Scientific, measuring and detecting apparatus and instruments; scientific, measuring and detecting apparatus and instruments, namely, spectrometers, X-ray fluorescence analysers and spectrometers, diffractometers, X-ray diffractometers and wafer analysers, neutron activation analysers, pulsed fast and thermal neutron activation analysers; X-ray fluorescence analysers and spectrometers; X-ray fluorescence (XRF) analysers and spectrometers; X-ray detecting apparatus and instruments; X-ray detec...