+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Measurement of 224Ra and 225Ra activities in natural waters using a radon-in-air monitor

, : Measurement of 224Ra and 225Ra activities in natural waters using a radon-in-air monitor. Environmental Science & Technology 35(23): 4680-4683

We report a simple new technique for measuring low-level radium isotopes (224Ra and 226Ra) in natural waters. The radium present in natural waters is first preconcentrated onto MnO2-coated acrylic fiber (Mn fiber) in a column mode. The radon produced from the adsorbed radium is then circulated through a closed air-loop connected to a commercial radon-in-air monitor. The monitor counts alpha decays of radon daughters (polonium isotopes) which are electrostatically collected onto a silicon semiconductor detector. Count data are collected in energy-specific windows, which eliminate interference and maintain very low backgrounds. Radium-224 is measured immediately after sampling via 220Rn (216Po), and 226Ra is measured via 222Rn 218Po) after a few days of ingrowth of 222Rn. This technique is rapid, simple, and accurate for measurements of low-level 224Ra and 226Ra activities without requiring any wet chemistry. Rapid measurements of short-lived 222Rn and 224Ra, along with long-lived 226Ra, may thus be made in natural waters using a single portable system for environmental monitoring of radioactivity as well as tracing of various geochemical and geophysical processes. The technique could be especially useful for the on-site rapid determination of 224Ra which has recently been found to occur at elevated activities in some groundwater wells.


PMID: 11770771

Other references

Leff, J.; Vaughn, C., 1981: The role of maintenance therapy and relatives' expressed emotion in relapse of schizophrenia: a two-year follow-up. A two-year follow-up study was conducted, mainly from case notes, of patients who had originally taken part in a study of the influence of relatives expressed emotion on schizophrenic relapse. It was found that in the two years following discharge...

Szcześniak, M.; Kubis, A.A., 2006: Influence of selected tensides on the hydrocortisone concentration equilibrium balance in micelles and the dispersing center. The degree of hydrocortisone binding, was investigated by means of equilibrium dialysis in the presence of 1% or 3% micellar solutions of polysorbate 20 and 80. Stabilization of the concentration equilibrium was found in all the cases investigated...

Espanol Echaniz, I.M., 1989: Policies for the development of remote rural communities - a comparative study. The Highlands and Islands of Scotland and eastern Andalusia in Spain. A comparison between development policies operating in the remote areas of the Scottish Highlands and Islands and eastern Andalusia, Spain, is drawn from the similar features and evolution of their social and economic structures such as: (1) the c...

Crowley, S.D.; Tharaux, P-L.; Audoly, L.P.; Coffman, T.M., 2004: Exploring type I angiotensin (AT1) receptor functions through gene targeting. The renin-angiotensin system (RAS) modulates a diverse set of physiological processes including development, blood pressure, renal function and inflammation. The principal effector molecule of this system, angiotensin II, mediates most of these ac...

Volsey, J.J.II, 1999: Simulated heated cigarette. Official Gazette of the United States Patent & Trademark Office Patents 1219(1): 124, Feb 2

ten Donkelaar, H.J.; Wesseling, P.; Lammens, M.; Renier, W.O.; Mullaart, R.A.; Thijssen, H.O., 2001: Development and the developmental disorders of human brain. I. Early development of the cerebrum. The recent discovery of many genes that regulate brain development is revolutionizing our knowledge of neuroembryology and, moreover, our understanding of how gene defects cause human birth defects. The first 8 weeks of the development of the cere...

Brooks, B.A.; Blair, E.M.; Finch, R.; Lant, A.F., 1980: Studies on the mechanism and characteristics of action of a uricosuric diuretic, indacrinone (MK-196). 1 The renal action of indacrinone (MK-196), a phenoxyacetic acid derivative with diuretic and uricosuric properties, has been studied in fifteen male subjects. 2 Increasing single doses of up to 60 mg of oral indacrinone produced a linear increase...

Teteryatnikov, I.A., 1975: Contents of trace elements in grains of spring wheat grown under irrigated conditions and given fertilizers. Irrigation and application of 150 kg N + 120 kg P2O5 + 75 kg K2O/ha to spring wheat increased grain contents of Fe, Mn and Zn and decreased Cu, Co and Mo contents, compared with grain produced without fertilizers under rain-fed conditions.

Pontecorvo, G., 1946: Genetic systems based on heterocaryosis. (Cold Spring Harbor Symposia on Quantitative Biology 1946 : 11). Heterocaryotic genetical systems in the fungi are not based upon caryogamy and meiosis as in heterozygotic systems but on the segregation and recombination of whole nuclei in multinucleate cells The particular genetical problems presented by heter...

Ferrone, S.; Mittal, K.K.; Pellegrino, M.A.; Terasaki, P.I.; Reisfeld, R.A., 1972: Serologic specificity and crossreactivity of soluble HL-A alloantigens. Immunological Communications 1(1): 77-91