An Instrument for Bone Mineral Measurement Using a Microprocessor as the Control and Arithmetic Element
We have developed a self-contained instrument for the determination of bone mineral content by photon absorptometry. A high-resolution detection system allows measurements to be made at up to 16 photon energies. Control and arithmetic functions are performed by a microprocessor. Analysis capability and limitations are discussed.
Measurement of Bone Mineral in vivo: An Improved Method
The mineral content of bone can be determined by measuring the absorption by bone of a monochromatic, low-energy photon beam which originates in a radioactive source (iodine-125 at 27.3 kev or americium 241 at 59.6 kev). The intensity of the beam transmitted by the bone is measured by counting with a scintillation detector. Since the photon source and detector are well collimated, errors resulting from scattered radiation are reduced. From measurements of the intensity of the transmitted beam, made at intervals across the bone, the total mineral content of the bone can be determined. The results are accurate and reproducible to within about 3 percent.
Cultural constraints on the delivery of HIV/AIDS prevention in Ireland.
HIV appeared in Ireland following an opiate epidemic in the early 1980s. Initially, however, the gay community mounted the only response to the spread of the virus while the implementation of early actions by the government was hampered by the constructions of the disease within Irish society. This paper considers the influence of the religious hierarchy in both the development of AIDS policy and in the shaping of public perceptions of the disease and those affected. A qualitative methodology is used to examine the role of such cultural constraints in an evaluation of the social context within which the prevention of HIV infection occurs. Three key issues pertinent to the policy context in Ireland are explored in depth. These are the role of the Catholic Church, the influences on health education programmes, particularly information giving, and the development of services and other interventions. These findings are discussed within the social and political contexts in which health policy is formulated.