Radiation dosimetry using decreasing TL intensity in a few variety of silicate crystals

Shigueo Watanabe; Nilo F Cano; T K Gundu Rao; Letícia M Oliveira; Lucas S Carmo; Jose F D Chubaci

doi:10.1016/j.apradiso.2015.07.056

Radiation dosimetry using decreasing TL intensity in a few variety of silicate crystals

Appl Radiat Isot. 2015 Nov:105:119-122. doi: 10.1016/j.apradiso.2015.07.056. Epub 2015 Jul 31.

Authors

Shigueo Watanabe¹, Nilo F Cano², T K Gundu Rao¹, Letícia M Oliveira¹, Lucas S Carmo¹, Jose F D Chubaci¹

Affiliations

¹ Instituto de Física, Universidade de São Paulo, São Paulo, SP, Brazil.
² Departamento de Ciências do Mar, Universidade Federal de São Paulo, Campus Baixada Santista, Santos, SP, Brazil. Electronic address: nilo.cano@unifesp.br.

PMID: 26277189
DOI: 10.1016/j.apradiso.2015.07.056

Abstract

This study shows that there are some ionic crystals which after irradiation with high gamma dose Dm and subsequent irradiation with low doses ranging up to 500Gy present a decreasing TL intensity as dose increases. This interesting feature can be used as a calibration curve in radiation dosimetry. Such behavior can be found in green quartz, three varieties of beryl and pink tourmaline. In all these silicate crystals it can be shown that irradiation with increasing γ-dose there is a dose Dm for which the TL intensity is maximum. Of course, Dm varies depending on the crystal and irradiated crystal with the dose Dm is stable. If one of these crystals is taken and irradiated with doses from low values up to 400-500Gy, a curve of decreasing TL intensity is obtained; such a curve can be used as a calibration curve.

Keywords: EPR; Radiation dosimetry; Silicate; TL.