A simplified method for 226Ra determinations in natural waters

Butts, Jolynn; Todd, James F.; Lerche, I.; Moore, Willard S.; Moore, Dan G.

doi:10.1016/0304-4203(88)90115-6

Cited by 18 publications

(11 citation statements)

References 3 publications

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“…Backgrounds averaged 0.39 cpm. Counting cell efficiencies (75%) were determined by counting air from a sealed glass tube containing a 226Ra standard supported on moist Mn-coated acrylic fibers (Butts et al 1988). The counting cells were equilibrated for at least 3.5 h so that measured counts are the sum of alpha decay from 222Rn and its short-lived daughters, 218Po and 2 1 4 P~.…”

Section: Laboratory Studiesmentioning

confidence: 99%

Oxidation of methane in boreal forest soils: a comparison of seven measures

1992

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Section: Laboratory Studiesmentioning

confidence: 99%

Oxidation of methane in boreal forest soils: a comparison of seven measures

1992

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“…1) Rn from the fiber, (4) the fraction of detector volume relative to the entire system volume, (5) detector efficiency, and (6) number of subsequent decay events related to a previous 222 Rn atom decay. The calculation differs slightly from the calculation for the other two channels as given in Moore and Arnold (1996) Butts et al (1988). The fraction of detector volume relative to total system volume is assumed to be 0.77, following Moore and Arnold (1996).…”

Section: Ra Ormentioning

confidence: 98%

²²⁶Ra determination via the rate of ²²²Rn ingrowth with the Radium Delayed Coincidence Counter (RaDeCC)

Geibert

Rodellas

Annett

et al. 2013

Limnology & Ocean Methods

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We present a new method to determine 226Ra in aqueous environmental samples, based on the rate of ingrowth of 222Rn from 226Ra, using the radium delayed coincidence counter (RaDeCC). We use the same instrument setup that is used for the determination of 223Ra and 224Ra. In contrast to methods published earlier, the approach does not require a modification of the counting equipment, counting separately for 226Ra, or waiting for radioactive equilibrium. We show that the calibration works from as low as 10 dpm (0.166 Bq) per sample, up to more than 1000 dpm (16.7 Bq). Although uncertainties are larger (typically around 10%) than reported uncertainties for γ counting, liquid scintillation, or mass spectrometry at comparable activities, the simple setup, low cost, and robustness of the method make it a useful approach for underway measurements, combinations with short‐lived radium isotopes, or monitoring purposes when limited funding or infrastructure is available.

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“…Key et al (1979) later described a system by which radon can be extracted from water samples, concentrated on a trap held at liquid nitrogen temperatures (or dry ice when used with a charcoal trap), and later transferred to a Lucas cell for measurement by a photo multiplier tube (PMT) and a timer/scaler. Later enhancements were made by several authors to enable precise measurements of 222 Rn, and thus its parent 226 Ra (Butts et al 1988;Mathieu et al 1988). Butts et al (1988) were the first to suggest measuring 222 Rn directly from Mn-fibers with this system, and provided the method by which we measure 226 Ra bound on Mn-fiber via the Rn emanation line.…”

Section: Materials and Proceduresmentioning

confidence: 99%

“…Later enhancements were made by several authors to enable precise measurements of 222 Rn, and thus its parent 226 Ra (Butts et al 1988;Mathieu et al 1988). Butts et al (1988) were the first to suggest measuring 222 Rn directly from Mn-fibers with this system, and provided the method by which we measure 226 Ra bound on Mn-fiber via the Rn emanation line. Before measurement, the radon emanation line is purged with compressed helium while the background of the Lucas cell is counted (60 min).…”

Section: Materials and Proceduresmentioning

confidence: 99%

Comparison of measurement methods for radium‐226 on manganese‐fiber

Peterson

Burnett

Dimova

et al. 2009

Limnology & Ocean Methods

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Acrylic fibers impregnated with MnO 2 (Mn-fiber) have become a valuable tool for concentrating dissolved radium for oceanographic applications. With four naturally-occurring radium isotopes ( Rn. We present a proven, air-tight cartridge design that allows one to use these measurement techniques. We then review the procedures for three radon-based nondestructive measurement techniques for 226 Ra on Mn-fiber (via RAD7, RaDeCC, and Rn emanation line systems) and perform an intercomparison among them, using the standard technique of γ-spectrometry as a reference. We find that all methods statistically agree in terms of measured activity. The Rn emanation line and the RaDeCC systems (both based on Lucas cell counting) provide the lowest measurement uncertainties and minimum detectable activities (MDAs) for a given counting time. The RAD7 technique, on the other hand, offers the advantage of being an automated system, thus requiring minimal user interaction. The standard γ-spectrometry technique, while more time-consuming and sample destructive, has the advantage of providing a simultaneous measurement for 228 Ra.

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A simplified method for 226Ra determinations in natural waters

Cited by 18 publications

References 3 publications

Oxidation of methane in boreal forest soils: a comparison of seven measures

Oxidation of methane in boreal forest soils: a comparison of seven measures

²²⁶Ra determination via the rate of ²²²Rn ingrowth with the Radium Delayed Coincidence Counter (RaDeCC)

Comparison of measurement methods for radium‐226 on manganese‐fiber

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A simplified method for 226Ra determinations in natural waters

Cited by 18 publications

References 3 publications

Oxidation of methane in boreal forest soils: a comparison of seven measures

Oxidation of methane in boreal forest soils: a comparison of seven measures

226Ra determination via the rate of 222Rn ingrowth with the Radium Delayed Coincidence Counter (RaDeCC)

Comparison of measurement methods for radium‐226 on manganese‐fiber

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²²⁶Ra determination via the rate of ²²²Rn ingrowth with the Radium Delayed Coincidence Counter (RaDeCC)