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CaF2 :Dy and CaF2 crystal-based UV dosimeters.

H C Wulf¹, M Gniadecka¹

¹Laboratory of Photobiology, Department of Dermatology, Bispebjerg Hospital, Copenhagen, Denmark.

Skin Research and Technology : Official Journal of International Society for Bioengineering and the Skin (ISBS) [And] International Society for Digital Imaging of Skin (ISDIS) [And] International Society for Skin Imaging (ISSI)

|June 22, 2016

Summary

Researchers developed personal ultraviolet (UV) dosimeters using thermoluminescent calcium fluoride (CaF2) crystals. These dosimeters effectively measure short-wave UVB and UVC radiation exposure, crucial for monitoring health risks associated with UV radiation.

Keywords:

CaF2 CaF2:Dy dosage dosimeters thermoluminescence ultraviolet radiation

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Area of Science:

Materials Science
Optics and Photonics
Environmental Health

Background:

Ultraviolet (UV) radiation exposure is linked to skin cancer, aging, and immunosuppression.
Accurate monitoring of UV exposure is essential for occupational and environmental health.
Developing reliable UV dosimeters is a key area of research.

Purpose of the Study:

To investigate the UV-dependent thermoluminescence of CaF2:Dy and CaF2 crystals.
To develop a small, personal UV dosimeter based on thermoluminescence.
To assess the feasibility of using these crystals for UV radiation monitoring.

Main Methods:

CaF2:Dy and CaF2 crystals were sensitized to UV by heating to 750-950°C on various supports.
Sensitized crystals were irradiated with UV radiation of different energies and wavelengths.
Thermoluminescence of irradiated crystals was measured at varying temperatures.

Main Results:

Optimal UV sensitivity was achieved after preheating crystals to 900°C on steel and manganese supports.
CaF2:Dy and CaF2 crystals demonstrated highest sensitivity to short-wave UVC and UVB radiation.
Personal UVB and UVC dosimeters were successfully constructed based on these findings.

Conclusions:

Personal UVC and UVB dosimeters utilizing UV-induced thermoluminescence in CaF2:Dy and CaF2 crystals are feasible.
These crystals are not sufficiently sensitive to long-wave UVA radiation for UVA dosimetry.
The developed dosimeters offer a promising tool for personal UV exposure assessment.