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91
ST 1.2 –
Dosimetría externa
RADIATION DOSIMETRY USING
DECREASING TL INTENSITY VS RADIATION DOSE
Carmo, Lucas S; Watanabe, Shigueo; Rao, T.K. Gundu;
Oliveira, Leticia M.; Cano, N.F; Rocca, Rene Rojas
Instituto de Fisica da Universidade de São Paulo. Brasil
* Responsible author, email: etoledo@dfn.if.usp.br
The Thermoluminescent Dosimetry (TLD) started in mid-20th century using ionic crystals. It
started with LiF crystal
doped with Mg and Ti, but several other crystals have been tried, some
of them with success being used in practice. Radiation Dosimetry is very important for Radiation
Protection. In abstract-I in this meeting we have shown that the increasing TL or EPR intensity
as function of dose is used in dosimetry and usually this function either saturate or has a
maximum at a dose Dm. Dm varied from crystal to crystal. It was then shown here that a silicate
mineral irradiated with dose Dm is very stable and if it is irradiated with dose from low value up
to 400-500 Gy its TL intensity decreases in many cases exponentially. This exponential curve is
essentially a calibration curve, therefore the decreasing TL intensity can be used for Radiation
Dosimetry. This fact is shown using quartz, beryl and tourmaline.