Actas de congresos
White and green jadeite characterization by thermoluminescence.
Fecha
2013-09-29Registro en:
Encontro da SBPMat, XII, 2013, Campos do Jordão.
Autor
Barbosa, Renata de Faria
Guttler, Rainer Aloys Schultz
Reichman, Fernando
Rocca, René Rojas
Mamani, Nilo Francisco Cano
Watanabe, Shigueo
Institución
Resumen
Except for gemologically or industrially important silicate minerals, a large number of
other natural silicate minerals have been investigated only concerning
geological/mineralogical aspects. Jadeite is a silicate mineral with chemical formula
NaAlSi2O6 belongs to the Piroxene group. Two kind of this mineral were used in this work
to be investigated as to radiation effect on their Thermoluminescence properties; also to
study the possibility of them to be used in high dose dosimetry. These samples, one white
(WJ) and other one green colored (GJ), have been obtained from China. As usual, they
were pulverized and sieved to retain grains sizes between 0.080 and 0.180 mm for TL
measurements. A 60Co source was used for gamma-irradiation at IPEN – Institute for
Nuclear and Energy Researches, SP, Brazil. Furthermore, for high doses gammairradiation,
it was used a Nordion JS 9600 (dose rate of 30 kGy/h) at CBE/EMBRARAD,
Cotia, SP, Brazil. The powder was divided into portions and irradiated in the range of dose
varying 0.05 to 3000 kGy. Moreover, the TL measurements have been carried out on
Harshaw model 4500 TL reader (temperature range: 50 °C up to 400 °C and heating rate:
4 °C.s-1)