ENHANCEMENT OF U-234 IN SPRINGWATERS OF AGUAS-DA-PRATA, SAO-PAULO, BRAZIL

Springwater samples were collected at Aguas da Prata, an important spa in São Paulo State, Brazil. The U-238 and U-234 isotopes were evaluated for Platina, Paiol, Villela, Prata-Radioativa, Prata-Nova, Boi, Vitoria, and Prata-Antiga springs. An inverse logarithmic correlation was found between U-234/U-238 activity ratio and Rn-222 content of the studied waters, which was related to different solution mechanisms of Rn-222 and U-234 nuclides at the rock-water interface. A linear correlation also exists between the U-234/U-238 activity ratios of the studied waters and total dissolved solids, ionic strength, CO2 partial pressure, and index of base exchange, which indicates that the enhancement of U-234 in solution increases with the degree of weathering in the aquifers, A higher U-234/U-238 activity ratio was found to be directly related to a higher value of dissolution rate.

Illinois Transportation Enhancement Program : Cycle III /

"October 1994."

Illinois Transportation Enhancement Program /

"ITEP is a three year program. Projects funded through the Illinois Transportation Enhancement Program include: scenic/historic highways; historic transportation structure rehabilitation; pedestrian and bicycle facilities; landscaping; transportation museums; outdoor advertising control."

The National transportation posture study, 1963 : study of the utilization and usable reserve capacity of U.S. transportation systems under pervailing operating practices and traffic patterns /

"Administratively restricted."

Wetland Reserve Program : restoring America's wetlands.

"February 2000"--P. [3] of cover.

Life-cycle costing manual for the Federal Energy Management Program : a guide for evaluating the cost effectiveness of energy conservation and renewable energy projects for new and existing federally owned and leased buildings and facilities /

"Issued originally December 1980 ; revised May 1982 ; revised November 1987."

Making a difference : accomplishments of 1996 Natural Resource Conservation Education Program /

Shipping list no.: 1998-0152-P.

Performance of historic stone building materials and systems : observations by architects, engineers and building conservators : excerpts from workshop discussions held on August 10, 1987, funded by the U.S. Environmental Protection Agency and the U.S. Department of the Interior, National Park Service, Cultural Resources Acid Rain Research Program.

"June 1988."

National Acid Precipitation Assessment Program [microform] : hearing before the Subcommittee on Natural Resources, Agriculture Research, and Environment of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundredth Congress, second session, April 27, 1988.

"No. 125."

Food stamp program : implementation of electronic benefit transfer systems : report to the ranking minority member, Committee on Agriculture, Nutrition, and Forestry, U.S. Senate /

"GAO-02-332."

Sediment toxicity in U.S. coastal waters.

"Donna D. Turgeon ... [et al.]"--P. 1.

Forest Legacy Program national report for 2001.

"January 2002."