Browsing by Author "Boldeman, JW"

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    The ANTARES AMS Centre : a status report
    (Cambridge University Press, 2016-07-18) Tuniz, C; Fink, D; Hotchkis, MAC; Jacobsen, GE; Lawson, EM; Smith, AM; Hua, Q; Drewer, P; Lee, P; Levchenko, VA; Bird, R; Boldeman, JW; Barbetti, M; Taylor, G; Head, J
    The ANTARES accelerator mass spectrometry facility at Lucas Heights Research Laboratory is operational and AMS measurements of 14C, 26Al and 36Cl are being carried out routinely. Measurement of 129I recently commenced and capabilities for other long-lived radioisotopes such as 10Be are being established. The overall aim of the facility is to develop advanced programs in Quaternary science, global climate change, biomedicine and nuclear safeguards. © the Department of Geosciences, The University of Arizona
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    The ANTARES AMS Centre at the Lucas Heights Research Laboratories
    (Elsevier, 1994-06-03) Tuniz, C; Fink, D; Hotchkis, MAC; Jacobsen, GE; Lawson, EM; Smith, AM; Bird, JR; Boldeman, JW
    The ANTARES AMS facility at the Lucas Heights Research Laboratories is operational and AMS measurements of 14C and 26Al are performed routinely. Measurement programs for a variety of other long-lived cosmogenic radioisotopes are being implemented on specialised beamlines. The overall aim of the facility is to establish an AMS centre for advanced studies in global change and Quaternary science. Other projects in biomedicine and nuclear safeguards monitoring are also being developed. © 1994 Elsevier B.V.
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    Applied accelerator technology
    (The Institution of Engineers Australia, 1994-05-01) Boldeman, JW
    Applied Accelerator Technology is a rapidly outstanding area of research. A brief description is presented of some of the specific projects that have been carried out at the Australian Nuclear Science and Technology Organization on three particle accelerators: the 10 MV tandem accelerator (ANTARES), 3 MV Van de Graaff accelerator and the 1.3 MV Van de Graaff electron accelerator.
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    The Australian Synchrotron research program
    (Australian Institute of Physics, 1998-04) Garrett, RF; Boldeman, JW
    The Australian Synchrotron Research Program (ASRP) provides Australian researchers with access to state-of-the-art synchrotron radiation research capabilities at two overseas synchrotron light source facilities. These are the Australian National Beamline facility (ANBF) at the Photon Factory, Tsukuba, Japan and the Advanced Photon Source, at the Argonne National Laboratory in Chicago, USA. The ASRP was funded for five years under the Major National Research Facilities program, with ANSTO acting as the managing agent. The member institutions of the ASRP are ANSTO, ANU, CSIRO, Monash University, UNSW, and the University of Melbourne, the University of Queensland and the University of Sydney. The University of Canberra is an associate member.
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    Conceptual design of the small angle scattering beamline at the Australian Synchrotron
    (American Institute of Physics, 2009-01-19) Kirby, N; Boldeman, JW; Gentle, IR; Cookson, DJ
    A high performance small angle and wide angle x‐ray scattering (SAXS/WAXS) beamline is one of the initial suite of beamlines to be built at the 3 GeV Australian Synchrotron. This beamline will be ready for use in 2008, for structural analysis across a wide range of research applications over length scales of ∼ 1 to greater than 5000 Å. The instrument is intended for advanced analysis capabilities only possible using synchrotron radiation, such as time, space and energy resolved analysis, and for weak scattering systems. Photon energies will be readily variable between 5.2 and 20 keV. © 2007 American Institute of Physics.
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    Dating, mass spectrometry and nuclear science: a proposed new facility at Lucas Heights.
    (Australian Atomic Energy Commission, 1984-01) Bird, JR; Airey, PL; Boldeman, JW; Cohen, DD; Duerden, P
    It is proposed that the AAEC install a high-technology, multi-user facility based on an 8 MV tandem accelerator to provide new capabilities in the following fields: (a) Radioisotope dating and ultra-sensitive trace element determination in isotope hydrology, salinity, sedimentology, erosion, actinide transport and materials studies. (b) Physics studies for the development of methods of applying nuclear materials safeguards, the provision of neutron dosimetry standards, measurements of precision data for radiation interactions, and the development of new methods for radioisotope dating. (c) Development of nuclear and ion beam techniques with applications in occupational health, biomedicine, materials modification, industrial problems and other fields. (d) Special requirements for accelerator-based radiocarbon dating of geological and archaeological samples not provided by other laboratories, coordinated by the Australian National University. These primary objectives include collaborative projects with the Bureau of Mineral Resources, Geology and Geophysics (BMR), the NSW Water Resources Commission (NSWWRC) and, under the auspices of the Australian Institute of Nuclear Science Engineering (AINSE), with Australian universities and other advanced educational institutions. Existing inter-regional programs in hydrology and neutron physics would also be served by the proposed facility making possible an expansion in the scope of joint projects with other countries in the SE Asian region.
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    Energy dependence of Vp for 233U, 235U and 239Pu below 5.0 MeV.
    (Australian Atomic Energy Commission, 1971-04) Walsh, RL; Boldeman, JW
    Measurement were made of the energy dependence of Vp for neutron induced fission of 233U from thermal to 2.0 MeV. An analysis has been made of all existing data below 5 MeV for 233U, 235U and 239Pu. It is observed from this analysis that the energy dependence of Vp for all three nuclei may be characterized by a two line dependence in which the change of slope occurs at the pairing energy. The nature of the Vp(En) dependence is explained in terms of the double-humped fission barrier and is consistent with the adiabatic assessment of weak coupling of the collective degrees of freedom at the saddle point to the nuclear degrees of freedom at scission.
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    Environmental monitoring in support of international nuclear safeguards and test ban agreements
    (The Institution of Engineers Australia, 1994-05-01) Boldeman, JW; Tuniz, C
    Long-lived radioisotopes introduced into the environment by tests of nuclear weapons and by the operation of nuclear fuel reprocessing plants can be analysed with ultra-high sensitivity by accelerator mass spectrometry (AMS). Isotopic concentrations of 106 atoms per gram and isotopic ratios of 1 part in 1015 can be detected in milligram samples taken from selected environmental media. ANSTO is setting up specialized beamlines at the ANTARES AMS system for the ultrasensitive analysis of long-lived radioisotopes, such as 129I, produced by nuclear activities and for the direct detection of uranium, plutonium and other actinides. It is believed that these new analytical methods will be valuable in the verification of compliance with the terms of international safeguards and nuclear test ban treaties.
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    Fast neutron flux and spectrum measurements in HIFAR - first supplement - average fission spectrum cross section for Ni58(n.p)Co58
    (Australian Atomic Energy Commission, 1961-10) Boldeman, JW; Nicholson, KP
    The Ni58(n.p)Co58 reaction cross section in a fission spectrum has been re-measured and found to be 102 + 3 millibams.
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    Microspectroscopy beamline at the Australian Synchrotron
    (American Institute of Physics, 2007-01-19) Paterson, DJ; Boldeman, JW; Cohen, DD; Ryan, CG
    This dedicated beamline will provide sub‐micron spatial resolution with the highest flux possible and an energy tuning range of 4.7–25 keV using an in‐vacuum undulator source. It will combine 2D mapping with μ‐XRF, μ‐XANES and μ‐XAFS for elemental and chemical analysis to solve scientific problems that can only be understood using sub‐micron resolutions. The primary beamline design goal is to achieve sub‐micron spatial resolution, 100–200 nm, at energy resolutions approaching 1/10000. This spatial resolution will be achieved without a major compromise to the flux, as the beamline will simultaneously achieve detection sensitivities to sub‐ppm levels. The beamline will have the flexibility to trade‐off one parameter against gains in certain attributes, as dictated by the needs of the application. Fresnel zone plates are intended for the highest resolution applications, while the KB mirrors are shall be used for applications where achromatic focusing and high sensitivity are required. The beamline design will accommodate a diverse range of applications with greatly contrasting sample formats, sample composition and anticipated detector count rates. © 2007 American Institute of Physics.
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    Non-statistical effects in the radioactive capture cross sections of the neodymium isotopes
    (Australian Atomic Energy Commission, 1977-01) Musgrove, ARD; Allen, BJ; Boldeman, JW; Macklin, RL
    The neutron capture cross sections of the stable neodymium isotopes have been measured with high energy resolution in the keV region at the 40 m station of ORELA. Average resonance parameters are extracted for s-wave resonances. Significant positive correlations are found between T0n and Tγ all isotopes. The magnitude of the observed correlation coefficient, particularly for 142Nd (p = 0.9), cannot be explained in terms of valence neutron capture and additional mechanisms are discussed. The average s-wave radiative widths for the odd-A isotopes are markedly greater than for the even-A isotopes, while the p-wave radiative width for 142Nd is considerably less than the s-wave width.
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    Options for an Australian hadron therapy facility
    (Australian Nuclear Science and Technology Organisation, 2012-04-20) Boldeman, JW
    It is believed that a compelling case can be made for the construction of a very high Hadron Research Facility in Australia. Several proposals have been prepared in the past. In all cases, the accelerator on which the facility was based would have had the capability of producing highly precise and controlled proton beams with variable energies between 60 and 250 MeV. One of the previous proposals also suggested a more advanced accelerator system capable of producing, in addition, carbon beams with energies variable from 120 - 430 MeV/amu. This paper considers some options for a possible Australian Facility.
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    Preliminary details of a light ion facility for hadron therapy and research
    (Australian Nuclear Science and Technology Organisation, 2010-03) Boldeman, JW; Banati, RB; Buttner, HG; Cohen, DD; Garrett, RL
    A proposal is being prepared for the construction of high-performance accelerator complex for radiation therapy and research. The accelerator will be capable of producing proton beams between 60 and 250 MeV and carbon beams with energies variable from 120 – 430 MeV/amu. This paper presents some of the background material supporting the proposal. Also included are some of the preliminary technical details of the accelerator complex and the transfer beam lines to the various treatment locations and experimental stations.
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    Prompt neutrons from 236U fission fragments
    (Australian Atomic Energy Commission, 1971-03) Boldeman, JW; Musgrove, ARD; Walsh, RL
    Measurements were made of prompt neutron emission in the thermal neutron fission of 235U. The mean neutron emission per fragment was obtained for particular values of the fragment mass and total kinetic energy. A direct neutron counting method was employed and a comparison made with data from previous experiments of this type.
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    Prompt nubar measurements for thermal neutron fission.
    (Australian Atomic Energy Commission, 1967-03) Boldeman, JW; Dalton, AW
    The number of prompt neutrons (v) produced in the thermal neutron induced fission of U233, U235, Pu239, andPu24l has been determined with high accuracy using the liquid scintillator technique- Measurements were made relative to an assumed value of v = 3.784 for the spontaneous fission of Cf252. The present results are compared with previous measurements.
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    A proposal for the establishment of the Australian Particle Therapy Centre for Advanced Cancer Care
    (Australian Nuclear Science and Technology Organisation, 2014-06) Boldeman, JW
    Australia has been for many years the leading centre for cancer treatment in South East Asia, with a large number of conventional photon radiation therapy facilities distributed throughout the states. However, a new technology for radiotherapy has become widely used in advanced countries, especially for those cancers difficult to treat by conventional photon radiation therapy. These include tumours near critical organs or body structures or those in paediatric patients. This new technology which is based on the use of high energy light ions such as protons or carbon ions is generally referred to as Particle Therapy (sometimes Hadron Therapy) and includes the more limited subgroup, Proton Therapy. This new technology makes use of the more precise and highly controllable characteristics of high energy particles beams that are able to destroy tumours near vital organs, while minimising the dose to healthy tissues. Although this technology provides better outcomes for up to 90% of all tumours, there are in Australia each year 600 cancer sufferers for whom there are no alternatives other than chemotherapy. This technology has been adopted in many countries and at this time more than 110,000 patients have been treated overseas. There are currently 13 operating facilities in the USA with 12 under construction. Germany and Japan each have 5 centres and there are facilities in another 11 countries. Currently, there are no facilities in Australia and thus patients desperately in need of this technology are obliged to seek access to centres overseas at great cost and with limited possibility of access. The seriousness of this situation is especially relevant as cancer has now become the major cause of death in Australia and1 in 2 males and 1 in 3 females will have cancer by the age of 85. The need for a Particle Therapy facility in Australia has been recognised by numerous specialist groups and there has been a number of attempts to obtain the funds to construct such a facility. These have tended to be special interest groups and none was successful. Over the last four years, ANSTO has brought this disparate group of specialists together to form a collaboration (The Australian Particle Therapy Consortium). Following extensive consultation and considerable technical development and in the collaboration, a proposal has emerged for a very high performance facility at a very competitive capital cost. The collaboration members include oncologists, surgeons, paediatricians, accelerator scientists and medical and atomic physicists. The proposed Australian Particle Therapy Facility will cost up to $230 M depending upon the chosen site and option, and can be constructed and commissioned in four years. Operating costs in today's dollars are $22 M. After three years of operation, the number of patients treated in one year will be 1100. There are prospects to increase this number to 2000 as the facility and technology are developed. At this time no site has been selected. it is believed that an independent review should be conducted to evaluate the optimum and most efficient site. Criteria for site selection are included in this document.
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    Resonance neutron capture in the isotopes of titanium
    (Australian Atomic Energy Commission, 1977-06) Allen, BJ; Boldeman, JW; Musgrove, ARD; Macklin, RL
    The neutron capture cross sections of 46,47,48,49,50Ti have been measured from 2.75 to 300 keV with ~0.2 per cent energy resolution. The reduced neutron and radiative widths of the s-wave resonances exhibit correlations which, with the exception of 47Ti, are consistent with the calculated magnitudes of the valence component, assuming that the radiative widths contain an additional uncorrelated part. In 47Ti, a significant correlation is observed for J=3- resonances, although the calculated valence component is small.
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    Status of the x-ray absorption spectroscopy (XAS) beamline at the Australian synchrotron
    (American Institute of Physics, 2007-02-02) Glover, CJ; McKinlay, J; Clift, M; Barg, B; Boldeman, JW; Ridgway, MC; Foran, GJ; Garrett, RL; Lay, PA; Broadbent, A
    We present herein the current status of the X-ray Absorption Spectroscopy (XAS) Beamline at the 3 GeV Australian Synchrotron. The optical design and performance, details of the insertion device (Wiggler), end station capabilities and construction and commissioning timeline are given.
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    Valence neutron capture in iron 54Fe
    (Australian Atomic Energy Commission, 1977-02) Allen, BJ; Musgrove, ARD; Boldeman, JW; Macklin, RL
    The neutron capture cross section of S4Fe has been measured with 0.2 per cent energy resolution from 2.5 to 500 keV. A large and significant correlation is observed between the s-wave reduced neutron widths and the corresponding total radiative widths. The valence model readily accounts for this correlation as well as a large fraction of the s-wave radiative widths.