METHOD OF REPRODUCING TEST STANDARDS FOR LARGE-SIZE OBJECTS ON RESEARCH REACTORS Russian patent published in 2020 - IPC G21K5/00 

FIELD: physics.

SUBSTANCE: invention relates to a method for reproducing setpoints neutron fluence (F_ni), and the exposure dose of gamma-radiation (D_ni). Method is based on superposition of radiation fields from reactor and neutron converters to gamma quanta, determination of fluence of neutrons (F) with energies of more than 0.1 MeV and exposure dose (D) of gamma-quanta (object loading parameters) in the area of bilateral irradiation object selection according to the formula P·t=F_ni/F_p⋅C_F⋅k mode operation of the reactor and converters thickness (S) for depending CD (S), evaluation of uneven object loading parameters in the test volume of dependencies F (L, d) and D (L, d), as well as on movement of object relative to radiation source first in one side for time t₁ at power of reactor P, and after its rotation by 180° (on vertical or azimuth angle) – in reverse direction during time t₂=t₁ to initial position, where C_D=D_ni/D_p⋅P⋅t⋅k; C_F is a coefficient determined from the dependence of C_F(S); t=t₁+t₂ is duration of reactor operation at power; F_p and D_p – respectively values fluence neutron and gamma radiation in the reference point at a standard thickness of converters, defined by the calculated dependencies F_p (L, d), D_p (L, d) and normalized to one neutron from the reactor; k is proportionality coefficient, n/J; L and d are length and width of object (test volume).

EFFECT: possibility of radiation testing of objects with large dimensions.

1 cl, 8 dwg