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[en] The Australian Radiation Laboratory Diffusion Battery was created in 1992 to evaluate radon progeny dose coefficients based on measured aerosol conditions. The Australian Radiation Laboratory Diffusion Battery used filters, alpha counters and a legacy laptop computer running a PowerBASIC program that controlled the hardware. Because technology has evolved, the original system is not supportable. A replacement system consisting of separate hardware and software modules has been created. The hardware counting module is based on the proven design of the Effective Dosimeter, using modern detectors, electronics, flow sensors, a micro-controller and a secure digital memory card for data storage. The analysis of the data has been implemented in an Excel spreadsheet with Visual Basic for Applications coding to do loops and iterations. Tests of the software with current and historic data sets, all taken with the original Australian Radiation Laboratory Diffusion Battery system, have validated a modern, supportable diffusion battery system. (authors)
[en] The probabilities of locating peaks with a high relative peak-area uncertainty were determined empirically with nine types of peak-location software used in laboratories engaged in gamma-ray spectrometry measurements. It was found that it is not possible to locate peaks with a probability of 0.95, when they have a relative peak-area uncertainty in excess of 50%. Locating peaks at these relatively high peak-area uncertainties with a probability greater than 0.95 is only possible in the library-driven mode, where the peak positions are supposed a-priori. The deficiencies of the library-driven mode and the possibilities to improve the probabilities of locating peaks are briefly discussed. © 2019 Elsevier Ltd
[en] In this paper, we present three new classes of q-ary quantum MDS codes utilizing generalized Reed–Solomon codes satisfying Hermitian self-orthogonal property. Among our constructions, the minimum distance of some q-ary quantum MDS codes can be bigger than . Comparing to previous known constructions, the lengths of codes in our constructions are more flexible.
[en] In this paper, we consider to use the quantum stabilizer codes as secret sharing schemes for classical secrets. We give necessary and sufficient conditions for qualified and forbidden sets in terms of quantum stabilizers. Then, we give a Gilbert–Varshamov-type sufficient condition for existence of secret sharing schemes with given parameters, and by using that sufficient condition, we show that roughly 19% of participants can be made forbidden independently of the size of classical secret, in particular when an n-bit classical secret is shared among n participants having 1-qubit share each. We also consider how much information is obtained by an intermediate set and express that amount of information in terms of quantum stabilizers. All the results are stated in terms of linear spaces over finite fields associated with the quantum stabilizers.
[en] This book gives an introduction to quantum mechanics with the matrix method. Heisenberg's matrix mechanics is described in detail. The fundamental equations are derived by algebraic methods using matrix calculus. Only a brief description of Schrödinger's wave mechanics is given (in most books exclusively treated), to show their equivalence to Heisenberg's matrix method. In the first part the historical development of Quantum theory by Planck, Bohr and Sommerfeld is sketched, followed by the ideas and methods of Heisenberg, Born and Jordan. Then Pauli's spin and exclusion principles are treated. Pauli's exclusion principle leads to the structure of atoms. Finally, Dirac´s relativistic quantum mechanics is shortly presented. Matrices and matrix equations are today easy to handle when implementing numerical algorithms using standard software as MAPLE and Mathematica.
[de]Das Buch gibt eine Einführung in die Quantenmechanik mittels Matrizenrechnung. Heisenbergs Matrizenmechanik ist darin ausführlich beschrieben und die grundlegenden Gleichungen werden mit algebraischen Methoden und Matrizen berechnet. Während in vielen Lehrbüchern die Quantenmechanik mittels Schrödingers Wellenmechanik behandelt wird, findet sich in diesem Werk nur eine kurze Einführung in diese, um ihre Äquivalenz zu Heisenbergs Matrizenmethode zu zeigen. Im ersten Teil des Buches wird die historische Entwicklung der Quantentheorie durch Planck, Bohr und Sommerfeld beschrieben, gefolgt von den Ideen und Methoden von Heisenberg, Born und Jordan. Anschließend wird auf Paulis Spintheorie und auf sein Ausschließungsprinzip eingegangen, welches letztlich zur Struktur von Atomen führt. Abschließend wird Diracs relativistische Quantenmechanik kurz beschrieben. Die vorkommenden Matrizen und Matrizengleichungen können heutzutage leicht mittels numerischer Computeralgorithmen, wie z.B. MAPLE oder Mathematica gehandhabt werden.
[en] Entanglement-assisted quantum error-correcting codes (EAQECCs) make use of preexisting entanglement between the sender and receiver to boost the rate of transmission. It is possible to construct an EAQECC from any classical linear code, unlike standard quantum error-correcting codes, which can only be constructed from dual-containing codes. However, the number c of required ebits, which is an important basic parameter of an EAQECC, is usually calculated by computer search. In this paper, we construct four classes of MDS entanglement-assisted quantum error-correcting codes (MDS EAQECCs) based on k-Galois LCD MDS codes for some certain code lengths, where the parameter of ebits c can be easily computed algebraically and not by numerical search. Moreover, the constructed four classes of EAQECCs are also maximal-entanglement EAQECCs.
[en] This study aims to develop an Automatic Brain Dose Estimation (ABDE) methodology for head computed tomography examinations. The ABDE is to be applied first to an anthropomorphic Alderson phantom to obtain a Correction factor (Cf) between the ABDE and the direct absorbed brain dose using dosemeters positioned within the anthropomorphic phantom. Then, in order to estimate the correct brain dose for patient, the Cf was multiplied by the mean ABDE values for each patient. Results were compared to those registered with a mathematical simulation phantom using CT-Expo V 2.4 software. Results showed no significant difference between the correct ABDE values and the CT-Expo values with a mean percent difference of 2.54 ± 0.01%. In conclusion, ABDE yields a correct estimation of brain dose, taking into account the size and attenuation of the irradiated region. Thus, it is clinically recommended for accurate patient brain dose assessment. (authors)
[en] Fundamental role of nuclear analytical methods in nuclear forensics is emphasized, particularly that of spectroscopic ones. ANGLE software for advanced quantitative gamma spectrometry is briefly presented and its potential for applicability in nuclear forensics is elaborated. Example of ANGLE applicability to nuclear forensic signatures will be discussed in more detail. (author)
[en] The HPI2080 neutron rem meter was developed in the 1970’s and was specifically designed for use in pulsed neutron fields. It has recently been upgraded with respect to hardware and firmware both out of necessity (e.g. obsolete components) and the desire to introduce new measurement capabilities. This paper details these upgrades and provides data demonstrating the new operational modes. Additional potential upgrades are also discussed that are designed to further improve the instrument. (author)