Browsing by Author "Petersen, MCE"
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- ItemAn apparatus for measuring the energy and angular distribution of electrons ejected in ion-atom collisions(Australian Atomic Energy Commission, 1978-07) Gibson, DK; Petersen, MCEThere is a need for further data on the energy and angular distribution of electrons ejected from atoms and molecules by ion impact. An apparatus in which simultaneous measurements can be made of the energy and angular distributions of such electrons is described. The advantages of the apparatus are the possibility of fast data collection and the ability to make measurements over the whole range of scattering angle. Preliminary tests and a trial measurement with the apparatus are described.
- ItemThe distribution of adsorbing and non-adsorbing solutes in wide rivers.(Australian Atomic Energy Commission, 1977-11) Petersen, MCESolutions are given to the complete two-dimensional transport equations for the distribution of both adsorbing and non-adsorbing solutes released from a continuous point source into a wide river flowing with uniform velocity and with constant anisotropic turbulent diffusion coefficients. These results contain the asymptotic Gaussian expressions often used to describe the far field distributions. The present results allow the near field distributions to be evaluated in situations where complex source distributions occur which do not substantially alter the turbulent diffusion coefficients. Several simple formulae are presented for the non-adsorbing case; these give the length, breadth and area of a plume contour associated with a particular concentration reference level.
- ItemHIFAR safety analysis: frequency and offsite consequences of fault sequences initiated by within-plant failures(Australian Atomic Energy Commission, 1986-05) McCulloch, DB; Corran, ER; Petersen, MCE; Nicholson, FD; Innes, RWHIFAR fault sequences, initiated by failures of within-plant equipment and operational procedures, are analysed using probabilistic methods, and their frequencies estimated. Sequence consequences are estimated in terms of potential radiation doses to an individual at 1.6 km radius from the reactor, expressed in terms of emergency reference levels recommended by the National Health and Medical Research Council for consideration of limited evacuation. The results show that the public risk from all such sequences is extremely low.
- ItemRevised radioactive airborne effluent discharge limit for the Lucas Heights Research Laboratories(Australian Nuclear Science and Technology Organisation, 1989-09) Petersen, MCE; Clark, GH; Bailey, GM; May, FGThe Australian Nuclear Science and Technology Organisation, formerly the Australian Atomic Energy Commission, is authorised under the NSW Radioactive Substances Act to release limited quantities of radioactive airborne effluent into the atmosphere from its facilities at the Lucas Heights Research Laboratories (LHRL). This authorisation is about twenty years old. This report proposes a revised site-wide airborne effluent discharge limit for the LHRL. The revised discharge limit is based upon the panoply of current International Commission on Radiological Protection (ICRP) and National Health Medical Research Council (NH & MRC) recommendations. It takes account of the operational changes at the LHRL and developments in radiation dosimetry and meteorology. The development and technical basis of the revised discharge limit, together with its relation to the ICRP recommendations, is briefly given. The formal discharge limit is to be approved by the NSW Radiological Advisory Council. The discharge limit consists of three components. First, a definition of the discharge limit expressed in terms of a fraction of the recommended ICRP dose limits. This limit is supported by, second, a compliance procedure and, third, a reporting procedure. In addition to the revised discharge limit, a number of operational and safety measures have to be further developed under the direction of ANSTO Management. The development of 'reference' levels' recommended by the ICRP is briefly described. In the present context, two reference levels for the quantities of activity released from each source will be established. The levels operate effectively like quality control measures in industry. They require certain operator actions if they are exceeded. The doses to individuals which are estimated for releases at the reference levels of releases of activity are well within the revised dose limits. From an operational point of view, these levels will vary with changing operations.