations and ±20% up to 60° for beta radiations
a wide range of styles to suit everyone. The fi nger stall is available in small and
Within ±25% up to 60° for photon radiations and ±45% up to
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