[en] A signal processing system is proposed, capable of accepting a counting rate which is limited only by the charge collection time of the detector and by the time of the sample-hold circuits employed. This system has not been assembled. The concept is presented in order to stimulate interest and development by others

No abstract available

[en] A novel ADC is described, consisting in its simplest and fastest version of a parallel ADC supplying the most significant bits, plus several suitably-connected difference amplifiers in which the input signal undergoes successive folding. Their common output is fed into another parallel ADC which supplies the least significant bits. The conversion rate is of the order of 400 MHz for eight bits. Several versions are described, yielding different trade-offs between speed and the number of discriminators employed. ((U.S.)

[en] A portable microdosimeter has been designed, covering a dynamic range of 120 dB in a single signal processing channel. A transistor is employed as non-linear element and deviation at low and high energies from a truly logarithmic characteristic is corrected by a microcomputer. A description of the basic design and experimental result are given

[en] Signals occurring in microdosimetric measurements cover a dynamic range of 100 dB at a counting rate which normally stays below 10⁴ but could increase significantly in case of an accident. The need for high resolution at low energies, non-linear signal processing to accommodate the specified dynamic range, easy calibration and thermal stability are conflicting requirements which pose formidable design problems. These problems are reviewed, and a practical approach to their solution is given employing a single processing channel. (author)

No abstract available

[en] Thermoelastic stresses in long metallic nuclear fuel rods are computed assuming a temperature dependent Young's modulus and a constant coefficient of the linear thermal expansion. A detailed numerical study of the boundary value problem is given. Two numerical procedures for solving the differential equation that lead to the same results are compared. (author)

[en] FEA in medicine combines the ease and accuracy of quantitation with radiotracers with the convenience and safety associated with the use of stable tracers. A major limitation in the utility of FEA is its comparatively low sensitivity. We address three techniques for improving quantitation accuracy: polarized excitation sources; pulse rise-time discrimination; and a third technique now under investigation: Anticoincidence shielding similar in concept to that used in low-level radionuclide counting. The techniques described here may permit extension of quantitation by FEA to 50-100 ppb tracer levels in unprepared biologic samples. (orig.)

[en] A numerical technique is developed for calculating combined conduction and radiation transient heat transfer in semi-transparent medium having a cylindrical geometry and temperature-dependent physical properties. The radiative components are introduced as a heat source and as an external heat flux. The finite element method is used to solve the governing equations for different boundary conditions. (authors)

[en] An investigation has been made of the possible improvement in resolution employing the rise time method, if the filter bandwidth is increased beyond that required for position linearity. To this end, the computed resolution and linearity of position information have been plotted as a function of the filter time-constant for RC and double-delay line shaping. High and low capacitance detectors have been considered. The plots yield an estimate of the improvement in resolution obtainable, if position linearity is disregarded. Preamplifier noise was assumed to be negligible. (Auth.)