A new system of radiation dose mapping based on laser heating of thermoluminescent dosimetric plates (TLDP) has been developed. Application of this technique to intraoperative radiotherapy (IORT) has been investigated. Preliminary results show that TLDP are a possible alternative to radiological films and ionization chambers since they provide some advantages such as 2D dose measurements with digital storage, large dynamic dose range, and easy processing.

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The spatial dose distribution originating from a "hot particle", a small radioactive sphere of 60 Co, has been measured using laser heated thermoluminescence (TL) or the OSL technique (optical stimulated luminescence). Advantage and limitation of both techniques are discussed. A maximum dose rate of 79 Gy/h is measured in the centre of the TLD plate (CaS0 4 :Dy deposited on a kapton support).