Radioactive decay of<sup>232</sup>Th

Saha, Sudeshna; Sahakundu, S. M.

doi:10.1088/0954-3899/15/1/007

J. Phys. G: Nucl. Part. Phys.

1989

DOI: 10.1088/0954-3899/15/1/007

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Radioactive decay of²³²Th

Sudeshna Saha¹,

S. M. Sahakundu²

Abstract: The decay of 232Th has been studied using high-resolution Ge and Si surface barrier detectors. Th was radiochemically purified from its daughter products for a-and yspectroscopic studies. Two y-rays with energies 63.8 and 140.8 keV were assigned to the decay of 232Th. The relative y-ray intensities, total transition intensities and a branchings to the first two excited states of z2xRa due to the a decay of 232Th have been estimated.

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Cited by 4 publications

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“…Murray et al 19 cautioned that an ''unassigned'' Th series radionuclide can interfere with 234 Th measurements at 63.3 keV. Work by Saha and Sahakundu 26 and Roy et al 27 demonstrate the existence of a 232 Th gamma at 63.8 keV with an absolute intensity of 0.26%. This interference from 232 Th is not always trivial, and must be corrected for when analyzing samples high in thorium.…”

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Determining 234Th and 238U in rocks, soils, and sediments via the doublet gamma at 92.5 keV

Kaste

Bostick

Heimsath

2006

Analyst

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Efficient and accurate measurements of uranium (U) and U-series radionuclides in earth's materials are needed to assess its environmental impact, reconstruct geochemical histories, and quantify heat production in the crust. To date, measurements of 234Th and 238U by gamma spectrometry have relied on the quantification of 234Th gamma emissions at approximately 63 keV (absolute intensity = 3.7%) and the (234m)Pa gamma at 1001 keV (absolute intensity = 0.84%). However, use of the 63 keV emissions can be hampered by 232Th interferences and self absorption, and the 1001 keV photon has a very low yield. Here we describe the effective use of the 234Th doublet gamma emission at approximately 92.5 keV (total absolute intensity = 4.8%) for 234Th and 238U measurements. This doublet has been largely ignored because of its proximity to the Th K(alpha1) (93.3 keV) and thus its vulnerability to a Th self-fluorescence interference. We demonstrate that additions of U and 40K to a Th ore sample do not increase the count rate at 92-93 keV above that which would be expected from the associated additions of U and 234Th. We also show that the Th self-fluorescence interference appears to be an anomaly associated only with the analysis of relatively thick (>1 mm) Th minerals, and suggest that fluorescence will not complicate the 92-93 keV region in most environmental samples. A review of decay data reveals that Th K(alpha1) X-rays associated with the decay of 235U and 228Ac can significantly interfere with quantification of the 92.5 keV 234Th doublet. We show that simple experimentally-derived correction factors for these X-rays can be used to accurately determine 234Th using its strongest gammas, resulting in higher count rates and smaller self-absorption corrections relative to the traditional analytical lines. Total 1 sigma analytical error associated with U measurements at 92.5 keV ranged from 1 to 9% and is dominated by the relative size of the 228Ac interference. Detection limits for U in environmental samples using this technique are on the order of 50 ppb.

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mentioning

confidence: 99%

Determining 234Th and 238U in rocks, soils, and sediments via the doublet gamma at 92.5 keV

Kaste

Bostick

Heimsath

2006

Analyst

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show abstract

Surface’s weights of electrodeposited thorium samples determined by alpha spectrometry

Strisovska

Kuruc

Galanda

et al. 2011

J Radioanal Nucl Chem

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Nuclear Data Sheets for A=228

Abusaleem

2014

Nuclear Data Sheets

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Radioactive decay of²³²Th

Cited by 4 publications

References 8 publications

Determining 234Th and 238U in rocks, soils, and sediments via the doublet gamma at 92.5 keV

Determining 234Th and 238U in rocks, soils, and sediments via the doublet gamma at 92.5 keV

Surface’s weights of electrodeposited thorium samples determined by alpha spectrometry

Nuclear Data Sheets for A=228

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Radioactive decay of232Th

Cited by 4 publications

References 8 publications

Determining 234Th and 238U in rocks, soils, and sediments via the doublet gamma at 92.5 keV

Determining 234Th and 238U in rocks, soils, and sediments via the doublet gamma at 92.5 keV

Surface’s weights of electrodeposited thorium samples determined by alpha spectrometry

Nuclear Data Sheets for A=228

Contact Info

Product

Resources

About

Radioactive decay of²³²Th