SU424256A1 - SPECTROMETER OF CONNECTIONS - Google Patents

Description

one

The invention relates to the field of nuclear spectroscopy and can be used when conducting two-dimensional measurements of j-y, e-Y, (3 + -Y T-D-coincidences, in which it is desirable to obtain information on complete processes in full. At present, such measurements are a necessary step in conducting studies on the decay of radioactive isotopes. The tendency to conduct research on isotopes with a short half-life requires the creation of facilities that allow obtaining information in the shortest possible time me

The absence or insufficient amount of information to be obtained about coincidences in a number of cases makes it impossible to identify the cascades when drawing up diagrams of the levels of the isotopes under study.

Known spectrometer, working on the method of total matches. It consists of two identical spectrometric channels, the outputs of which are connected to the inputs of the coincidence circuit and the inputs of the linear amplitude adder. The pulses from the output of the linear adder arrive at the differential amplitude discriminator and from there to the input of the second coincidence circuit. The output of the first coincidence circuit is associated with the second input of the second coincidence circuit. Output of this circuit

connected to the control input of the linear gate, iio. a functional input of which pulses are supplied from the output of one of the linear amplifiers. From the linear gate exit

pulses are fed to a single or multi-channel amplitude analysis device. If you enable multiple differential discriminators of linear gates and recording devices at the same time, you can

parallel registration with several “windows.

The disadvantage of such a spectrometer is the impossibility of separation in the total spectrum of cascade gamma transitions with the same values of the difference in extreme energy levels.

Other techniques are required for such separation, which complicates the experiment. To separate cascade gamma transitions in the spectrum with the same values of the differences between the extreme energy levels, attenuators and nonlinear conversion units are introduced into the proposed spectrometer, and the output of each linear

the amplifier is connected to the input of one of the attenuator and one of the nonlinear conversion units, the outputs of which are connected to the inputs of a linear adder, one of which is connected to the output of the generator

control amplitudes, input ko3

Secondly, it is connected to the output of coincidences, the inputs of which are connected to the outputs of the detectors are irradiated, and the output of the linear adder is connected to the input of the non-linear conversion signal, the output of which is connected to the input of the differential amplitude detector.

The drawing shows a block diagram of the device proposed, including a spectrometric nuclear radiation sensor 1, a radiation source 2, a nuclear radiation spectrometer 3, a coincidence circuit 4, a linear impulse amplifier 5, a nonlinear conversion unit 6, a constant generation unit (voltage pulses adjustable nlpchipy), block 8 nonlinear transform, linear amplifier 9, attenuators 10 and 11. lineum adder amnlituts 12, circuit 13, differential ammunition discriminator 14, line The first gate 15, the block and the recordings 16 and the block 17 of the pelinear transformation.

Source 2 is installed between the spectrometric sensors of nuclear pts 1 and 3. P1 pulses from their outputs are supplied to the inputs of the coincidence circuit 4 and pa inputs to linear amplifiers 5 and 9. If attenuators 10 and 11 and block 7 are i; is turned off, the pulses from the outputs of the amplifiers arrive at the linear adder amplitude 12 only through blocks 6 and 8.

For further consideration; 1 that blocks 6 and 8 execute the functions, squaring the square of the entries of the entry points. Then, at the output of the linear adder, we obtain the sum of squares of the impulse impulse, co1 nanog. Block 17 performs the noBTOpnoiO non-piped transformation function, for example, in this example of extracting a square root of the extreme values of incoming signals on its input spgna.

If you select the Differential Discriminator discriminator window with the rest, two-dimensional

The field of coincidence of selection will be the following: opt., centric circles with a center M at the beginning of the coordinate system. If it is required to shift the center of the circle along the axis of the symmetry of the floor of the joint, it is necessary to multiply the linear signals from the outputs of the amplifiers by a constant. This is achieved by installing attenuators in the appropriate positions and adding copstaps of adjustable amnlituds, which is achieved by switching on block 7 when the impulse is received from the output of the coincidence circuit 4.

After receiving the sparger pulse pa output circuit coincidence 13 opens

the linear gate scheme, and the pulses from the output of the amplifier 5 through the functional input arrive at the input of the block 16.

Subject invention

Coincidence spectrometer containing radiation detectors, coincidence circuits, linear pulse amplifiers, linear adder of pulse amplitudes, differential

amplitude discriminator, linear transmission scheme and amplitude analysis and recording unit, in order to separate alternative cascade gamma irons with the same values of total energy, in which attep are inserted; Each linear amplifier is connected to the input of one of the attenuators and the input of one of the non-linear units.

transformed, the outputs of which are connected to the linear input of the linear adder, one of which is connected to the output of the generator amplitude; t adjustable magnitude. the input of which is connected to the output of the coincidence circuit, inputs

which is connected to the outputs of the radiation detectors, and the output of the linear adder - to the input of the block of the transformed transducer, the output of which is to the audio from the input of the diffuper, ial) Noh amplitude discriminator.