Thallium bromide is a semiconductor compound with high atomic number and density. It has a CsCl-type simple cubic crystal structure and it is non-hygroscopics. The TlBr crystals are relatively soft with a knoop hardness number of 12. In this work, the TlBr commercial powder was purified by zone refining and the purest material section was used for crystal growth by Bridgman method. Efforts have been concentrated on the purification of the TlBr. The purification efficiency has been evaluated (NAA and ICP-MS) by impurities reduction results after zone refining passes. The crystalline quality was evaluated by X-ray diffraction. The characterized TlBr crystal as a detector has shown good response to gamma radiation.

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Instrumental neutron activation analysis (INAA) was applied to estimate the concentrations of Ca, Co, Cr, Cu, Fe, K, Mg, Mo, Mn, Na, Se and Zn in hair samples from Holstein-Friesan male calves, which were infested with Boophilus microplus larvae and, also from healthy animals. These results were obtained in order to evaluate if is there a significant difference between the trace element concentrations in hair samples from infested and healthy animals.

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