Selected gamma-ray energies and emission probabilities for the decay of 125Sb and 154Eu

doi:10.1016/0883-2889(90)90133-2

International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes

Volume 41, Issue 1, 1990, Pages 75-81

https://doi.org/10.1016/0883-2889(90)90133-2 Get rights and content

Abstract

The energies of 17 γ rays from ¹²⁵Sb and 35 from ¹⁵⁴Eu have been determined with typical uncertainties of 5–10 eV. Relative γ-ray emission rates have also been measured for 16 γ rays from ¹²⁵Sb and 24 from ¹⁵⁴Eu. These data will make more useful the mixed standard of ¹²⁵Sb, ¹⁵⁴Eu and ¹⁵⁵Eu that is often used to calibrate Ge γ-ray detectors.

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Evaluation of the 125Sb nuclear decay data
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Citation Excerpt :
The experimental and recommended γ-ray relative intensities from 125Sb β− decay are listed in Table 3. The measured γ-ray relative intensities have been reported by Andreev et al. [23], Sergolle [24], Charalambus et al. [19], Nagpal et al. [20], Gupta et al.[21], Ila et al. [25], Walters et al. [14], Ardisson et al. [26], Gehrke et al. [27], Prasad [28], Roney et al. [29], Singh et al. [30], Iwata et al. [31], Wang et al. [32], Longoria-Gandara [33], Helmer [15], Meyer [16], Schotzig et al. [34], Smith et al. [35], Fawwaz et al. [36] and Sainath et al. [17]. The uncertainty of the measured value in Sergolle [24] is not given.
Evaluation of the complete decay scheme and data for ¹²⁵Sb/^125mTe decay to nuclear levels in ¹²⁵Te is presented in this report; literature data available up to June 2015 are included. The Limitation of Relative Statistical Weight Method (LRSW) was applied to average numbers throughout the evaluation. The uncertainty assigned to the average value was always greater than or equal to the smallest uncertainty of the values used to calculate the average. The half-life has been determined to be 1007.4±0.3 days. All known measured γ-ray absolute or relative intensities have been examined; the γ-ray emission probability of the reference γ-ray line of 427.874 keV is recommended to be 29.54±0.10%. The theoretical internal conversion coefficients and their uncertainties were used to obtain the complete decay scheme intensity balance. The values of other decay characteristics were calculated using the ENSDF analysis program. Finally the updated decay scheme for ¹²⁵Sb is presented.
Beta decay of the fission product 125Sb and a new complete evaluation of absolute gamma ray transition intensities
2012, Radiation Physics and Chemistry
Citation Excerpt :
In earlier studies, Longoria-Gandara et al. (1990) had pointed out discrepancies in the data of the isotope and adopted an arbitrary inflation of uncertainties method for the evaluation. Later some new sets of experimental measurements of the isotopes were published (Helmer, 1990; Smith et al., 1992; Fawaz and Stewart, 1993; Sainath et al., 1998) and few new evaluation methodologies (described later) were proposed. The availability of these methodologies and later measurements motivated the present evaluation of the relative intensities.
The radionuclide ¹²⁵Sb is a long-lived fission product, which decays to ¹²⁵Te by negative beta emission with a half-life of 1008 day. The beta decay is followed by the emission of several gamma radiations, ranging from low to medium energy, that can suitably be used for high-resolution detector calibrations, decay heat calculations and in many other applications. In this work, the beta decay of ¹²⁵Sb has been studied in detail. The complete published experimental data of relative gamma ray intensities in the beta decay of the radionuclide ¹²⁵Sb has been compiled. The consistency analysis was performed and discrepancies found at several gamma ray energies. Evaluation of the discrepant data was carried out using Normalized Residual and RAJEVAL methods. The decay scheme balance was carried out using beta branching ratios, internal conversion coefficients, populating and depopulating gamma transitions to ¹²⁵Te levels. The work has resulted in the consistent conversion factor equal to 29.59(13) %, and determined a new evaluated set of the absolute gamma ray emission probabilities. The work has also shown 22.99% of the delayed intensity fraction as outgoing from the 58 d isomeric 144 keV energy level and 77.01% of the prompt intensity fraction reaching to the ground state from the other excited states. The results are discussed and compared with previous evaluations. The present work includes additional experimental data sets which were not included in the previous evaluations. A new set of recommended relative and absolute gamma ray emission probabilities is presented.
Nuclear Data Sheets for A = 125
2011, Nuclear Data Sheets
Nuclear Data Sheets for A = 154
2009, Nuclear Data Sheets
Precision measurements in 124Te following the decay of 124Sb
2006, Applied Radiation and Isotopes
The decay of ¹²⁴Sb (60 d half-life) to levels of ¹²⁴Te has been studied using two HPGe detectors in singles and coincidence mode. We identify 75 transitions in this decay, including 14 gamma rays, the emission of which are being reported here for the first time. In confirming the existence of 26 well-established levels below 2900 keV excitation, we also introduce 5 other levels at 2490.5, 2618.4, 2747.05, 2834.99, and 2859.4 keV. The data on energies of gamma transitions and the levels are reported at high precision.
Study of XK and γ photon emission following decay of 154Eu
2004, Applied Radiation and Isotopes
A joint project has been established between VNIIM (D.I. Mendeleyev Institute for Metrology) and LNHB (Laboratoire National Henri Becquerel) to determine as accurately as possible the X- and γ-ray emission probabilities of ¹⁵⁴Eu. Point sources were prepared by VNIIM, and absolute measurements of activity per unit mass were undertaken by both laboratories using coincidence, anti-coincidence and 4π–γ counting methods. Other point sources and one aliquot were also prepared for precise γ-ray spectrometry measurements. Absolute photon emission probabilities were determined with a maximum uncertainty of 0.5% for the most intense lines, supporting the development of this nuclide as a multigamma standard.

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International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes

Abstract

References (11)

Nucl. Instrum. Methods

Nucl. Instrum. Methods

Nucl. Instrum. Methods

Nucl. Data Sheets

Nucl. Instrum. Methods

Cited by (17)

Evaluation of the <sup>125</sup>Sb nuclear decay data

Beta decay of the fission product <sup>125</sup>Sb and a new complete evaluation of absolute gamma ray transition intensities

Nuclear Data Sheets for A = 125

Nuclear Data Sheets for A = 154

Precision measurements in <sup>124</sup>Te following the decay of <sup>124</sup>Sb

Study of XK and γ photon emission following decay of <sup>154</sup>Eu