Neutron-Activation Analysis Of Aluminum In Mg2sio4
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT(1994)
摘要
An investigation of the role of aluminum in the enhancement of the near infrared lasing properties of chromium doped forsterite (Cr:Mg2SiO4) has led to the development of a neutron activation analysis (NAA) procedure for the trace analysis of aluminum in a silicon-containing matrix. After the initial analysis of a set of standards, this method requires only one irradiation per sample and relies upon the inherent nuclear properties of the silicono isotopes Si-28 and Si-29.The Al-28 signal produced by the activation reaction Al-27(n, gamma)Al-28, is interfered by the competing fast neutron reaction Si-28(n, p)Al-28. Activation of an aluminum-free silicate will produce a constant ratio of Al-28 and Al-29 signals due to the Si-28(n, p)Al-28 and Si-29(n, p)Al-29 fast neutron reactions. Activation of an aluminum-doped sasmple will result in an increase in the Al-28 signal due to the Al-27(n, gamma)Al-28 thermal neutron reaction but have no effect on the Al-29 signal. Therefore, any increase of the Al-28/Al-29 ratio in the doped silicate is due to the presence of aluminum. The subtraction of the Al-28/Al-29 ratio of the undoped sample from the Al-28/Al-29 ratio of the doped sample gave the portion of the Al-28 signal resulting from the Al-27(n, gamma)Al-28 reaction.Three forsterite single crystals with varying ratios of chromium to aluminum were grown for this study by the floating zone method using sol-gel derived feedstocks. Their compositions were determined by NAA using the correction procedure described above.
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关键词
near infrared,chromium,single crystal,neutron activation analysis
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