This study describes the design of a neutron activator that contains a beryllium target, a lead/bismuth moderator, graphite/PbF₂ reflectors, and a boron absorber. Production of ⁹⁹ Mo isotope using millimeter-sized ⁹⁸ Mo samples located in various regions of the activator under study was also simulated using the MCNPX-code. If the ⁹⁸Mo samples are placed in the reflector region, the yield increases due to a larger flux of epithermal neutrons.

@article{Khorshidi:2019,
	author = {A. Khorshidi},
	title = {Molybdenum-99 production via lead and bismuth moderators and milli-structure-98Mo samples by indirect production technique using Monte Carlo method},
	publisher = {Physics-Uspekhi},
	year = {2019},
	journal = {Phys. Usp.},
	volume = {62},
	number = {9},
	pages = {931-940},
	url = {https://ufn.ru/en/articles/2019/9/f/},
	doi = {10.3367/UFNe.2018.09.038441}
}