Method design and validation for the determination of uranium levels in human urine using high-resolution alpha spectrometry

Quantification of uranium in human urine is a valuable technique for assessing occupational and public exposure to uranium. A reliable method has been developed and validated in the ARPANSA Radiochemistry Laboratory by means of standard radiochemical separation and purification techniques and measurement using high-resolution alpha spectrometry. This method can be used to evaluate the levels of naturally occurring ²³⁴U, ²³⁵U and ²³⁸U in urine. Method design and validation is the process of defining an analytical requirement, and then confirming that the method under consideration has performance capabilities consistent with what the application requires. The method was designed to measure levels down to 2 mBq/day of total uranium, corresponding to approximately 1/100th of the annual committed effective dose of 20 mSv. Validation tests were developed to assess selectivity, accuracy, recovery and quantification of uncertainty. The radiochemical recovery of this method was measured using ²³²U tracer. The typical minimum detectable concentration for total uranium for 24-h urine samples is approximately 0.6 mBq/day or 0.019 μg/day.

Use of high resolution digital multi-spectral imagery to assess the distribution of disease caused by Phytophthora cinnamomi on heathland at Anglesea, Victoria

Disease caused by the soilborne plant pathogen Phytophthora cinnamomi causes long-term floristic and structural changes in native vegetation communities in Australia. Key components of the management of this disease are to know where it occurs and the rate at which it spreads. The distribution of P. cinnamomi has generally been assessed as locality points of infestation and mapping the extent of diseased vegetation in any area is difficult and costly. This study was undertaken in P. cinnamomi-infested heathland communities in southern Victoria, Australia, where the symptoms of P. cinnamomi arise as a mosaic within healthy vegetation. We investigated the potential to improve the efficiency and effectiveness of mapping and monitoring vegetation affected by P. cinnamomi using digital multi-spectral imaging. This technique was developed for the purposes of monitoring vegetation and provides a single, seamless ortho-rectified digital image over the total area of interest. It is used to spatially quantify small differences in the characteristics of vegetation. In this study, the symptoms of disease caused by P. cinnamomi infestation were related to differences in the imagery and were used to map areas of infestation. Comparison of the digital multi-spectral imaging indications with on-ground observations gave moderate accuracy between the datasets (κ = 0.49) for disease and healthy indications. This study demonstrates the ability of the technique to determine disease extent over broad areas in native vegetation and provides a non-invasive, cost effective tool for management.

Civil war, conflict resolution and culture in Lebanon and Algeria

This thesis examined the explanatory capacity of political culture in relation to civil war and conflict resolution in Lebanon and Algeria. It argued that political culture operates to affect the form and legitimacy of peace agreements by employing a method of content analysis that emphasised 'contextuality' in resolution processes.

Child focused and child inclusive family law dispute resolution : one year findings from a prospective study of outcomes

This prospective study compared outcomes over 1 year for two groups of separated parents, who attended mediation about their entrenched parenting disputes. The two treatments studied both aimed to improve the psychological resolution of parental conflict with associated reduction of distress for their children. The Child Focused intervention prioritised thought about the needs of children in high conflict divorce, but without any direct involvement of the children, while the Child Inclusive intervention incorporated separate consultation by a specialist with the children in each family, and consideration of their concerns with parents in the mediation forum. Measures were collected from parents and children prior to mediation commencing, and again three and twelve months after the conclusion of mediation. Significant and enduring reduction in levels of conflict and improved management of disputes occurred for both treatment groups in the year after mediation. Across all ages, children in both interventions perceived less frequent and intense conflict between their parents and better resolution of it, with a significant lowering of their related distress. The Child Inclusive intervention showed a number of independent effects not evident in the other treatment group, related to relationship improvements and psychological wellbeing. These effects were strongest for fathers and children. Agreements reached by the Child Inclusive group were significantly more durable and workable over the year, and these parents were half as likely to instigate new litigation over parenting matters in the year after mediation than were the Child Focused parents. The article considers possible mechanisms of change underpinning these outcomes.

Incorporating fairness into development of an integrated multi-agent online dispute resolution environment

The paper describes the development of an integrated multi-agent online dispute resolution environment called IMODRE that was designed to assist parties involved in Australian family law disputes achieve legally fairer negotiated outcomes. The system extends our previous work in developing negotiation support systems Family_Winner and AssetDivider. In this environment one agent uses a Bayesian Belief Network expertly modeled with knowledge of the Australian Family Law domain to advise disputants of their Best Alternatives to Negotiated Agreements. Another agent incorporates the percentage split of marital property into an integrative bargaining process and applies heuristics and game theory to equitably distribute marital property assets and facilitate further trade-offs. We use this system to add greater fairness to Family property law negotiations.