Preliminary study on forgery identification of Hetian Jade with Instrumental Neutron Activation Analysis.

In this study, Instrumental Neutron Activation Analysis (INAA) was applied to study the elemental information of geological samples with the assistance of chemometric techniques. Samples of genuine Hetian Jade from Xijiang Province of China, counterfeit jade samples purchased at the neighborhood market, and granitoid samples from the same geographic location of genuine Hetian Jade were analyzed using INAA. The preliminary study indicates that INAA, with the help of principal component analysis (PCA), can be applied to obtain the multi-elemental concentrations of geological samples with high sensitivity, thereby effectively differentiating genuine Hetian Jade from counterfeit ones.

Sc-47 production from titanium targets using electron linacs.

In this work we have studied the feasibility of photonuclear production of (47)Sc from (48)Ti via (48)Ti(γ,p)(47)Sc reaction. Photon flux distribution for electron beams of different energies incident on tungsten converter was calculated using MCNPX radiation transport code. (47)Sc production rate dependence on electron beam energy was found and (47)Sc yields were estimated. It was shown that irradiating a natural Ti target results in numerous scandium isotopes which can reduce the specific activity of (47)Sc. Irradiating enriched (48)Ti targets with a 22MeV 1mA beam will result in hundreds of MBq/g activity of (47)Sc and no other isotopes of scandium. Decreasing the size of the target will result in much higher average photon flux through the target and tens of GBq/g levels of specific activity of (47)Sc. Increasing the beam energy will also result in higher yields, but as soon as the electron energy exceeds the (48)Ti(γ,np)(46)Sc reaction threshold, (46)Sc starts being produced and its fraction in total scandium atoms grows as beam energy increases. The results of the simulations were benchmarked by irradiating natural titanium foil with 22MeV electron beam incident on the tungsten converter. Measured (47)Sc activities were found to be in very good agreement with the predictions.