WJNST  Vol.5 No.1 , January 2015
Evaluation of Natural Radioactivity Levels for Structural Material Used in the Construction of the Neutrino Detector
ABSTRACT
In this work, the evaluation of natural radioactivity and spontaneous fission rates was performed for 8 nuclides from the natural radioactive 238U, 235U and 232Th decay chains. For this purpose, three samples of structural materials of the neutrino detector, i.e. aluminum, titanium and glass were analyzed by gamma spectroscopy and by neutron activation analysis to quantify a specific radioactivity of the samples. According to the results of this investigation, glass and aluminum samples have maximum values of the mean uranium concentrations 7.3(7) × 10-4% and 3.1(6) × 10-5%, respectively, while the lowest value for mean concentration of the uranium was found in titanium samples to be 4.7(3) × 10-6%. Aluminum sample had maximum values of the mean thorium concentrations, 2.5(8) × 10-3%, while the lowest value for mean concentration of the thorium was found in titanium samples to be 6.2(3) × 10-7%.

Cite this paper
Zinovyev, V. , Serebrov, A. , Mitropolsky, I. , Loginov, Y. , Shulyak, G. , Tyukavina, T. , Sakharov, S. and Chernyj, A. (2015) Evaluation of Natural Radioactivity Levels for Structural Material Used in the Construction of the Neutrino Detector. World Journal of Nuclear Science and Technology, 5, 43-56. doi: 10.4236/wjnst.2015.51005.
References
[1]   Wurm, M., Goeger-Neff, M. and Hochmuth, K.A. (2007) Detection Potential for the Diffuse Supernova Neutrino Background in the Large Liquid-Scintillator Detector LENA. Physical Review D, 75, Article ID: 023007.

[2]   Schon, R., Winkler, G. and Kustchera, W. (2004) A Critical Review of Experimental Data for the Half-Lives of the Uranium Isotopes 238U and 235U. Applied Radiation and Isotopes, 60, 263-273.

[3]   Holden, N.E. and Hoffman, D.C. (2000) Spontaneous Fission Half-Lives for Ground-State Nuclides. Pure and Applied Chemistry, 72, 1525-1562.
http://dx.doi.org/10.1351/pac200072081525

[4]   Garcia-Torano, E. (2000) Alpha-Particle Emission Probabilities in the Decay of 238U. Applied Radiation and Isotopes, 52, 591-594.
http://dx.doi.org/10.1016/S0969-8043(99)00215-8

[5]   Browne, E. and Tuli, J.K. (2007) Nuclear Data Sheets for A = 234. Nuclear Data Sheets, 108, 681-772.
http://dx.doi.org/10.1016/j.nds.2007.02.003

[6]   Hadler, J.C., Bigazzi, G., Guedes, S., Iunes, P.J., Oddone, M., Tello, C.A. and Paulo, S.R. (2003) Spontaneous 238U Fission Half-Life Measurements Based on Fission-Track Techniques. Journal of Radioanalytical and Nuclear Chemistry, 256, 155-157.

[7]   Firestone, R.B. (1998) Table of Isotopes [CD-ROM]. Lawrence Berkeley National Laboratory, Berkeley.

[8]   Von Gunten, H.R., Grutter, A. and Reist, H.W. (1981) Ground-State Spontaneous-Fission Half-Lives of Uranium Isotopes. Physical Review C, 23, 1110-1112.
http://dx.doi.org/10.1103/PhysRevC.23.1110

[9]   Akovali, Y.A. (1994) Nuclear Data Sheets for A = 234. Nuclear Data Sheets, 71, 181-259.
http://dx.doi.org/10.1006/ndsh.1994.1006

[10]   Wang, S., Brice, P.B., Barmick, S.W., Moody, K.J. and Hulet, E.K. (1987) Radioactive Decay of U234 via Ne and Mg Emission. Physical Review C, 36, 2717.
http://dx.doi.org/10.1103/PhysRevC.36.2717

[11]   Tuli, J.K. (2011) Nuclear Wallet Cards. 8th Edition, National Nuclear Data Center, Brookhaven National Laboratory, New York.

[12]   Artna-Cohen, A. (1997) Nuclear Data Sheets for A = 228. Nuclear Data Sheets, 80, 723-786.
http://dx.doi.org/10.1006/ndsh.1997.0007

[13]   Browne, E. (2005) Nuclear Data Sheets for A = 212. Nuclear Data Sheets, 104, 427-496.
http://dx.doi.org/10.1016/j.nds.2005.01.002

[14]   Browne, E. (2003) Nuclear Data Sheets for A = 235,239. Nuclear Data Sheets, 98, 665.
http://dx.doi.org/10.1006/ndsh.2003.0005

[15]   Chatani, H. (1983) A Measurement of the Averaged cross Section for the 232Th(n, 2n)231Th Reaction with a Fission Plate. Nuclear Instruments and Methods, 205, 501-504. http://dx.doi.org/10.1016/0167-5087(83)90016-9

[16]   Kohler, M., Degering, D. and Laubenstein, M. (2009) A New Low-Level g-Ray Spectrometry System for Environmental Radioactivity at the Underground Laboratory Felsenkeller. Applied Radiation and Isotopes, 67, 736-740.

[17]   DIN 25482-5 (1993) Limit of Detection and Limit of Decision for Nuclear Radiation. Measurements—Part 5: Counting Measurements by High Resolution Gamma. Spectrometry, Neglecting the Influence of Sample Treatment. BeuthVerlag, Berlin.

[18]   Erdtmann, G. and Petri, H. (1986) Nuclear Activation Analysis: Fundamentals and Techniques. In: Elving, P.J., Ed., Treatise on Analytical Chemistry (NY), Part 1, Vol. 14, 2nd Edition, John Wiley & Sons, Inc., Hoboken.

 
 
Top