Angular dependence of the TL reading of thin α-A2O3: C dosemeters exposed to different beta spectra

Pietro Mancosu, Dario Ripamonti, Ivan Veronese, Marie Claire Cantone, Augusto Giussani, Giampiero Tosi

Research output: Contribution to journalArticlepeer-review


The angular dependence of the thermoluminescent (TL) signal of thin α-Al2O3:C dosemeters was investigated for a series of beta-emitting radionuclides commonly employed in nuclear medicine and characterised by different mean energies (99Tc, 177Lu, 90Sr/90Y and 90Y). Irradiations were performed in a controlled geometry, using a properly designed irradiator intended to realistically reproduce the situation of exposure of hospital personnel to beta-emitting pharmaceuticals. Under the conditions of extended source and short source to detector distance, the TL signal of thin α-Al2O3:C layers per unit irradiation time was observed to be independent on the angle of incidence within acceptable limits, particularly for those radionuclides with maximum energy >500 keV. This property may be easily explained by using simple physical considerations, such as the limited thickness of the dosemeters. The results confirm that these detectors are suitable for beta-ray extremity dose measurements, when the photon contribution is negligible, as in the case considered.

Original languageEnglish
Pages (from-to)359-365
Number of pages7
JournalRadiation Protection Dosimetry
Issue number4
Publication statusPublished - 2005

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology
  • Nuclear Energy and Engineering
  • Radiation


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