共查询到20条相似文献,搜索用时 46 毫秒
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介绍了一种用于等离子体焦点装置(DPF装置)中子波形测量的塑料闪烁体探测器,该探测器由ST401型塑料闪烁体、XP2262B型光电倍增管构成。利用银活化中子探测器和DPF装置对该塑料闪烁体探测器进行标定,确定其中子灵敏度为0.022 5 pC每中子,,中子产额测量范围达到109~1011每脉冲,可以满足DPF装置中子参数测量的需要。 相似文献
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韩惠林 《工程物理研究院科技年报》2004,(1):48-49
ST401塑料闪烁体响应时间快,在脉冲中子源方法测量瞬发中子衰减常数中常用作中子探测器,同时它对于r射线也灵敏。利用加速器DT中子源、裂变谱中子源和^60Co同位素源,分别测量了三种尺寸的ST401塑料闪烁体的裂变谱中子和r射线的灵敏度。 相似文献
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选择3种典型光电耦合器开展了反应堆中子辐照实验,中子注量为3×1011~5×1012cm-2时,位移效应导致电流传输比下降,饱和压降提高。发光器件相同,探测器为Si PIN光电二极管的光电耦合器比探测器为Si NPN光敏晶体管的光电耦合器的初始电流传输比要小,但其抗位移损伤能力更强。探测器均为Si NPN光敏晶体管,发光器件为异质结LED要比硅两性掺杂LED的光电耦合器的电流传输比抗位移损伤能力提高2个量级;以光敏晶体管为探测器的光电耦合器,在较大的正向电流和输出负载电阻条件下工作可提高抗辐射水平。此外,光电耦合器的位移损伤存在加电退火效应。 相似文献
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近年来,涂硼电离室已逐渐成为核反应堆周围大通量中子/γ射线混合场监测的辐射探测器之一. 研制了一种高灵敏度涂硼电离室,并给出了其内部结构.用fA级弱电流放大器测得: 当涂硼电离室的工作电压在700 V以下时,漏电流小于1.0 pA; 用Am-Be中子源辐照时测得涂硼电离室的电流曲线坪长为500 V, 坪斜为3.72×10-4 V-1;当涂硼电离室的工作电压为400 V时, 对应漏电流为0.4 pA.测试表明涂硼电离室中子信号电流与辐照源的相对位置有关, 将Am-Be中子源置于距石蜡慢化体底部8 cm时,测得中子信号电流最大值为2.0 pA. 用137Cs和90Sr辐照时测得涂硼电离室γ射线信号电流为 1.0---2.0 pA,但在γ射线场中坪特性不如中子场中坪特性明显. 电离室中子探测灵敏度达1.0×10-15 Acm2s量级, γ射线探测灵敏度达9.0× 10-22 Acm2s·eV-1量级. 这种涂硼电离室漏电流小、灵 敏度高、坪特性好,可用于反应堆周围的中子/γ射线混合场测量. 相似文献
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P. Vigoureux 《Contemporary Physics》2013,54(6):440-446
Formulae for the radiation pressure of electromagnetic and of sound waves are reviewed. The pressure on an obstacle in the path of the waves can be calculated from the momenta of the incident and scattered trains, and it is now well established that any train of waves of intensity J propagated with speed v has momentum J/v 2 per unit volume. A general proof of this result is proposed, independent of the nature of the waves. 相似文献
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Burke Ritchie 《Foundations of Physics Letters》1991,4(4):375-384
I solve Maxwell's equation for a current produced by a classical, point electron. My solution, which represents the self electromagnetic field of the electron, can be found along the electron trajectory, where the conventional retarded-time solution is singular. The solution is in the form of an integral over all spectral frequencies of the field and has an Ehrenfest correspondence with the operator field of quantum electrodynamics (QED). Use of the field in the equation of motion for a harmonically-bound electron leads to an equation having the same form as the Schrödinger equation for a two-level atom interacting with the QED vacuum field. 相似文献
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C. H. Becker 《Zeitschrift für Physik A Hadrons and Nuclei》1957,148(3):391-401
Radiation magnetization represents a new electron induction effect within ferrites resulting in real permanent magnetization, dynamically induced and detected by means of microwaves Strahlungsmagnetisierung kennzeichnet einen neuen Effekt der Elektronenanregung (electron induction) innerhalb von Ferriten. Strahlungsmagnetisierung ist eine reelle permanente Magnetisierung, die von Mikrowellen dynamisch induziert und gemessen wird. 相似文献
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本文简要介绍近地空间辐射环境及其对飞行器材料、电子器件的影响.还扼要介绍了空间辐照效应的研究动态.This paper briefly dicusses the radiation environment in near-earth space and it s influences on material, and electronic devices using in space airship, also, the research developments in space radiation effects are introduced. 相似文献
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The results of experimental investigation of a new phenomenon - appearance of an emf across a single germanium sample subject both to irradiation with charged particles and to uniaxial deformation in a direction perpendicular to the particle beam (radiation piezoelectric effect - RPE) - are reported. 相似文献
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Coherent synchrotron radiation (CSR) is now an established source of radiation in the terahertz region, with flux capabilities many orders of magnitude higher than conventional SR sources. Accordingly, CSR is playing an ever-increasing role in the field of Far-IR spectroscopy at synchrotron facilities around the world. However, with the improvement in spectroscopic resolution, the incident CSR spectra from several facilities are displaying intensity profiles that appear to be modulated by periodic peaks or deep indentations, while theory predicts a featureless distribution. After eliminating the usual suspects, like multiple reflections from windows, etc., one looks for a deeper explanation, such as the role played by the radiation impedance. This impedance is largely defined by the vacuum chamber in the region of the bend magnets, but probably with some effects from the straight sections as well. 相似文献
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G. A. Vergunova V. B. Rozanov A. S. Grushin V. G. Novikov N. Yu. Orlov O. N. Rozmej 《Journal of Russian Laser Research》2013,34(5):441-452
We investigate the nonlinear radiative thermal conductivity model, which is theoretically well substantiated and based on a small number of assumptions. We consider the spatial and temporal evolutions for a low-density polymer foam heated by radiation waves taking into account the dependence of the absorption coefficients on the quantum energy. The form of the radiation wavefront (its slope and speed of propagation) differs from the classical form by a low-temperature “tongue” penetrating deep into the plasma. The plasma in this segment of the wavefront is heated up to a temperature of 1–2 eV by photons in the hard part of the spectrum, with energies for which hν/kT?>?4. We simulate numerically the experiments at the PHELIX facility to heat a low-density cellulose triacetate (TAC, C12H16O8) taking into account the radiation transfer. The energy and the spectral flux of radiation that passed through the TAC layer are satisfactorily consistent with the experimental results. 相似文献