Premium
Radium regionalization in California
Author(s) -
Wollenberg H. A.,
Revzan K. L.
Publication year - 1990
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl017i006p00805
Subject(s) - radium , radon , lithology , uranium , geology , radiometric dating , environmental science , mineralogy , geochemistry , radiochemistry , chemistry , physics , materials science , quantum mechanics , metallurgy
The amount of 222 Rn that enters a house depends to a large extent on the concentration of radon's parent, 226 Ra in the soil. With the assumption that radium is in radioactive equilibrium with its ultimate parent, 238 U, we used the National Aerial Radiometric Reconnaisance (NARR) data and a database covering the concentration and distribution of uranium in California rocks to estimate the regional distribution of radium. A north‐to‐south increase in radium occurs between 42° and 36°N, then radium decreases southward. This pattern is explained by the distribution of rock types. The overall mean radium concentrations estimated from the aeroradiometric and lithologic data are similar, but there is a significant discrepancy between aeroradiometric and lithologic‐estimated radium in central California. Ground measurements suggest that the radium values from aeroradiometric measurements there are erroneously high, pointing out the necessity of verifying aeroradio‐metrically‐determined data before they are used to help predict radon production.