Showing papers in "Nuclear Instruments and Methods in 1972"

TL;DR: In this paper, the extrapolated or practical range R ex of monoenergetic electrons in the energy region 0.3 keV-30 MeV for the absorbers of atomic number 6-92 has been found to be expressed by a single simiempirical equation of the form R ex =a 1 [( 1 a 2 )n(1+a 2 τ)− a 3 τ (1+ a 4 τa 5 ) ], where τ is the incident kinetic energy in units of the rest energy of the electron, and the parameters a i ( i =

TL;DR: Analysis of the relative noise performance of many types of pulse-shaping systems is discussed in terms of recent work on noise analysis, and applications of the technique to time-variant as well as time-invariant systems are illustrated.

TL;DR: In this article, an iterative relaxation technique is presented for unfolding three-dimensional distributions from a series of two-dimensional projections taken at several different orientations relative to the object being investigated.

TL;DR: In this paper, a systematic tabulation has been made of the response functions for 3″ x 3″ detectors irradiated with broad parallel beams of gamma rays, at energies between 100 keV and 20 MeV.

TL;DR: In this paper, the track registration efficiencies of various glasses, plastics and mica for fission fragments of various average energies and for alpha particles have been calculated on the basis of a series of new experiments in which exposures were made in 2π and other geometries.

TL;DR: In this article, the relative variance of the pulses from the gas proportional scintillation counter was measured for a full width half maximum of 500 eV for 59 keV and the possibility of using the counter for fast coincidence work is considered.

TL;DR: In this paper, a method for computing the finite solid-angle correction factors for coaxial Ge(Li) detectors is presented, in particular the correction factors Q k for odd k. The computer program employed for the calculation, and the results of the calculation are compared with experimental values.

TL;DR: In this article, the complex potential of an infinite grid of thin wires lying between parallel grounded electrodes is studied and the following problems are discussed: 1) the electrostatic coupling between wires, 2) the effect of varying the diameter of a single wire, 3) the impact of displacing a wire.

TL;DR: In this paper, the response of NE-213 scintillators to electrons in the energy range from 0.3 to 1 MeV has been investigated and the peak of the Compton distribution was found to be the most accurately defined point of Compton distribution for the methods used.

TL;DR: In this article, the dependence of resonance line width, resonance area, and magnitude of the Mossbauer effect on film thickness is analyzed for backscattering spectra obtained via the conversion electron, and an exponential attenuation law and Fermi-age/diffusion theory are used and intercompared.

TL;DR: In this article, the deterioration with time of multiwire proportional chambers using isobutane as one component of the gas mixture is studied and it is shown that by addition of methylal among others, a long lifetime can be obtained without changing the properties of gas mixture.

TL;DR: In this article, the delta-ray theory of track structure is applied to such 1-or-more hit detection systems as the inactivation of dry enzymes and viruses, the NaI(Tl) scintillation counter, and nuclear emulsion, is extended to the silver activated phosphate glass dosimeter, the LiF thermoluminiscent dosimeter and the creation of free radicals in solid biological substances.

TL;DR: A high-sensitivity gamma-ray spectrometer incorporating a high-performance Ge(Li) detector and a NaI(Tl) well detector has been developed in this paper.

TL;DR: In this article, the authors measured the neutron detection efficiency of a liquid scintillator (NE-213, 12 cm diam. × 5.7 cm) with various bias settings corresponding to proton energies from 1 MeV to 6 MeV.

TL;DR: A detailed description of the hitherto fastest pneumatic tube system with only 20 ms or 15 ms transfer time is given using compressed nitrogen or helium, respectively, to transport the sample as mentioned in this paper.

TL;DR: In this paper, a phase-compensated distributed parameter electromagnetic delay line suitable for the readout of the positions of ionizing tracks in multi-wire proportional chambers is described, where the coupling coefficients between the chamber and delay line are approximately 3 to 10%.

TL;DR: In this paper, the energy loss of a charged ring passing an infinitely long periodic sequence of rf accelerating cavities is calculated by expanding the vector potential into a series of eigenfunctions of the empty waveguide and computing their individual excitation.

TL;DR: In this paper, a simple additive correlation procedure is proposed as a tool in the automatic examination of spectra for peak centroid and intensity information, which is illustrated in the analysis of data collected during a study of thermal neutron capture in argon.

TL;DR: In this article, the authors measured the neutron energy spectra of 239PuBe sources containing 2, 14, 80, and 160 g of Pu using a simple stilbene crystal, fast neutron spectrometer and a long counter.

TL;DR: In this paper, a mini-orange-type combination of permanent magnets can separate electrons from positrons using a filter in front of a Si(Li) detector, and the magnet system enhances the detection efficiency of conversion electrons and suppresses the influence of β + -, α-, p- and γ-radiaton.

TL;DR: In this article, a trapezoidal filter was realized by a time-variant (gated filter) system and the results obtained with large germanium detectors at high rates and higher energies were presented.

TL;DR: In this paper, heavy ion sputtering is a powerful method for the production of thin films of refractories, and both supported and self-supported films have been made, and the purity of the targets depends mainly on the purity in the starting material.

TL;DR: A new type magnetic spectrograph for charged-particle nuclear-reaction studies has been put into operation in conjuction with the Heidelberg MP-Tandem Van de Graaff accelerator as discussed by the authors.

TL;DR: In this article, the authors derived the third order transfer matrices for the fringing field of magnetic and electrostatic quadrupole lenses in an effective fourth order approximation under the assumption that the extension of the Fringing field is of about the same size as the beam diameter.

TL;DR: In this article, the sensitivity of elemental analysis by charged-particle induced X-ray fluorescence was examined by measuring characteristic X-rays cross sections for K α, K β, L α, L β, L γ, and M transitions for many elements and bremsstrahlung backgrounds from thin mylar, kapton, and teflon films between 0.7 and 8 mg/cm 2 thickness.

TL;DR: In this paper, a proportional proportional chamber with a helical cathode for delay line readout has been developed and studied in detail, which gives cathode delay line pulses nearly as large as the anode pulses, and hence is well-suited for minimum ionizing particles.

TL;DR: In this article, a rotating target is described for an intense source of 14 MeV neutrons, where the source strength decreases to half its initial value in about 100 h of continuous operation.