Tantalum niobium ore is usually associated with natural radioactive elements such as uranium

thorium and radium

in the smelting process

it will cause different degrees of radioactive hazards to workers

if the slag is directly piled up without treatment

it will cause radioactive damage to the surrounding environment. The present situation of radioactive pollution in tantalum niobium smelting process is reviewed. The radioactivity of most of the slag is higher than the national standard

which belongs to low and medium level radioactive waste

the residual radionuclides in the wastewater increase the radioactivity of water

in addition

radon

as the radioactive daughter of uranium and thorium

diffuses into the air will causes certain air radioactive pollution. The tantalum niobium slag was analyzed by X-ray fluorescence spectrometry and X-ray diffraction

it is concluded that the slag is composed of various metal oxides and radioactive elements uranium and thorium

the content of iron is the highest

while that of uranium and thorium is relatively high. The activity of tantalum niobium slag is destroyed after smelting

so the activity concentration should be calculated by the activity of several characteristic nuclides under non-equilibrium condition. According to the different decay properties of each nuclide

within a specific decay time range

Calculating the activities of 3 radiation systems in equilibrium and unbalanced states

from the decay chain and the half-life of each nuclide

the calculation formula of total activity can be simplified to the related calculation of certain specific nuclide activity.