A method of tagged neutrons.
The method of labeled neutrons determines the presence and concentration of various chemical elements and substances contained in large pieces of ore (particle size up to 100 mm weighing up to 5-10 kg) without sample preparation in field conditions.
The method of labeled neutrons:
Tagged neutron method consists in irradiation of the object of study with fast neutrons with energy of 14 MeV produced in the reaction d+t→α+n, and the subsequent gamma rays (γ) of the characteristic radiation of the investigated object.
A gamma quantum (γ) is a photon of large energy, i.e. the quantum of gamma-radiation. Conventionally, gamma rays consider photons with energy above 10 Kev. Gamma rays can be emitted (absorbed) atomic nuclei in the transition from one quantum state to another, with transformations of elementary particles, the deceleration of charged particles of high energy, synchrotron radiation.
Each chemical element has its own spectrum of gamma-rays, which allows by measuring the energy distributions of the characteristic γ-radiation to determine the presence in the object, it is this chemical element, even if it is shielded or closed by the other substance, for example, is hidden in a safe or surrounded by a mountain rock.
The method of labeled neutrons determines the presence and concentration of such chemical elements as Na, Mg, C, N, O, F, Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, Zr, Pb, Sn, Bi, contained in large pieces of ore (particle size up to 100 mm weighing up to 5-10 kg) without sample preparation in field conditions. By identifying the chemical elements and their concentrations identifitseerida the substances formed by the specified chemical elements.
Including the method of labeled neutrons determines the presence and concentration of kimberlite ore natural diamonds, and explosive, narcotic and other dangerous substances in the investigated objects.
Note: © Photo //www.pexels.com, //pixabay.com