Narrow Results

Applications of X-ray fluorescence (XRF) spectrometer and electron accelerator are reviewed with regard to the historical development in Mongolia. The first XRF spectrometer was installed at Nuclear Research Laboratory, National University of Mongolia (NUM) in 1975. Since that time, XRF has developed into a suitable multi-elemental analysis technique with many fields of practical applications. In 1996, electron cycle accelerator (facility called Microtron MT22) was established at the Mongolian Academy of Science (MAS). The maximum energy is set to 22 MeV, suitable for routine activation analysis. The photo and neutron induced nuclear reactions and analysis of chemical elements in various samples and structure analysis of semi-precious stones were studied using the accelerator. Nevertheless, the MT22 is not used for particle induced X-ray emission (PIXE) analysis since it is difficult to obtain calibration parameters. In case of Mongolia, collected research samples are sent to Japan and New Zealand for PIXE analysis because this analysis method has higher sensitivity compared to conventional XRF method. In order to develop the X-ray research field in Mongolia, an international conference on X-ray analysis has been held every three years since 2006. Nowadays, there are above 20 laboratories in Mongolia which use the XRF methods and techniques, among them about 80 percent of them are utilized for fields of geology, mining and their industrial control processing and others are used for environment, monitoring control and research studies.

As elsewhere, accelerators in Canada have evolved from modest beginnings to major facilities such as TRIUMF (currently with the highest-power driver for rare isotope beam production) and the third generation Canadian Light Source. Highlights along the way include construction of the first microtron, the first racetrack microtron and the first superconducting cyclotron (to which list might have been added the first pulse stretcher ring, had it been funded sooner). This article will summarize the history of accelerators in Canada, documenting both the successes and the near-misses. Besides the research accelerators, a thriving commercial sector has developed, manufacturing small cyclotrons and linacs, beam line components and superconducting rf cavities.

In this work we present results of our study of isomeric ratio using the method of gaseous flow and the angular momentum of fragment ¹³⁵Xe produced in photofission of heavy elements ²³²Th, ²³⁷Np, ²³⁸U, ²⁴³Am and ²⁴⁸Cm induced by 25 MeV bremsstrahlung produced at Microtron MT-25 of the Flerov Laboratory of Nuclear Reaction, JINR, Dubna, Russia. On the basis of the statistical method proposed by Huizenga and Vandenbossch the root mean square angular momentum of the fragment corresponding to the measured isomeric ratio was deduced. The results are discussed and compared with those by other authors.

As elsewhere, accelerators in Canada have evolved from modest beginnings to major facilities such as TRIUMF (currently with the highest-power driver for rare isotope beam production) and the third generation Canadian Light Source. Highlights along the way include construction of the first microtron, the first racetrack microtron and the first superconducting cyclotron (to which list might have been added the first pulse stretcher ring, had it been funded sooner). This article will summarize the history of accelerators in Canada, documenting both the successes and the near-misses. Besides the research accelerators, a thriving commercial sector has developed, manufacturing small cyclotrons and linacs, beam line components and superconducting rf cavities.