The measurement of radiation levels in Australian zircon milling plants.

The processing of zircon often involves grinding it to a fine powder known as zircon flour. As the resulting particles are small they may be inhaled if they become airborne and, since they contain some uranium and thorium, deliver radiation doses to workers. Theoretical estimates and measured radiation exposure in Australian zircon milling plants are reported in this paper. Theoretical doses, calculated in this work, indicate a potential maximum dose to workers of 5.5 mSv y(-1). Measured doses, based on normal work practices, vary in different plants from 0.66 mSv to 1.03 mSv y(-1) and suggest that in the dustiest Australian zircon milling plants the maximum dose would be of the order of 1 mSv y(-1). Measurements, which focused on the dustiest operations, indicate an upper limit of dose of about 3 mSv y(-1). Based on the theoretical and measured doses not exceeding 6 mSv y(-1), workers would not be designated as Category A workers, and probably would not be designated Category B workers, exceeding 1 mSv y(-1), under the guidelines of a EURATOM Directive.

The establishment of a radioactive waste disposal facility in Western Australia for low level waste.

The Radiation Health Section of the Health Department of Western Australia has been a repository for unwanted radioactive sources for many years. They had been placed in the radioactive store located on the Queen Elizabeth II Medical Centre Campus. After a collection period of more than 20 years the storage facilities of the Radiation Health Section were nearing capacity. A decision was made to relocate these sources into a permanent near surface burial facility. Following extensive community consultation and site investigations, waste originating in Western Australia was disposed of at Mt Walton (East), 80 km North East of Koolyanobbing, Western Australia in November 1992.

Evaluation of the 'Best Start' breast-feeding education program.

OBJECTIVE: To compare the frequency of breast-feeding before and after the "Best Start" breast-feeding educational program was implemented. DESIGN: Preintervention-postintervention trial. SETTING: A women's health center and children's hospital serving a low-income population. PATIENTS: Ninety mother-infant pairs of whom the infants were born between January 2 and February 28, 1993, compared with 90 mother-infant pairs of whom the infants were born between January 2 and February 28, 1994. INTERVENTION: Best Start, a breast-feeding education program, was presented to health professionals and clerical staff of the Women's Health Center. At the first prenatal visit, a woman is asked, "What do you know about breast-feeding?" instead of "Are you going to breast-feed or bottle-feed this baby?" The program elicits and acknowledges the mother's concerns and then educates her about the benefits of breast-feeding. This is repeated at each prenatal visit. OUTCOME MEASURES: Sociodemographic data and breast-feeding rates of preintervention groups were compared with those of postintervention groups. Both hospital and out-patient records were reviewed. RESULTS: In 1993, 13 (15%) of 86 mothers breast-fed at hospital discharge compared with 25 (31%) of 81 in 1994 (P < .03). At the 2-week clinic visit, 11 (13%) of 86 were still breast-feeding in 1993 compared with 17 (21%) of 81 in 1994 (P > .20). The impact on mothers aged 19 years or less was particularly marked, with a tripling of the breast-feeding rate at hospital discharge from 11% (2/18) in 1993 to 37% (10/27) in 1994. CONCLUSION: This simple, low-cost educational intervention with a change in the manner of presentation significantly improved the breast-feeding rates of this low-income population.

A patient dose survey for three common diagnostic radiographic examinations using a dose-area product meter.

A patient dose survey was carried out for three common diagnostic radiographic examinations: lumbar spine, abdomen and pelvis. A dose-area product meter was used to determine the dose-area product delivered to the patient. The patient dose results reported in this study are lower than the results of the dose survey for United Kingdom hospitals which was recently published by the National Radiological Protection Board. Our data were also used to calculate the mean energy imparted and the mean effective dose from the examinations.