METHOD FOR PRODUCTION OF TRITIUM-LABELED NANODIAMONDS Russian patent published in 2018 - IPC C01B32/15 C01B32/28 B82B3/00 B82Y40/00 

FIELD: chemistry; physics.

SUBSTANCE: invention can be used in physico-chemical and biological research. First, an aqueous suspension of nanodiamonds is prepared with an average particle aggregation size of not more than 125 nm and a dispersed phase content of 0.15 to 0.4 mg. Resulting aqueous suspension is treated with an immersion ultrasonic radiator at a frequency of 22 kHz and an acoustic power of 30–60 W to obtain a particle aggregate size of not more than 50 nm. Ultrasonically treated aqueous suspension is uniformly applied to the walls of the vessel containing the tungsten filament and lyophilic drying of the deposited slurry is carried out until a film is obtained. After that, air is removed from the vessel, tritium gas is introduced into it, which is activated by heating the tungsten filament to 1,800–2,200 K for 5–15 seconds. During the activation of tritium, the wall of the vessel with deposited nanodiamonds is maintained at a temperature of 290–298 K while simultaneously cooling the bottom of the vessel to the temperature of liquid nitrogen. Then, the residual gas is removed, the tritium activated film is resuspended in water. Obtained suspension with tritium labeled nanodiamonds is removed from the vessel.

EFFECT: invention provides an increase in the specific radioactivity of nanodiamonds to 5–9 TBq/g.

4 cl, 6 ex