Nuclear data sheets update for A = 210

Browne, E.

doi:10.1016/0090-3752(92)80007-7

Cited by 21 publications

(5 citation statements)

References 225 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The only observed α-emitting impurity, based on a total cumulative counting time exceeding 1.6×10 6 s (≈19 d), was 208 Po whose principal α ( I α = 0.999982±0.000002) has an energy of E α = (5.1152±0.0015) MeV [ 11 ]. There was no evidence of 210 Po presence [E α = (5.30438±0.00007) MeV; I α = 1.00] [ 26 , 27 ] which is unsurprising because of its substantially shorter half-life (T = 138.4 d) and age of the 209 Po stock material. Detection of these two most likely polonium isotope impurities is greatly facilitated in that their principal α transitions have energies greater than that for 209 Po.…”

Section: Methods Results and Discussionmentioning

confidence: 99%

Preparation and Calibration of Carrier-Free Po-209 Solution Standards

Collé

Lin

Schima

et al. 1995

J. Res. Natl. Inst. Stand. Technol.

View full text Add to dashboard Cite

Carrier-free 209Po solution standards have been prepared and calibrated. The standards, which will be disseminated by the National Institute of Standards and Technology as Standard Reference Material SRM 4326, consist of (5.1597 ±0.0024) g of a solution of polonium in nominal 2 mol · L−1 hydrochloric acid (having a solution density of (1.031±0.004) g · mL−1 at 22 °C) that is contained in 5 mL flame-sealed borosilicate glass ampoules, and are certified to contain a 209Po alpha-particle emission rate concentration of (85.42±0.29) s−1 · g−1 (corresponding to a 209Po activity concentration of (85.83 ±0.30) Bq · g−1) as of the reference time of 1200 EST 15 March 1994. The calibration was based on 4πα liquid scintillation (LS) measurements with two different LS counting systems and under wide variations in measurement and sample conditions. Confirmatory measurements by 2πα gas-flow proportional counting were also performed. The only known radionuclidic impurity, based on α- and photon-emission spectrometry, is a trace quantity of 208Po. The 208Po to 209Po impurity ratio as of the reference time was 0.00124 ±0.00020. All of the above cited uncertainty intervals correspond to a combined standard uncertainty multiplied by a coverage factor of k = 2. Although 209Po is nearly a pure α emitter with only a weak electron capture branch to 209Bi, LS measurements of the 209Po a decay are confounded by an a transition to a 2.3 keV (Jπ= 1/2−) level in 205Pb which was previously unknown to be a delayed isomeric state.

show abstract

Section: Methods Results and Discussionmentioning

confidence: 99%

Preparation and Calibration of Carrier-Free Po-209 Solution Standards

Collé

Lin

Schima

et al. 1995

J. Res. Natl. Inst. Stand. Technol.

View full text Add to dashboard Cite

show abstract

“…with i = S, V, A, T, P 6 and k v is the angular momentmn 4 In the case of maximum violation of parity, real coupling constants and no S-and T-admixture, they are defined as in many earlier papers, see for example [22,37,38] 5 An update of the experimental data is given by Browne [36] 6 As we showed in [24] the pseudo-scalar form factor coefficients are relativistic ones. For our calculations they have been neglected…”

Section: M}c(kekv) and Mk(ke Kv) mentioning

confidence: 99%

Effects of (V+A)-, S-, T-interaction admixtures and of a time reversal invariance violation on the first-forbidden beta-decay of RaE

Sadler

Behrens

1994

Z. Physik A - Hadrons and Nuclei

View full text Add to dashboard Cite

Abstract.The shape factor and the electron longitudinal polarization of RaE have been calculated under the assumption of (V+ A)-, S-, T-interaction admixtures. In addition the influence of a time reversal invariance violation has been considered. It is shown that the effect of (V+ A) admixtures on the electron longitudinal polarization is enhanced by two orders of magnitude compared to the case of allowed transitions. Such an effect is also observed for the shape factor. It is also demonstrated that a time reversal invariance violation also affects the observables mentioned above.

show abstract

“…Generation and isolation of BiH 3 for /?-spectrometric assay As BiH 3 is highly unstable [12], its preparation and eventual isolation must take place over as short a path as possible, i.e., the apparatus must be as compact as is practicable, and surface areas (upon which decomposition of BiH 3 may occur) should be minimized. At the same time, the reaction cell must be of sufficient size such that any foam or spray (which might contain interfering activities) originating from the sample solution does not contaminate the medium upon which the BiH 3 is to be trapped.…”

Section: Chemical Proceduresmentioning

confidence: 99%

“…However, 210 Pb emits only one 7-ray, at 46.5 keV, with an absolute intensity of 4.25% [3], This extremely low y-ray energy means that considerable self-absorption in the sample matrix as well as absorption in the detector cladding takes place, significantly reducing the counting rate, and often necessitating very large and usually uncertain corrections. Also, as self-absorption in the sample matrix is highly Z-dependent for low yenergies, it can vary appreciably with sample elemental composition.…”

Section: Introductionmentioning

confidence: 99%

Determination of ²¹⁰Pb via ²¹⁰Bi Using a Hydride Generation Technique Combined with β-Spectrometry

et al. 1996

View full text Add to dashboard Cite

A procedure for the determination of 2 '°Pb is presented, which is based upon the /?-spectrometric assay (utilizing a liquid-scintillation counter) of 2,ü Bi in radioactive equilibrium. Separation of 210 Bi from the sample matrix as well as from other /^-emitters is achieved quickly, simply and selectively using a purge and trap technique based upon the generation and subsequent absorption of BiH 3 on a prepared filter paper. Advantages of this method include: 1) radioactive equilibrium between 2,0 Pb and 210 Bi is relatively quickly attained; 2) the external background signal in liquid-scintillation counting is very low; 3) no quenching corrections are necessary, as the sample matrix is invariant; and 4) because of the high counting efficiency, only short measuring times are required.

show abstract

Nuclear data sheets update for A = 210

Cited by 21 publications

References 225 publications

Preparation and Calibration of Carrier-Free Po-209 Solution Standards

Preparation and Calibration of Carrier-Free Po-209 Solution Standards

Effects of (V+A)-, S-, T-interaction admixtures and of a time reversal invariance violation on the first-forbidden beta-decay of RaE

Determination of ²¹⁰Pb via ²¹⁰Bi Using a Hydride Generation Technique Combined with β-Spectrometry

Contact Info

Product

Resources

About

Nuclear data sheets update for A = 210

Cited by 21 publications

References 225 publications

Preparation and Calibration of Carrier-Free Po-209 Solution Standards

Preparation and Calibration of Carrier-Free Po-209 Solution Standards

Effects of (V+A)-, S-, T-interaction admixtures and of a time reversal invariance violation on the first-forbidden beta-decay of RaE

Determination of 210Pb via 210Bi Using a Hydride Generation Technique Combined with β-Spectrometry

Contact Info

Product

Resources

About

Determination of ²¹⁰Pb via ²¹⁰Bi Using a Hydride Generation Technique Combined with β-Spectrometry