A new boron-silicon gel ion emitter is developed for lead isotope analysis. As a result, a sensitivity of about 10^-7As/μg can be obtained, which permits mass
The mechanism of Nd.Ta-mineralixation is diseussed in the light of the properties of Nb-,Ta-complexes in different phases.Experiments show that Nb and Ta are es
Polishing is carried out on a rotating rubber disc in this method. Rubber of high quality with good elasticity is required and the rubber disc is grooved for ho