SU1235327A1 - Method of graduating liquid transducer of parameters of acoustic and seismic fields method of determining effectiviness of radiation action on materials - Google Patents

Abstract

METHOD FOR DETERMINING THE EFFICIENCY OF RADIATION EXPOSURE ON MATERIALS, comprising that the examined object together with the radiation detectors obluchzyut pulse gamma and neutron radiation intensity recorded separately both kinds of radiation, measured the effect of radiation exposure on the examined object, characterized in that, in order Increasing p) productivity and reducing labor costs when the object is irradiated with ^ {radiation pulses, the duration, the back front of which is shorter than the time of fast neutrons, is one temporarily with object vi detectors, a neutron moderator located along the radiation flux behind the object and the detectors is made of a substance that slows down neutrons by an inelastic scattering reaction, and the intensity of both types of radiation and the effect of exposure are recorded at least twice at time points, one of which corresponds to the time interval near the maximum of the pulse amplitude, and the other to the time interval corresponding to the falling edge of the pulse, and the effect of each type of radiation op Yedelev dissolved by results of said izmereniy.Q < & T / ^

Description

DSEucmoonioi ij The invention is related to the field of radiation (: radiation or optical radiation, more specifically to the radiation field of radiation effects in materials and structures, and can be used to determine the effect of radiation, ammonia radiation and neutrons from nuclear reactors on the sample. The purpose of the invention Increasing productivity and reducing labor costs when the object is irradiated with a radiation pulse, the duration of the back front of which is shorter than the time of fast neutrons is slowed down. and slowing down the reactor body radiation, FIG, 2 according neutron intensities (curve), gamma-izlzcheni (curve) 1) and radiation-nanedennogo effect (curve sh) in a sample from vrems and measured from the time of occurrence of the pulse KEYtronov,. To study the effect of an instantaneous change in the conductivity of a semiconductor wafer in a polyethylene sheath under the action of gamma radiation and neutrons, sample 1 and two detectors 2 and 3 are being investigated, of which a fast non-tron type detector is compensated for by a vacuum signal. on a dividing chamber (VCD) with a radiator and, and the other - KOBbrti semiconductor dosimeter gamma {a-radiation type AIDS, sensitive. {element of which is a silicon crystal, is placed together near an array of moderator screen 4, extracted from reinforced concrete The detectors select such that their dependences of the effective sensitivity of the energy of the corresponding type H3Jty4eH fH are approximately matched by the dependences of the coefficients on the carrier density of electron-hole pairs in the sample on the energy of these components. Communications radiation field. The irradiation is carried out from one side of the detector with a pulse of the sample — a pulse-neutron radiation of the reactor 5 with a duration at half the maximum value of 10 sec. At the same time, the result of neutrons slowing down by the reaction on the screen material fi (fi) in the time interval corresponding to the falling front of the radiation pulse to the gamma radiation of the uranium dividing reaction emitted by the active zone of the reactor, contributes to the radiation emitted by the inaccessible scattering (h, h) of the neutrons that were emitted by the active zone earlier at the front and at the maximum of the radiation pulse, i.e., on the rear edge of the radiation pulse at the location of the sample under study The ratio between the gamma and neutron components, the dependences of the signals of the ECT iCt), SPDD J, (i) and in the sample 3 (1) under study, is measured from the time t. In this case, the signals are connected with the radiation field components by the formulas 3ai-T (t) Jl (, (EJb, (EJ-dE, Py (t) "S (6y) b / .E) c / Ey:), ( 1) f (.) H (E, E, E, L, (and P, (} | kg (.,) L (,., W- () f (t, neutron flux density and gamma radiation dose rate, respectively ; RC STT 2 Effective sensitivity of the detectors to neutrons and gamma quanta, respectively, gutsr -: cr p K, K, y Effective coefficients JIJJlennye efficiency of the neutron and gamma-irradiation of the γ-ray, respectively, into the observed effect Bd, (EM) radiation density of gamma-gamma, respectively, to the observed effect of gamma-gamma, respectively, to the observed effect of gd, (EM) radiation density of gamma-ray, respectively and neutronopters, respectively, in energy m, f, lif ,, is the energy of gda-dacanths and neutrons, respectively, 3clx |) eKTj observed in a sample, in most cases proportional to the number of defects5 formed: in it radiation, therefore, k are similar to the corresponding dependences of the effective coefficients of the formation of defects in the sample from the energy of the components of the radiation field.

3

Find the ratios of the signals J (ij / / J, (t) j) and verify that J, (t) / J, (i) 5; const.

We fix the detector readings and the magnitude of the electric current through the inspected sample at the instants of time .t and tg3 10 s and find the dependence of the efficiency of gamma radiation exposure to 1 on the time t using the formula

.p.Ct,) 3 (i, t

t,. J (u I

V (t

35327 &

Eff}: the efficiency of the effect of nert radiation is determined as follows

J, U,)

i. .3 (1,

O. (t)

(t

J (i) Ci}

J, (tj j, (tj

j (t;

. (i) J, (t) Thus, the proposed method allows to increase labor productivity and reduce labor costs in the study of radiation induced effects in the elements and. materials by reducing the number of exposures to one.

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