| Autor: |
Litt, Barbara R., Korn, Leo R., Moser, Fredrika C., Bell, Christy, Clare, April K., Uptegrove, Jane, Key, Robert M. |
| Rok vydání: |
1992 |
| DOI: |
10.7282/t3t153bh |
| Popis: |
Ground water radon concentrations were determined in three types of Middle Proterozoic rocks in the New Jersey Highlands. The rock types (hornblende granite, quartz-oligoclase gneiss, and pyroxene granite) were selected because of their suspected uranium contents (high, low, and low, respectively). It was hypothesized that high ground water radon concentrations might be associated with uranium-bearing rock units. Radon concentrations in 154 wells ranged from 36 pCi/L to 24,000 pci/L (picocuries per liter) with a geometric mean and a median of 1600 pci/L. Radon levels were greater than 300 pci/L (USEPA's proposed MCL for radon in drinking water) in 90% of the wells. None of the rock units studied had ground water radon levels consistently low enough to be regarded as a low priority for testing. Local mineralogy and structure were found to influence ground water radon concentrations. In highly deformed rock units, such as those in the New Jersey Highlands, there is considerable heterogeneity. Migmatites, alaskites and pegmatites which may not appear on a geologic quadrangle map due to their small size or because they are not exposed can affect radioactivity on a local scale. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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