ガンマ線スペクトロメトリーにおける210Pb, 214Pbの解析方法
Contents
1. 10 100 OSL 2V0Pb 46 5keV 74Pb 351 9keV 86400 86400 343600 of ed 2 3 30 JAMSTEC Rep Res Dev Volume 12 March 2011 27 35 Radionuclide for Gam2. A 2008 2010 2QPb Cs Lk
3. F Multi channel analyzer A D converter High voltage module Amplifier module Fig 1 Overview of a gamma ray analysis system 1 Cryostat Dewar jar
4. 4 Pb Pb MCA 3 PIE MCA 2 4 LT pb 0 08Bq g MCAT 1 3
5. 1 5 MCA 2 Pb Pb DL 1a 86400 46 SkeV 20Pb 33keV 63 3keV Th Fig 1 351 9keV 2 Pb 1 4 a 4 O 234 4 210 Pb Th so tee wits 4 3 ae a og orn a Rg
6. T 1980 Be 2000 2 7726 X ye p f F atx heel i 8 arbx h W g i 2 7726 w PE wPKview csv Synergy Software Kaleida Graph
7. 9 2 7726 we oni m Noe A je dx h W 10 EA 2 7126 20Pb 40 53 5keV pb JAMSTEC Rep Res Dev Volume 12 March 2011 27 35 31 Pb Pb Investigation of analytical methods of 20Pb and 2 Pb nuclides 345 5 359keV Fig 3 pb 2 7 Pb Pb Pb Pb MCA
8. 134 143 1980 112 116 1991 2000 PARREREN CERT E 15 133 137 JAMSTEC Rep Res Dev Volume 12 March 2011 27 35 35
9. 10 17 Pb Pb 2 92 0 39keV 3 27 0 44keV 3 Fig 40 lZ MCA 2Pb 24Pb Fig 4 1 MCA 20Pb Fig 4 0 Pb MCA 1 1 Fig 4 2 24pb 0 08Bq g k EE D MLJuLUJLWp I
10. eee Pb Pb 2010 10 4 2010 12 10 1 2 237 0061 2 15 046 867 9794 ogurik jamstec go jp AVERE 4 27 Pb Pb Investigation of analytical methods of Pb and pb nuclides Original Paper Investigation of analytical methods of Pb and Pb nuclides from gamma ray spectrometry Kazumasa Oguri Saiko Sugizaki Koichi Iijima Tatsuhiko Sakamoto and Hiro
11. MCA 2Pb 2 4 MCA pb Fig4 3 N 1 3 29pb 5000 T T T T T 214 Pb 2 4000 3000 4 L J E J fo 8 L 4 2000 4 1000 228 AC 4 0 i Ca aot 1 660 680 700 720 740 760 Channel Fig 5 7 Pb 1 and Pb 2 peaks obtained to measure DL 1a reference material 34 JAMSTEC Rep Res Dev Volume 12 March 2011 27 35 5 DL la 86400 20Pb 1 2 Pb K Oguri etal 2 Pb
12. 4096 E 1 2048keV MCA MENTA 2 2 YK08 11 1 cm 60C Ba Co
13. Pb 4 Pb 1 1 N MCA JAMSTEC Rep Res Dev Volume 12 March 2011 27 35 33 Pb PLD HEMT ATIC BSS A IRET Investigation of analytical methods of 7 Pb and Pb nuclides T MCA D MCA Fig 4 0 08Bq g 3 1 1 Rig 4 MCA YPb 1991 MCA
14. Fig 2 MA nEn N 2 3 Npe 5 Np Ai N ARNr 4 Fig 2 Peak area calculation by Covell s method Cited after Science and Technology Agency 1992 2 1992 CHS BB By 2 P _ RtR L R R L t LL R R L L 6 7 Ly R L L XR Ly 1 2 PR RR GE Re L 3 0Pb 29Pb 1 5 MCA 2 6
15. N 48 000 48 500 49 000 49500 50 000 50 500 51 000 51 500 52 000 62500 53 000 4 Fig 3 An image applying curve fit method using with a Kaleida Graph 3 Kaleida Grapn 32 JAMSTEC Rep Res Dev Volume 12 March 2011 27 35 y m1 m2 xtm3 exp 2 7726 3958 2121 0 085713 m5 46235 0 039391 fem 44922 NAI gm el osu ml 25262 0085713 K Oguri etal 210pb 210pb 08 T 77 08 p T 1E 4 y 0 95x 0 057 fe 4 H A wh ADELS 4 g o 0 98x 0 012 s E R2 lt 0 78 R2 0 99 g i 8 os N os Y 1 E F J lt os KoA S os Pn J E fg T 3 Mh N a I A us os 03 2 D gt ol A o N r a pl a EnS 47 af a i fia g oz Z o he N K ma 1 4 7 oi y 2 ai x giles 1 Er Serer ares aren erie EYA J A 1 SFP rr rerun ares art L 0 0 1 0 2 03 04 0 5 06 07 08 0 0 1 02 03 04 0 5 0 6 07 0 8 pp Bq g by Covell s method 210 Ph Bq g by Covell s method 214 pb 214P 0 12 SS eee IH T re y 1 14x 0 0049 N y 1 12x 0 0049 Z eee EA rege Fa g Soa N 2s 0 t g Z N 1 E 008 4 oof At
16. Pb one 6500 A 2008 2010 20244084 Covell D F 1959 Determination of gamma ray abundance directly from total absorption peak Anal Chem 31 11 1785 1790 1992
17. 0 SkeV AD R Table Radionuclides used for energy calibration their gamma ray energy and the emission rates K 3g 12mmg FOR Ra Rn Uranium Thorium Ore DL 1a Canadian Centre for Mineral and Energy Technology 3 g
18. 1 VA s Z ee 006 fi 4 O oot gt i 4 1 2 f z a Ne se 004 L es ae D 0 04 L Pa g NNN 9 d os 2 2 a a 0 02 F a 0 02 1 x 3 4 0 L FAN MEE Se eee Se eee en 0 ZL 1 0 0 02 0 04 0 06 0 08 0 1 0 12 0 0 02 0 04 0 06 0 08 0 1 0 12 214 Pb Bq g by Covell s method 214 Pb Bq g by Covell s method Fig 4 Comparison of 2 Pb and Pb concentrations calculated with MCA emulation software Covell s method and curve fit method 1 Comparison of 210Pb concentrations between Covell s method and MCA emulation 2 Comparison of Pb concentrations obtained by Covell s method and curve fit method 3 Comparison of 4Pb concentrations obtained by Covell s method and MCA emulation 4 Comparison of Pb concentrations obtained by Covell s method and curve fit method Dashed lines in each figure represent relationship of 1 1 N in the graph represents the values that MCA emulation software detected another peak around the 2 Pb or 7 Pb peaks and the baseline area for the calculation was automatically shifted 4 MCA pb 2 ppb 1 MCA 2 Pb 2 2VPb 3 MCA
19. 20Pb Pb 2 21 Fig 1 ORTEC GWL 12030 10 cm MCA7800 ORTEC 659 ORTEC 672 NIM F yE NEC PC 9801BX4 AD Gamma ray detector Shield JAMSTEC Rep Res Dev Volume 12 March 2011 27 35 29 Pb Pb Investigation of analytical methods of pb and Pb nuclides ADC1821 0 skeV
20. jp hmatsu specanal csy Microsoft Excel 2 Pb 27Pb 25 Covell 1959 K Oguri etal 1992 EF W Ro M 1
21. JAMSTEC Rep Res Dev Volume 12 March 2011 27 35 E 20Pb 29Pb AN RR Pb NE T 20Pb 27Pb MCA 2Pb MCA MCA
22. el 80 100 120 140 Channel 338 3keV Ac Fig 5 2 MCA 351 9keV Pb 35 8 Fig 52 2WPb Pb 4 05 Fig 5 1 pb pb Fig 4 1 N
23. ma ray Emission energy calibration energy ke V rate Ba 80 998 36 Ba 276 397 qT Ba 302 851 19 6 Ba 356 005 67 Ba 383 851 9 4 Co 1173 21 99 92 Co 1332 46 100 2 4 MCA Ek lk MCA MCA csv MS Windows wPKview http rewwwkek
24. shi Kitazato We introduced gamma ray analysis system in order to measure recent sedimentation rates by Pb method and to obtain dose rates of quartz grains in sediments for optically stimulated luminescence OSL dating Because both Pb method and OSL dating require precisional values of the radionuclide concentrations we compared 7 Pb and Pb concentrations determined by MCA emulation software of the system Covell s method and curve fitting method respectively Pb concentrations in some samples determined by the MCA emulation software showed higher values to compare with other methods The cause would be in an automatic definition of the baseline by the software during the calculation of the net area of Pb peaks Keywords Gamma ray spectrometry Covell s method Curve fit method Pb Pb Received 4 October 2010 Accepted 10 December 2010 1 Institute of Biogeosciences Biogeos Japan Agency for Marine Earth Science and Technology JAMSTEC 2 Marine Technology Center MARITEC Japan Agency for Marine Earth Science and Technology JAMSTEC Corresponding author Kazumasa Oguri Institute of Biogeosciences Biogeos Japan Agency for Marine Earth Science and Technology JAMSTEC 2 15 Natsushima cho Yokosuka 237 0061 Japan Tel 81 46 867 9794 ogurik jamstec go jp Copyright by Japan Agency for Marine Earth Science and Technology 28 JAMSTEC Rep Res Dev Volume 12 March 2011 27 35 K Oguri et al 1
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