New determination of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">U</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>233</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>specific activity and half-life

Jaffey, A.H.; Flynn, Kian; Bentley, W. C.; Karttunen, J.O.

doi:10.1103/physrevc.9.1991

Cited by 14 publications

(14 citation statements)

References 11 publications

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“…By placing a source of 233 U into a gas cell and stopping the recoils of the alpha decay in buffer gas, an off-line source for 229 Th ions can be realized with the possibility to extract the ions in several charge states. 233 U has a long half-life of 1.6·10 5 years [9] and therefore a source can be manufactured and used without any expected depletion of the material.…”

Section: Introductionmentioning

confidence: 99%

Characterization of 233U alpha recoil sources for 229()Th beam production

Pohjalainen

Moore

Sajavaara

2020

Nuclear Instruments and Methods in Physics Research Section B:

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Radioactive 233 U alpha recoil sources are being considered for the production of a thorium ion source to study the low-energy isomer in 229 Th with high-resolution collinear laser spectroscopy at the IGISOL facility of the University of Jyväskylä. In this work two different 233 U sources have been characterized via alpha and gamma spectroscopy of the decay radiation obtained directly from the sources and from alpha-recoils embedded in implantation foils. These measurements revealed rather low 229 Th recoil efficiencies of only a few percent. Although the low efficiency of one of the two sources can be attributed to its inherent thickness, the low recoil efficiency of the second, thinner source, was unexpected. Rutherford backscattering spectrometry (RBS) was performed to investigate the elemental composition as a function of depth revealing a contamination layer on top of the thin source. The combination of spectroscopic methods proves to be a useful approach in the assessment of alpha recoil source performance in general.

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Section: Introductionmentioning

confidence: 99%

Characterization of 233U alpha recoil sources for 229()Th beam production

Pohjalainen

Moore

Sajavaara

2020

Nuclear Instruments and Methods in Physics Research Section B:

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“…Figure 11 also shows the angles subtended by several of the defined-geometry counters for the standardization of alpha-particle sources. Several defined-geometry counters have been described in the literature [7,9,10,11]. One problem that arises in the use of such counters, especially those with large solid angles, is that the geometry is very dependent upon the position of the source in the counter.…”

Section: 8πα Scintillation Countermentioning

confidence: 99%

“…As a result most [9,10], but not all [7,11], counters of this type are operated with the chamber under vacuum and with a solid scintillator as the alpha-particle detector. A question that always arises is, "What is the intrinsic detection efficiency of the solid scintillator?"…”

Section: 8πα Scintillation Countermentioning

confidence: 99%

NIST measurement services :

Hutchinson¹

2004

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“…Excerpted from Lucas [4], Several def ined-geometry counters have been described 1n the literature [9][10][11][12], One problem that arises in the use of such counters, especially those with large solid angles, is that the geometry is very dependent upon the position of the source in the counter, A very clever design for a highgeometry counter that almost eliminates such position dependence over a wide range of horizontal and vertical displacements of the source was described by Robinson [10] and is shown in Fig. 6.…”

Section: Schematic Of Ostt Def I Ned-sol Id-angl E Alpha Countermentioning

confidence: 99%

“…As a result most [10,11], but not all [9,12], counters of this type are operated with the chamber under vacuum and with a solid scintillator as the alpha-particle detector, A question that always arises is, "What is the detection efficiency of the solid scintillator?" Our results at NBS indicate that the alphaparticle-detection efficiencies of our commercially prepared inorganic scintillation crystals [cesium iodide (thallium) and calcium fluoride (europium)] and organic scintillation plastics are at least 0.999.…”

Section: Schematic Of Ostt Def I Ned-sol Id-angl E Alpha Countermentioning

confidence: 99%

Alpha-particle calibrations

Hutchinson¹

1987

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The calibration and related measurement services of the National Bureau of Standards are intended to assist the makers and users of precision measuring instruments in achieving the highest possible levels of accuracy, quality, and productivity. NBS offers over 300 different calibration, special test, and measurement assurance services. These services allow customers to directly link their measurement systems to measurement systems and standards maintained by NBS. These services are offered to the public and private organizations alike. They are described in NBS Special Publication (SP) 250, NBS Calibration Services Users Guide. .

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New determination of theU233specific activity and half-life

Cited by 14 publications

References 11 publications

Characterization of 233U alpha recoil sources for 229()Th beam production

Characterization of 233U alpha recoil sources for 229()Th beam production

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Alpha-particle calibrations

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