Decay data of radionuclide <sup>56</sup>Co for high-energy gamma efficiency calibration of detectors

TIAN Ronghe; YANG Dong; YU Weixiang; HUANG Xiaolong; LI Xiaoan; SHI Mingsong

doi:10.7498/aps.74.20250743

Abstract

⁵⁶Co, with γ-ray energies covering the ranging from 0.84–3.55 MeV, is an important radionuclide for calibrating Ge detector. Based on the main measurements of D. C. Camp et al. (Camp D C, Meredith G L 1971 Nucl. Phys. A 166 349) and M. E. Phelps et al (Phelps M, Sarantites D, Winn W 1970 Nucl. Phys. A 149 647). before 2000, the probability of γ-ray emission is evaluated and recommended. The values reported by D. C. Camp, however, are systematically lower in high energy range. In this work, using the experimental measurements obtained from the Nuclear Science Reference Library, the main decay data, such as half-life and γ-ray emission probabilities, are evaluated and summarized. In the E_γ< 2.5 MeV energy region, the new evaluation data in this work are in good agreement with the results of the ENSDF evaluation (Huo J, Huo S, Yang D 2011 Nucl. Data Sheets 112 1513) and the summary report published by IAEA in 1991 (). However, in the high-energy region, i.e., in the E_γ> 2.5 MeV energy region, the present work gives lower values than the other evaluation data. The deviation at 3.4 MeV is as high as 2.7%. Rationality of the present evaluation and corrected method will be dependent on new measurements, and more precise standard data are desirable. The datasets presented in this paper, including the ENDF and ENSDF format decay data files for ⁵⁶Co, may be available at https://doi.org/10.57760/sciencedb.j00213.00169.

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Authors and contacts

Corresponding author: YANG Dong, dyang@jlu.edu.cn

Funds: Project supported by the National Key R&D Program of China (Grant No. 2022YFA1602000).

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辐射类型	能量/keV	绝对强度/% (本工作)	绝对强度/% (ENSDF)	绝对强度/% (IAEA)
半衰期		77.245(28) d	77.236(26) d	77.236(26) d
γ₁	263.41(10)	0.023(2)	0.0220(3)
γ₂	411.38(8)	0.0254(25)	0.024(3)
γ₃	486.54(11)	0.057(5)	0.0540(20)
γ₄	655.0(8)	0.043(5)	0.043(4)
γ₅	674.7(8)	0.031(5)	0.024(3)
γ₆	733.5085(23)	0.191(4)	0.191(3)
γ₇	787.7391(23)	0.310(5)	0.311(3)
γ₈	846.7638(19)	99.9417(32)	99.9399(23)	99.9399(23)
γ₉	852.78(5)	0.049(3)	0.049(3)
γ₁₀	896.503(7)	0.071(4)	0.073(3)
γ₁₁	977.363(4)	1.422(7)	1.421(6)	1.422(7)
γ₁₂	996.939(5)	0.113(4)	0.111(4)
γ₁₃	1037.8333(24)	14.06(5)	14.05(4)	14.03(5)
γ₁₄	1089.03(24)	0.054(7)	0.055(4)
γ₁₅	1140.356(7)	0.1329(30)	0.132(3)
γ₁₆	1159.933(8)	0.091(5)	0.094(6)
γ₁₇	1175.0878(22)	2.254(7)	2.252(6)	2.249(9)
γ₁₈	1198.78(20)	0.047(5)	0.049(5)
γ₁₉	1238.2736(22)	66.41(17)	66.46(12)	66.41(16)
γ₂₀	1272.2(6)	0.0195(10)	0.0200(7)
γ₂₁	1335.380(29)	0.1219(30)	0.1224(12)
γ₂₂	1360.196(4)	4.280(21)	4.283(12)	4.280(13)
γ₂₃	1442.75(8)	0.180(4)	0.180(4)
γ₂₄	1462.34(12)	0.0777(11)	0.074(4)
γ₂₅	1640.450(5)	0.0616(30)	0.0616(19)
γ₂₆	1771.327(3)	15.43(4)	15.41(6)	15.45(4)
γ₂₇	1810.726(4)	0.640(5)	0.640(3)
γ₂₈	1963.703(11)	0.7036(30)	0.707(4)
γ₂₉	2015.176(5)	3.018(15)	3.016(12)	3.017(14)
γ₃₀	2034.752(5)	7.749(20)	7.77(3)	7.741(13)
γ₃₁	2113.092(6)	0.376(4)	0.377(3)
γ₃₂	2212.898(3)	0.388(4)	0.388(4)
γ₃₃	2276.36(16)	0.119(5)	0.118(4)
γ₃₄	2373.7(4)	0.081(6)	0.080(4)
γ₃₅	2523.0(8)	0.061(5)	0.059(4)
γ₃₆	2598.438(4)	16.76(8)	16.97(4)	16.96(4)
γ₃₇	2657.4(8)	0.019(3)	0.0190(17)
γ₃₈	3009.559(4)	1.027(12)	1.036(13)	1.038(19)
γ₃₉	3201.930(11)	3.176(18)	3.209(12)	3.203(13)
γ₄₀	3253.402(5)	7.656(30)	7.923(21)	7.87(3)
γ₄₁	3272.978(6)	1.810(14)	1.8759(20)	1.855(9)
γ₄₂	3369.69(30)	0.0097(10)	0.0101(7)
γ₄₃	3451.119(4)	0.926(9)	0.949(5)	0.942(6)
γ₄₄	3547.93(6)	0.1939(20)	0.1955(15)
γ₄₅	3600.7(4)	0.0163(7)	0.0167(5)
γ₄₆	3611.8(8)	0.0084(4)	0.0086(3)
γ^±	511.0	40.1(8)	39(3)

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