Determination of radium isotopes in environmental samples by gamma spectrometry, liquid scintillation counting and alpha spectrometry: A review of analytical methodology

Journal of Environmental Radioactivity

Volumn 106, Issue , 2012, Pages 98-119

  Jia, Guogang ^a   Jia, Jing ^a  

^a CHINA INSTITUTE OF ATOMIC ENERGY   (China)

Author keywords

spectrometry; 223Ra; 224Ra; 226Ra; 228Ra; Liquid scintillation counting

Indexed keywords

ALPHA SPECTROMETRY; ANALYTICAL METHODOLOGY; ANALYTICAL TECHNIQUES; CHEMICAL SEPARATION; ENVIRONMENTAL SAMPLE; GAMMA SPECTROMETRY; LIQUID SCINTILLATION COUNTING; MAXIMUM SENSITIVITY; MEASUREMENT TECHNIQUES; MINIMUM DETECTABLE ACTIVITIES; ORDERS OF MAGNITUDE; PRE-CONCENTRATION; RADIUM ISOTOPES; SAMPLE PREPARATION; SPECTROMETRY TECHNIQUE;

ALPHA PARTICLE SPECTROMETERS; DOSIMETRY; ISOTOPES; LIQUIDS; RADIATION PROTECTION; SCINTILLATION; SCINTILLATION COUNTERS; SEPARATION; SPECTROMETRY;

RADIUM;

BARIUM; ION EXCHANGE RESIN; MANGANESE DIOXIDE; RADIUM; RADIUM 224; RADIUM 226; RADON; RADON 222; URANIUM;

ACCURACY ASSESSMENT; ISOTOPIC ANALYSIS; LITERATURE REVIEW; PURIFICATION; RADIUM ISOTOPE; SAMPLING; SPECTROMETRY; TOXICITY; TOXICITY TEST; TRACER;

ACCURACY; ALPHA RADIATION SPECTROMETRY; ANALYTIC METHOD; ENVIRONMENTAL PROTECTION; GAMMA SPECTROMETRY; GEOCHEMISTRY; ION EXCHANGE CHROMATOGRAPHY; ISOTOPE ANALYSIS; LIQUID SCINTILLATION COUNTING; MAGNITUDE ESTIMATION METHOD; MEASUREMENT; MINIMUM DETECTABLE ACTIVITY; PURIFICATION; RADIATION DETECTION; RADIATION PROTECTION; RADIOACTIVITY; RADIOMETRY; REVIEW; SEDIMENT; SEPARATION TECHNIQUE; SOIL ANALYSIS; SOLID PHASE EXTRACTION; SOLVENT EXTRACTION;

RADIATION MONITORING; RADIOACTIVE POLLUTANTS; RADIUM; SCINTILLATION COUNTING; SPECTRUM ANALYSIS;

EID: 84856516438     PISSN: 0265931X     EISSN: 18791700     Source Type: Journal    
DOI: 10.1016/j.jenvrad.2011.12.003     Document Type: Review

References (136)

1. Aceña M.L., Crespo M.T. On the influence of lead daughters on radium determination. Appl. Radiat. Isot. 1988, 39(2):177-178.
2. 228Ra determination in environmental samples by alpha-particle spectrometry. J. Radioanal. Nucl. Chem. 2008, 277(3):1-9.
3. 226Ra in natural water. Sci. Total Environ. 1995, 173-174:53-59.
4. Al-Masri M.S., Byrakdar M.E., Mamish S., Al-Haleem M.A. Determination of natural radioactivity in Euphrates river. J. Radioanal. Nucl. Chem. 2004, 261(2):349-355.
5. 137Cs activity concentration in the bottom sediment cores from Kuwait Bay. J. Radioanal. Nucl. Chem. 2005, 266(2):269-276.
6. Alvarado J.S., Orlandini K.A., Erickson M.D. Rapid determination of radium isotopes by alpha spectrometry. J. Radioanal. Nucl. Chem. 1995, 194(1):163-172.
7. 226Ra for radiometric age determination of long-lived fishes. Can. J. Fish. Aquat. Sci. 1999, 56(8):1329-1338.
8. Aupiais J., Dacheux N. Understanding the peak asymmetry in alpha liquid scintillation with β/γ discrimination. Radiochim. Acta 2000, 88(7):391-398.
9. 226Ra in mineral drinking waters by α liquid scintillation with rejection of β-γ emitters. Anal. Chem. 1998, 70(11):2353-2359.
10. 137Cs. J. Radioanal. Nucl. Chem. 2004, 259(1):177-180.
11. 223,224,226,228Ra by alpha and gamma spectrometry. Radiochim. Acta 1998, 83(2):53-60.
12. Bayés J.C., Gómez E., Garcias F., Casas M., Cerdà V. Radium determination in mineral waters. Appl. Radiat. Isot. 1996, 47(9-10):849-853.
13. Becker J.S., Soman R.S., Sutton K.L., Caruso J.A., Dietze H.J. Determination of long-lived radionuclides by inductively coupled plasma quadrupole mass spectrometry using different nebulizers. J. Anal. Atom. Spectrom. 1999, 14(6):933-937.
14. 226Ra and uranium isotopes in solid samples by fusion with lithium metaborate and alpha spectrometry. ScientificWorldJournal 2002, 2:1891-1905.
15. Bojanowski R., Radecki Z., Burns K. Determination of radium and uranium isotopes in natural waters by sorption on hydrous manganese dioxide followed by alpha-spectrometry. J. Radioanal. Nucl. Chem. 2005, 264(2):437-443.
16. Bortoli M.D.E., Gaglione P. Radium-226 in environmental materials and foods. Health Phys. 1972, 22:43-48.
17. Burnett W.C., Tai W.C. Determination of radium in natural waters by α liquid scintillation. Anal. Chem. 1992, 64(15):1691-1697.
18. Burnett W.C., Cable P.H., Moser R. Determination of radium-228 in natural waters using extraction chromatographic resins. Radioactivity Radiochem 1995, 6:36-44.
19. 7Be by γ spectrometry on evaporated fresh water samples. Environ. Sci. Technol. 2003, 37(21):4990-4993.
20. 224Ra in water and aqueous solutions by liquid scintillation counting. Radiocarbon 1993, 397-408. (Proc. of Advances in Liquid Scintillation Spectrometry), Tucson, Arizona.
21. Chalupnik S., Lebecka J., Mielnikow A., Michalk B. Determining radium in water: comparison of the methods. Radiocarbon 1996, P103-P109. (Proceedings of Advances in Liquid Scintillation Spectrometry 1994), Tucson, Arizona.
22. Chau N.D., Niewodniczański J., Dorda J., Ochoński A., Chrusciel E., Tomza I. Determination of radium isotopes in mine waters through alpha- and beta-activities measured by liquid scintillation spectrometry. J. Radioanal. Nucl. Chem. 1997, 222(1-2):69-74.
23. 210Pb in sea water sampled by in-situ large volume filtration and sorption by manganese oxyhydroxide. Sci. Total Environ. 1994, 155(3):272-283.
24. 225Ra as yield tracer. Appl. Radiat. Isot. 2000, 53(1-2):109-114.
25. Crespo M.T., Jiménez A.S. On the determination of radium by alpha spectrometry. J. Radioanal. Nucl. Chem. 1997, 221:149-152.
26. Currie L.A. Limits for qualitative detection and quantitative determination. Application to radiochemistry. Anal. Chem. 1968, 40:586-593.
27. Cuttell J.C., Lloyd J.W., Ivanovich M. Astudy of uranium and thorium series isotopes in chalk groundwaters of Lincolnshire, UK. J. Hydrol. 1986, 86(3-4):343-365.
28. 224Ra by high resolution alpha spectrometry. Nucl. Instrum. Methods Phys. Res. 1984, 223(2-3):253-258.
29. Decaillon J.-G., Bickel M., Hill C., Altzitzoglou T. Validation of methods for the determination of radium in waters and soil. Appl. Radiat. Isot. 2004, 61:409-413.
30. Del Carmen Godinez M., José Luis Iturbe G., Eduardo Ordonez R., Solache-Rios M. Determination of radium-226 in phosphate fertilizers and gypsum by gamma-ray spectrometry. Int. J. Environ. Pollut. 1997, 8(1-2):195-200.
31. Dulaiova H., Burnett W.C. An efficient method for γ-spectrometric determination of radium-226, 228 via manganese fibers. Limnol. Oceanogr. Methods 2004, 2:256-261.
32. 226Ra by using 3M's EMPORE™ Radium Rad disks. J. Radioanal. Nucl. Chem. 1997, 223(1-2):225-228.
33. 228Ra in mineral water samples of the Slovak Republic. Czech. J. Phys. 2006, 56(Suppl. 4):D247-D255.
34. Ebaid Y.Y., El-Tahawy M.S., El-Lakany A.A., Garcia S.R., Brooks G.H. Environmental radioactivity measurements of Egyptian soils. J. Radioanal. Nucl. Chem. 2000, 243(2):543-550.
35. EC Council Directive 98/83/EC of November 1998 on the quality of water intended for human consumption. Off. J. L 05/12/1998, 330:32-54.
36. Eikenberg J., Bajo S., Beer H., Hitz J., Ruethi M., Zumsteg I., Letessier P. Fast methods for determination of anthropogenic actinides and U/Th-series isotopes in aqueous samples. Appl. Radiat. Isot. 2004, 61(2-3):101-106.
37. 2-coated discs. J. Environ. Radioact. 2001, 54(1):109-131.
38. EPA (Environmental Protection Agency, U.S.A.) National Primary Drinking Water Regulations 2000.
39. 226Ra in environmental matrices using collision cell inductively coupled plasma mass-spectrometry. J. Radioanal. Nucl. Chem. 2003, 256:53-60.
40. Forte M., Rusconi R., Cazzaniga M.T., Sgorbati G. The measurement of radioactivity in Italian drinking waters. Microchem. J. 2007, 85:98-102.
41. 226Ra and Ba concentrations in the Ross Sea measured with multicollector ICP mass spectrometry. Mar. Chem. 2004, 87:59-71.
42. 226Ra determination by electrodeposition. Sci. Total Environ. 1988, 69(1):225-238.
43. Gleason G. Radioelement Analysis Progress and Problems 1974, 47. Ann Arbor Science, Ann Arbor. W.S. Lyon (Ed.).
44. 210Pb in environmental samples. J. Radioanal. Nucl. Chem. 1994, 182(1):165-169.
45. Goldin A.S. Determination of dissolved radium. Anal. Chem. 1961, 33(3):406-409.
46. Hakam O.K., Choukri A., Reyss J.L., Lferde M. Determination and comparison of uranium and radium isotopes activities and activity ratios in samples from some natural water sources in Morocco. J. Environ. Radioact. 2001, 57(3):175-189.
47. Hamilton T.F., McRae V.M., Smith J.D. Radium isotope determination by alpha-spectrometry after electrodeposition from solution with added platinum. J. Radioanal. Nucl. Chem. 1994, 177(2):365-371.
48. Hancock G.J., Martin P. Determination of Ra in environmental samples by α-particle spectrometry. Appl. Radiat. Isot. 1991, 42(1):63-69.
49. 228Ra via gamma-ray spectrometry. Radiat. Meas. 2006, 41(4):486-491.
50. Hetman A., Dorda J., Zipper W. Determination of radium isotopes concentrations in mineral waters by liquid scintillation method. Nukleonika 1998, 43(4):481-488.
51. Horwitz E.P., Chiarizia R., Dietz M.L. Anovel strontium selective extraction chromatographic resin. Solvent Extr. Ion Exch 1992, 10:313-336.
52. Hou X., Ross P. Critical Comparison of Radiometric and Mass Spectrometric Methods for the Determination of Radionuclides in Environmental, Biological and Nuclear Waste Samples 2007, Radiation Research Department, Riso National Laboratory, Roskilde, Denmark. http://www.risoe.dk/rispubl/art/2007_333.pdf.
53. IAEA Analytical Methodology for the Determination of Radium Isotopes in Environmental Samples 2010, IAEA, IAEA/AQ/19, Printed by the IAEA in Vienna, Austria.
54. 137Cs and radium isotopes as new geochemical tracers in a ground water flow system. J. Radioanal. Nucl. Chem. 2007, 273(1):177-181.
55. Jesse D. Johnson Determination of Radium-228 in Natural Waters 1971, United States Department of the Interior, Library of Congress catalog-card No. 72-610150, U. S. Government Printing Office, Washington, DC, 20402, Geological survey water-supply paper 1696-G (G1-G25).
56. 210Po. Appl. Radiat. Isot. 2007, 65:849-857.
57. Jia Guogang, Torri G., Innocenzi P., Ocone R., Di Lullo A. Determination of radium isotopes in mineral water samples by α-spectrometry. Int. Congr. Ser. 2005, 1276:412-414.
58. Jia Guogang, Torri G., Innocenzi P., Ocone R., Di Lullo A. Determination of radium isotopes in mineral and environmental water samples by alpha-spectrometry. J. Radioanal. Nucl. Chem. 2006, 267(3):505-514.
59. Jia Guogang, Torri G., Ocone R. Determination of radium isotopes in soil samples by alpha-spectrometry. J. Radioanal. Nucl. Chem. 2007, 273(3):779-783.
60. 228Ra in large volumes of well waters. Health Phys. 1989, 57(1):167-168.
61. 226Ra in waters by γ-ray spectrometry. Appl. Radiat. Isot. 1997, 48(5):631-638.
62. 226Ra. J. Radioanal. Nucl. Chem. 1995, 198(1):143-150.
63. 226Ra in public water supply by a γ-ray spectrometry. Health Phys. 1990, 59:125-131.
64. Karangelos D.J., Petropoulos N.P., Anagnostakis M.J., Hinis E.P., Simopoulos S.E. Radiological characteristics and investigation of the radioactive equilibrium in the ashes produced in lignite-fired power plants. J. Environ. Radioact. 2004, 77(3):233-246.
65. 226Ra activities in natural waters using a radon-in-air monitor. Environ. Sci. Technol. 2001, 35(23):4680-4683.
66. 226Ra in environmental samples using high-resolution inductively coupled plasma mass spectrometry. J. Radioanal. Nucl. Chem. 1999, 240(2):613-618.
67. Kim Cheol-Su, Kim Chang-Kyu, Martin Paul, Sansone Umberto Determination of Pu isotope concentrations and isotope ratio by inductively coupled plasma spectrometry: a review of analytical methodology. J. Anal. Atom. Spectrom. 2007, 22:827-841.
68. 226Ra in water samples. Appl. Radiat. Isot. 2002, 56(1-2):387-392.
69. Koide M., Bruland K.W. The electrodeposition and determination of radium by isotopic dilution in seawater and in sediments simultaneously with other natural radionuclides. Anal. Chim. Acta 1975, 75(1):1-19.
70. 222Rn using a 4-inch silicon epitaxial detector. Chemia Analityczna 2004, 49(1):29-39.
71. Lally A.E., Glover K.M. Source preparation in alpha spectrometry. Nucl. Instrum. Methods Phys. Res. 1984, 223:259-265.
72. 226Ra in environmental samples by inductively coupled plasma mass spectrometry after sequential selective extraction. J. Anal. Atom. Spectrom. 2003, 18:338-343.
73. 226Ra in environmental samples. Sci. Total Environ. 1988, 70(1):83-99.
74. Lawrie W.C., Desmond J.A., Spence D., Anderson S., Edmondson C. Determination of radium-226 in environmental and personal monitoring samples. Appl. Radiat. Isot. 2000, 53(1-2):133-137.
75. Loyd D.H., Drake E.N. An alternative method for Ra determinations in water. Health Phys. 1989, 57(1):71-77.
76. 4 coprecipitation for the preparation of alpha-spectrometric sources. J. Radioanal. Nucl. Chem. 1997, 223(1-2):133-137.
77. Lucas H.F., Markun F., Boulenger R. Methods for Measuring Radium Isotopes: Emanometry. Chapter 3-2 in "The Environmental Behaviour of Radium", Technical Reports Series No. 310 1990, vol. 1. International Atomic Energy Agency, Vienna, pp. 149-172.
78. 224Ra in drinking waters by liquid scintillation counting. Appl. Radiat. Isot. 1997, 48(4):535-540.
79. 228Ra analysis in water samples. J. Radioanal. Nucl. Chem. 2006, 270(3):651-655.
80. McCurdy D.E., Mellor R.A. Determination of radium-224, -226, and -228 by coincidence spectrometry. Anal. Chem. 1981, 53(14):2212-2216.
81. McDowell W.J., Moyer B.A., Case G.N., Case F.I. Selectivity in solvent extraction of metal ions by organic cation exchangers synergized by macrocycles: factors relating to macrocycle size and structure. Solvent Extr. Ion Exch 1986, 4:217-236.
82. Michel J., Moore W.S., King P.T. γ-ray spectrometry for determination of radium-228 and radium-226 in natural waters. Anal. Chem. 1981, 53(12):1885-1889.
83. 2 resin. Appl. Radiat. Isot. 2003, 59(4):255-262.
84. 224Ra in samples affected by non-nuclear industries wastes. J. Radioanal. Nucl. Chem. 2000, 245(2):309-315.
85. Moron M.C., Garcia-Tenorio R., Garcia-Montano E. An easy method for the determination of Ra isotopes and actinide alpha emitters from the same water sample. Appl. Radiat. Isot. 1986, 37(5):383-389.
86. 228Ra in samples simulating coal mine water. Nukleonika 1998, 43(4):469-480.
87. 228Ra in human teeth by age groups and in other substances. Int. J. Appl. Radiat. Isot. 1984, 35(12):1113-1115.
88. Moebius S., Kamolchote P., Ramamonjisoa T.L., Yang M. Rapid determination of Ra, Rn, Pb and Po in water using extractive liquid scintillation. Radiocarbon 1993, (Proc. Advances in Liquid Scintillation Spectrometry 1992), Tucson, Arizona.
89. Nour S., El-Sharkawy A., Burnett W.C., Horwitz E.P. Radium-228 determination of natural waters via concentration on manganese dioxide and separation using Diphonix ion exchange resin. Appl. Radiat. Isot. 2004, 61:1173-1178.
90. Orlandini K.A., Gaffney J.S., Marley N.A. An improved technique for the rapid assay of radium isotopes in water. Radiochim. Acta 1991, 55:205-207.
91. 228Ra concentrations in drinking water by gamma spectroscopy. Health Phys. 2003, 85(5):613-620.
92. 212Pb in a single analysis for drinking water and wastewater: dissolved and suspended fractions. Health Phys. 2004, 86(2):145-149.
93. 228Ra activities in drinking water using a single sample preparation procedure. Health Phys. 2005, 89(6):660-666.
94. Partington J.R. General and Inorganic Chemistry 1966, Macmillan London, Melbourne, Toronto St Martiu's press, New York, 195 pp. fourth ed.
95. Percival D.R., Martin D.B. Sequential determination of Radium-226, Radium-228, Actinium-227, and Thorium isotopes in environmental and process waste samples. Anal. Chem. 1974, 46(12):1742-1749.
96. 238U disequilibria in volcanic rocks using plasma ionization multicollector mass spectrometry. Chem. Geol. 2002, 188:171-191.
97. Purkl S., Eisenhauer A. Solid-phase extraction using Empore™ radium rod disks to separate radium from thorium. J. Radioanal. Nucl. Chem. 2003, 256:473-480.
98. Purkl S., Eisenhauer A. Arapid method for α-spectrometric analysis of radium isotopes in natural waters using ion-selective membrane technology. Appl. Radiat. Isot. 2003, 59(4):245-254.
99. 222Rn in a groundwater affected coastal area of the Baltic Sea and the underlying sub-sea floor aquifer. Mar. Chem. 2004, 87(3-4):137-149.
100. 226Ra by liquid scintillation counting. J. Radioanal. Nucl. Chem. 2002, 254:181-185.
101. 2-rich thermal waters from the French Massif Central. Chem. Geol. 2002, 182(2-4):400-421.
102. Rodriguez-Alvarez M.J., Sanchez F. Measurement of radium and thorium isotopes in environmental samples by alpha-spectrometry. J. Radioanal. Nucl. Chem. 1995, 191(1):3-13.
103. Rogers V.C. Detection limits for gamma-ray spectral analysis. Anal. Chem. 1970, 42:807-808.
104. Roman D. Electrodeposition of radium on stainless steel from aqueous solution. Appl. Radiat. Isot. 1984, 35:990-992.
105. 228Ra, gross alpha, and uranium in California groundwater. Health Phys. 2005, 89(6):667-678.
106. Rundo J. History of the determination of radium in man since 1915. Environ. Int. 1993, 19(5):425-438.
107. Rusconi R., Azzellino A., Bellinzona S., Forte M., Gallini R., Sgorbati G. Assessment of drinking water radioactivity content by liquid scintillation counting: set up of high sensitivity and emergency procedures. Anal. Bioanal. Chem. 2004, 379(2):247-253.
108. 228Ra in environmental waters. J. Radioanal. Nucl. Chem. 2003, 255:535-538.
109. Salonen L. Arapid method for monitoring of uranium and radium in drinking water. Sci. Total Environ. 1993, 130/131:23-35.
110. Salonen L., Hukkanen H. Advantages of low-background liquid scintillation alpha spectrometry and pulse shape analysis in measuring Rn-222, uranium and Ra-226 in groundwater samples. J. Radioanal. Nucl. Chem. 1997, 226(1-2):67-74.
111. Santos M.S., Azeredo A.M.G.F., Melo D.R., Juliao L.M.Q.C. Determination of alpha-emitters in Brazilian tobacco. J. Radioanal. Nucl. Chem. 1994, 182(1):57-62.
112. Schönhofer F. Simplified method of Ra-226 measurements with application of organic scintillator. Radiocarbon 1993, (Proceedings of Advances in Liquid Scintillation Spectrometry 1992), Tucson, Arizona.
113. 210Pb by selective adsorption and liquid scintillation spectrometry. Radioact. Radiochem. 2001, 12(2):33-38.
114. Semkow T.M., Parekh P.P., Schwenker C.D., Khan A.J., Bari A., Colaresi J.F., Tench O.K., David G., Guryn W. Low-background gamma spectrometry for environmental radioactivity. Appl. Radiat. Isot. 2002, 57(2):213-223.
115. 228Ra activities associated with agricultural drainage ponds. J. Environ. Radioact. 2001, 55:29-46.
116. Sill C.W., Puphal K.W., Hindman F.D. Simultaneous determination of alpha-emitting nuclides radium through californium in soil. Anal. Chem. 1974, 46(12):1725-1737.
117. Sill C.W. Determination of Radium-226 by High Resolution Alpha Spectrometry 1983, Report CONF-830695-Y.
118. 225Ra as a yield tracer. J. Radioanal. Nucl. Chem. 1970, 5:303-312.
119. 220Rn). J. Radioanal. Nucl. Chem. 1988, 123(1):107-119.
120. 226Ra in drinking water supplies of Iran. Health Phys. 1999, 77(2):150-153.
121. 226Ra in Hungarian bottled mineral water. J. Environ. Radioact. 2002, 62:235-240.
122. 226Ra and uranium in fish samples from waters of the Grand Canyon by alpha spectroscopy without electrodeposition. J. Radioanal. Nucl. Chem. 1989, 137(3):213-217.
123. Stewart B.D., McKlveen J.W., Glinski R.L. Determination of uranium and radium concentrations in the waters of the Grand Canyon by alpha spectrometry. J. Radioanal. Nucl. Chem. 1988, 123(1):121-132.
124. Strom D.J., Stansbury P.S. Minimum detectable activity when background is counted longer than the sample. Health Physics 1992, 63:360-361.
125. Sturchio N.C. Radium isotopes, alkaline earth diagenesis, and age determination of travertine from Mammoth Hot Springs, Wyoming, USA. Appl. Geochem. 1990, 5(5-6):631-640.
126. Testa C., Desideri D., Meli M.A., Bazzarri S. Separation and determination of uranium and radium-226 in phosphorites and their industrial derivatives by extraction chromatography. J. Radioanal. Nucl. Chem. 1989, 129(1):191-200.
127. Thakkar A.H., Fern M.J., McCurdy D. Arapid determination of Ra-226 and Ra-224 using extraction chromatography. Proc. of 9th Int. Symposium on Environmental Chemical Analysis, Maidstone (2002) 2003, 69-75. The Royal Society of Chemistry, Cambridge.
128. 226Ra. J. Radioanal. Nucl. Chem. 1995, 198(1):143-150.
129. 224Ra in sediments samples by liquid scintillation counting. Radiat. Meas. 2005, 39(5):543-550.
130. Volpe A.M., Olivares J.A., Murrell M.T. Determination of radium isotope ratios and abundances in geologic samples by thermal ionization mass spectrometry. Anal. Chem. 1991, 63(9):913-916.
131. 222Rn in Austrian drinking water. J. Radioanal. Nucl. Chem. 2007, 274(3):511-516.
132. 226Ra. J. Radioanal. Nucl. Chem. 1992, 160(2):477-485.
133. 226Ra in environmental water samples by alpha-ray spectrometry. Radiochim. Acta 1989, 46:137-142.
134. Yusof A.M., Ting S.W., Wang L.K., Akyil S. Determination of natural radioactivity in public drinking water quality assessment. J. Radioanal. Nucl. Chem. 2001, 249(1):233-238.
135. Zikovsky L. Determination of alpha-radioactivity in ground water by precipitation of alpha-emitters with sulphates and hydroxides. J. Radioanal. Nucl. Chem. 2002, 251(2):329-331.
136. 226Ra at ultratrace level in mineral water samples by sector field inductively coupled plasma mass spectrometry. J. Environ. Monit. 2005, 7(5):514-518.