[en] Most of active rock samples from Lampung are granites and pegmatite granites. Result of petrographic studies are given, followed by a discussion stressed on their compositions related to their radioactivities. (author)

[en] Distribution of zircon minerals in rock are controlled by their acidity. Acid rocks content more zircon minerals, an another side they content less apatite minerals. This distribution can be found in Way Pubian granit area-Lampung. (author)

[en] BATAN, started out as a governmental committee established in 1954, has a new organizational structure, based on Presidential Decree of 1998. BATAN has developed its researches in almost practically all-nuclear fields. The situation in Indonesia has been much influenced by the economic crisis, which still being faced by Indonesia. BATAN's strategic planning is described in four areas, those are: 1. Basic human needs, 2. Energy, natural resources and environment, 3. Industry, 4. Socio-cultural and institution. Priority has been given to fulfill, as well as to promote agriculture, health and the industry related to people's welfare, which may develop and improve the immediate needs of the people. In the meantime, we have made considerable investments in manpower development in anticipation of the introduction of nuclear power. BATAN, as of September 1999, has 3889 employees, 26 % of them have bachelor degree, 6 % hold master degrees, and only 2% hold doctoral degree, a total of 34 % employees with university education. Others 11 % have either non-vocational or vocational education beyond High School. The rest of 55 % have high school education or lower, they are administrative clerks (25 %) or technicians (30 %). In the human resources development, BATAN's Education and Training Center, in collaboration with some universities and other national/international institutions, is managing education and training programs for employees. To date, there are 43 BATAN employees studying in various universities in Japan, while another 42 employees are studying in six different countries. Research and Development that have more direct impact to the community will become a priority in the coming years. Without undermining the importance of basic research in advanced fields, we will expect to have more research on application to optimize utilization of research reactors and related facilities for the benefit of both the energy and non-energy sectors. (Tanaka, Y.)

[en] The history of the search for uranium and allied materials is summarized, followed by a discussion on methods used. A brief orogenic history on which the exploration was based in the past, is also given. (author)

[en] A reconnaissance drainage survey has been carried out in central and southern Sumatra, primarily for uranium, but also encompassing several base metals. An area of 40.000 km2 has been covered in less than eleven months field work at a cost of less than $1 per square kilometre, using a combination of traditional geochemical methods and the rather less common heavy mineral panned concentrate as sampling medium, followed by tetrabromoethane separation in the laboratory. The results indicate an enhancement of contrast of the heavy mineral separates, as compared to the corresponding ordinary stream sediments. The phenomenon is evident for most of the elements, including the primary target, uranium. It is suggested that Fe and Mn hydroxide coprecipitation of elements is the dominant dispersion process, as opposed to adsorption on clays, and that the dominant means of dispersion will be mechanical, rather than chemical, once the solution transporting the element is exposed to the atmosphere. Several areas have been delineated as worthy of follow-up and this work is proceeding. The importance of such rapid, cheap reconnaissance for the developing countries is underlined. The work can be carried out using semi-skilled field pernosonnel with junior geologist in supervision. One senior qualified project manager is required to coordinante movements, data processing, and sample treatment. (author)