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1.
K. Ya. Gromov V. I. Fominykh V. G. Chumin Zh. K. Samatov 《Instruments and Experimental Techniques》2005,48(1):43-46
It is shown that peaks formed in -ray spectra by summing the pulses due to cascades can be used to determine both the activity of the radiation source and the efficiency of detecting the rays. Possible sources of errors in determining these quantities were investigated. This method may be used to measure the cross sections of nuclear reactions, to analyze the background radiation when searching for rare decays, and in other applications.Translated from Pribory i Tekhnika Eksperimenta, No. 1, 2005, pp. 58–61.Original Russian Text Copyright ¢ 2004 by Gromov, Fominykh, Chumin, Samatov. 相似文献
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A technique for high-speed γ-ray spectrometry was developed for γ-ray diagnostic experiments on the ITER tokamak and tested at the Ioffe Physico-Technical Institute on the cyclotron and the GLOBUS-M and TUMAN-3M tokamaks. This technique was used to upgrade the γ-ray diagnostic system of the JET tokamak. It was shown by the tests that the new technique compares favorably to the traditional one in that it allows the limiting counting rate of the spectrometer to be increased by at least an order of magnitude without noticeable deterioration of its energy resolution. 相似文献
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A. Kh. Khokonov M. B. Masaev Yu. V. Savoiskii 《Instruments and Experimental Techniques》2009,52(1):129-131
The problem of determining the 222Rn concentration in air from γ-ray spectra of radon progeny is solved using the aerosol filters method. The systematic error
of the method due to incomplete collection of radon progeny is determined. It is shown that, when comparing the filter activity
to the analytical calculation, the use of a 20-cm-diameter 20-cm-tall NaI(Tl) crystal and a 4−π geometry makes it possible
to measure radon concentration with an accuracy of 20-30%.
Original Russian Text ? A.Kh. Khokonov, M.B. Masaev, Yu.V. Savoiskii, 2009, published in Pribory i Tekhnika Eksperimenta,
2009, No. 1, pp. 142–144. 相似文献
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《Nuclear Instruments and Methods in Physics Research》1984,211(3):601-605
Some of the recent work on high resolution silicon strip detectors by the TU-Munich and MPI-Munich group is presented, in particular:
- •-investigation of the factors limiting the spatial resolution;
- •-use of silicon strip detectors as on-line triggers for the study of charmed particles in hadronic reactions;
- •-development of LSI (large scale integration) readout electronics for strip detectors.
5.
V. L. Romodanov A. G. Belevitin V. V. Afanasiev N. E. Dubenkov A. A. Pryakhin 《Instruments and Experimental Techniques》2016,59(1):120-126
A model of the setup for determining the 235U content of a fuel assembly for WWER-440 reactors is described. The setup operates based on the digital technology for discriminating neutron and photon scintillation responses. An AmLi source is used as an external neutron source. A three-channel system for detecting fission particle coincidences is based on EJ-309 scintillators. A set of digital codes for obtaining and analyzing neutron-neutron (nn), neutron-γ (nγ), and γ-γ (γγ) coincidences has been developed. Dependences of double coincidences have been experimentally obtained and analyzed with the aim of determining the 235U content of the fuel assembly. It is shown that fission neutrons and coincidences of the nn and nn + γn + nγ types are the best informative parameters for the 235U content of the fuel assembly. 相似文献
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A. A. Ananenko Yu. T. Vydai V. P. Gavrilyuk 《Instruments and Experimental Techniques》2002,45(2):178-182
The effect of the design features of a composite scintillation detector on the value and stability of its light yield under its exposure to both -particles and -rays was investigated. The phoswich detector was manufactured from a NaI(Tl) single crystal and scintillation polystyrene-based plastic. The light yield was measured in the detectors of a differing design. Comparing the experimental results with the simulation data, it was possible to trace the mechanism of light-signal formation in the phoswich. Some proposals were designed that helped improve the following performance data of a scintillation - and -ray detector: the light yield and its stability, pulse-height resolution, and peak-to-valley ratio. 相似文献
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Proverbio I Nocente M Kiptily VG Tardocchi M Gorini G;JET-EFDA Contributors 《The Review of scientific instruments》2010,81(10):10D320
High resolution γ-ray spectroscopy measurements were performed in JET (3He)D plasmas with high energy ion populations driven by radio-frequency (RF) heating. One of the first reactions investigated was 12C(3He,pγ)14N, which was observed at low 3He concentrations. In order to interpret the measurements in this work, cross section data for the 12C(3He,pγ)14N reaction are evaluated. Available data for the population of excited states in 14N up to the eighth level are assessed in the range E(3He) = 0–5?MeV. Discrepancies and gaps in the database have been solved by means of interpolations and consistency analysis. The evaluated cross section data are used to predict the intensity ratio of characteristic 2.31 and 1.63 MeV γ-rays. 相似文献
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M. D. Kheymits A. M. Galper I. V. Arkhangelskaja A. I. Arkhangelskiy Yu. V. Gusakov V. G. Zverev V. V. Kadilin V. A. Kaplin A. A. Leonov P. Yu. Naumov M. F. Runtso S. I. Suchkov N. P. Topchiev Yu. T. Yurkin 《Instruments and Experimental Techniques》2016,59(4):508-512
The task of selecting neutral γ rays from the background of charged particle fluxes, which arises in investigation of high-energy (>50 GeV) cosmic rays, is complicated by the presence of the backsplash effect. The backsplash is composed of a great number of low-energy (~1 MeV) particles produced in an electromagnetic shower being developed in the calorimeter of the γ-ray telescope. A technique of charged particle rejection using an anticoincidence system has been developed. A method for discriminating events of charged particle detection from γ-ray detection events accompanied by the backsplash phenomenon is proposed. This method is based on the difference of the signals in time and makes it possible to maintain a high detection efficiency even for high-energy γ rays. 相似文献
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王春雨 《机械工人(冷加工)》1986,(7)
SIIX-10节能自动疏水阀是根据浮力原理,使阀体内之浮子,随阀体内水位的变化,浮子作升降运动;以达到阀门启闭排水阻气的作用。气体经过压缩机压缩后温度升高,然后随着温度的下降,超过饱和状态的水分就变成水滴,在气罐、油水分离器、管道内析出。另外,为了保证压缩机的正常工作要使用润滑油,有一些润滑油也会随着进入这些部位。油和水会造成许多故障,会使阀类、气缸腐蚀而动作失灵;油和水如从气动工具和管道等处喷出会影响操作人员的正常工作,造成环境污染。因此这些油和水应及时从气罐、油水分离器、管道等处排放出来。 相似文献
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I. N. Chugunov A. E. Shevelev D. B. Gin V. O. Naidenov V. Kiptily T. Edlington B. Syme JET EFDA contributors 《Instruments and Experimental Techniques》2008,51(2):166-170
A 6LiH attenuator of a neutron flux incident on a detector is used to reduce the γ-ray background induced by neutrons in the detector material. This attenuator has been tested during experiments with deuterium (DD) plasmas on the JET tokamak. A specimen of the neutron attenuator with dimensions of ?30 × 300 mm has been developed by the Russian Academy of Sciences’ Ioffe Physico-Technical Institute and inserted into a vertical collimator used for γ spectrometry of plasmas. To compare γ-ray spectra recorded with and without the 6LiH attenuator being mounted, identical discharges with heating of the DD plasma by a neutral particle beam have been selected. For γ rays with energies of <3 MeV, which are induced by neutrons in the detector material, the suppression factor is found to be ~100. A low attenuation (~2) observed at energies of >3 MeV can be attributed to the transparency of the 6LiH attenuator for γ rays. This portion of the spectrum is due to γ radiation of the plasma and γ rays induced by neutrons in the constructional materials of the tokamak. To estimate the efficiency of the 6LiH attenuators as a mandatory component of the ITER γ-ray diagnostic system, it is necessary that measurements be taken in deuterium-tritium (DT) discharges. 相似文献
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国家科委、国家物价局等六个部门联合下达、机电部立项的HQ((44)/(45))10系列无磨损球型止回阀,由成都阀门厂开发成功。并于1992年11月通过鉴定。这项获实用新型的专利。系列球型止回阀,HQ44X-10型为单球密封、HQ45X-10型为多球密封,其设计构思巧妙新颖,利用进口端水介质压力的变化,实现自动断通。 相似文献
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多晶样品的 X 光衍射分析法有很多独特的优点,是一种重要的物理化学分析方法。除用作晶态化合物的鉴别外,在所有涉及物质晶体结构与其物理、化学性质关系的研究中,都有广泛的应用。多晶 X 光衍射仪整机由三个基本部分组成:(1)X 光光源,是一台带有自动稳定系统的强度高度稳定的 X-光发生器;(2)衍 相似文献
14.
Gorbunov M. A. Dudin S. V. Ignatyev O. V. Kupchinskaya E. A. Kupchinsky A. V. Morozov S. G. Pulin A. A. 《Russian Journal of Nondestructive Testing》2019,55(10):761-771
Russian Journal of Nondestructive Testing - A $$\gamma $$-introscopy method and an installation using “electronic focusing” of $$\gamma $$-quanta transmitted through the studied object... 相似文献
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The results of investigations of the characteristics of InP detectors manufactured from a bulk iron-doped material are presented. The characteristics were measured in a temperature range from room temperature to –60°C. At room temperature, at a voltage of 400 V, the back current in the InP detectors was under 10 A. The best spectrometric characteristics of the detectors were obtained at temperatures from –50 to –60°C. The spectra of 241Am, 109Cd, 57Co, and 137Cs sources recorded with InP detectors are presented. 相似文献
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