Akio Makishima et al. (2008) Precise measurement of 228Ra/226Ra for 226Ra determination employing total integration and simultaneous 228Th correction by multicollector ICP-MS using multiple ion counters, Journal of Analytical and Atomic Spectrometry, 23, 1102-1107, doi: 10.1039/b807431c. < 20100403102546030.admin > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    A precise method of measuring 228Ra/226Ra for 226Ra determination used in U-series disequilibrium studies has been developed using the total integration method with simultaneous 228Th isobaric interference correction by multicollector ICP-MS with multiple ion counters (MIC). A sample solution of 0.2 ml was separately taken into a test tube, and all 226Ra+ and 228Ra+ signals as well as 229Th+ and 228Th16O+ from beginning to end were integrated simultaneously using four channeltrons, IC1, IC3, IC4 and IC5, respectively. Gains between IC1 and IC3 and the mass discrimination factor for 228Ra/226Ra determination were canceled out by measurement of a Ra spike solution with an accurately known Ra isotope ratio determined by TIMS, with which samples were bracketed. The isobaric interferences of 228Th+ were simultaneously corrected from the signal of 228Th16O+ and the oxide forming ratio of 228Th, which was separately determined by simultaneous measurements of 229Th+ and 229Th16O+ by IC3 and IC5. The gains between IC3 and IC5 for the Th correction were also canceled out. The ion yield of Ra in MIC-ICP-MS was ∼1.5%. The intermediate precision using 6.6, 3.3, 1.7, 0.83 and 0.41fg of 226Ra with 228Ra/226Ra = ∼5 was 0.33, 0.93, 0.76, 1.6 and 1.5%, respectively. The 228Ra/226Ra ratio showed no systematic change dependent on 228Ra/226Ra up to 0.25, indicating the validity of the 228Th correction. At similar amounts of Ra, our method gives intermediate precision values similar to or better than previous MC-ICP-MS and TIMS studies. The precision of the method was verified using another Ra spike with 228Ra/226Ra = ∼1 determined by TIMS. The analytical performance of the method was further investigated using the silicate samples JB-2 and JB-3 basalts issued by GSJ.

  • doi: 10.1039/b807431c
  • modified at 17 h ago


(a) MC-ICPMS on MC-ICP-MS Finnigan, Neptune
Img 8252@58452bedef311c2498f872f thumb JB-2 < 20130416090250-887738 >pub
  • classification: volcanic:basaltic
  • physical-form: powder
  • status: (unknown)
  • description: Geological Survey of Japan silicate reference material - tholeiitic basalt from Izu-Oshima, Japan (erupted in 1950 AD); split 7, position 19
  • modified at 2020-05-11
Tixhr1947484362 thumb JB-3 powder < 20170620122529-773001 >pub
  • classification: volcanic:basaltic
  • physical-form: aliquot
  • quantity (g): 1.56
  • description: Geological Survey of Japan silicate reference material - basaltic rock from Mt.Fuji
  • modified at 2020-05-12
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JB-2_U pub ICPMS Thermo-Fisher Neptune 2 20191023140518-782251
JB-2_Hf pub MC-ICP-MS Finnigan, Neptune 2 20191023150858-360045
JB-2_Li pub ICPMS Yokogawa PMS2000 1 20191015113423-995945
JB-2_Th pub ICPMS Thermo-Fisher Neptune 2 20191023140820-456541
JB-2_Bi-Tl-In-Cd pub Q-ICPMS Agilent 7500cs 4 20191002151232-133506
JB-2_d66Zn pub ICPMS Thermo-Fisher Neptune 1 20191003102338-443368
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JB-2_Ge-As-Se-Te pub Q-ICPMS Agilent 7500cs 4 20191004111800-764807
JB-2_Ta-Hf-Nb-Zr pub ICPMS Yokogawa PMS2000 4 20191008105612-696377
JB-2_S pub HR-ICPMS Finningan, Element 1 20191008141043-335650
JB-2_Cr-Ni-Cu-Zn pub HR-ICPMS Finningan, Element 4 20191009100320-804729
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JB-2 pub MC-ICP-MS Finnigan, Neptune 1 20191219094725-536598
JB-2_S (Max, 2012) pub ICPMS Thermo-Fisher Neptune 1 20191223152828-773022
JB-2_226Ra pub MC-ICP-MS Finnigan, Neptune 1 20200131112956-636986
JB-2_Li pub TIMS Thermo-Fisher MAT261 2 20200210103937-712454
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JB-3_Pb-Max2007 pub ICPMS Thermo-Fisher Neptune 3 20191023142827-497265
JB-3_Pb pub TIMS Thermo-Fisher MAT261/262 3 20190604111451-846233
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JB-3 powder_d56Fe pub ICPMS Thermo-Fisher Neptune 1 20191003113551-869058
JB-3_Pb-Kuritani2006 pub TIMS Thermo-Fisher MAT261 6 20191021120551-635445
JB-3 powder_Ge-As-Se-Te pub Q-ICPMS Agilent 7500cs 4 20191004111800-712270
JB-3 powder_TE_Max2006 pub Q-ICPMS Agilent 7500cs 42 20191018153909-515065
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JB-3_Cr-Ni-Cu-Zn pub HR-ICPMS Finningan, Element 4 20191009100320-202959
JB-3 powder pub MC-ICP-MS Finnigan, Neptune 1 20191219094725-478773
JB-3_S (Max, 2012) pub ICPMS Thermo-Fisher Neptune 1 20191223153137-826757
JB-3_Hf pub MC-ICP-MS Finnigan, Neptune 4 20200130145207-610371
JB-3_226Ra pub MC-ICP-MS Finnigan, Neptune 1 20200131113011-012974
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JB-3_Nd pub TIMS Thermo-Fisher Triton 1 20200130154048-265743
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JB-3 pub XRF PANalytical PW2400 3 20200219100213-362614
JB-3 pub Q-ICPMS Agilent 7500cs 48 20190903121150-057348
JB-3_leached pub ICPMS Yokogawa PMS2000/Agilent 7500cs 1 20190521100452-639887
JB-3_leached pub TIMS Thermo-Fisher MAT261 1 20190521101551-819463
JB2-1_Ra pub TIMS Thermo-Fisher MAT262 4 20191011135228-878050
JB2-1_Sm-Nd pub TIMS Thermo-Fisher MAT261 4 20191011101646-745665
JB2-1_Rb-Sr pub TIMS Thermo-Fisher MAT261 4 20191011101511-959093
JB2-1_Li pub TIMS Thermo-Fisher MAT261 2 20191011095740-854602
JB2-1_Pb pub TIMS Thermo-Fisher MAT261 3 20191011093459-383699
JB2-1_B pub TIMS Thermo-Fisher MAT261 2 20191011091956-857703
JB2-2_Ra pub TIMS Thermo-Fisher MAT262 4 20191011135602-253524
JB2-2_Sm-Nd pub TIMS Thermo-Fisher MAT261 4 20191011102056-733424
JB2-2_Rb-Sr pub TIMS Thermo-Fisher MAT261 4 20191011101815-177013
JB2-2_Li pub TIMS Thermo-Fisher MAT261 2 20191011095851-447069
JB2-2_Pb pub TIMS Thermo-Fisher MAT261 3 20191011093639-992779
JB2-2_B pub TIMS Thermo-Fisher MAT261 2 20191011092231-398963
name spots global-id
caption ID assembly stone
226Ra concentrations for JB-2 and JB-3 by MC-ICP-MS pub 20200131112936-695996 226Ra (Max et al., 2008) 2
manual
  • name
  • Akio Makishima
  • Takele A. Chekol
  • Eizo Nakamura