Status of the 36Cl AMS system at the University of Tsukuba

Nagashima, Y.; Seki, Riki; Takahashi, Tsutomu; Arai, Douglas K.

doi:10.1016/s0168-583x(00)00208-1

Cited by 16 publications

(10 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, significant amounts of 36 Cl were produced by neutron activation of 35 Cl in 10 seawater during thermonuclear testing on small islands or on barges (primarily between 1954 11 and 1958), and this bomb-36 Cl was injected into the atmosphere [10]. Fallout of this bomb- 36 Cl 12 has been preserved in ice cores, e.g., the Dye-3 cores from Greenland [11,12], show a 36 Cl peak 13 in the late 1950s (several years prior to the 3 H peak). The bomb-pulse 36 Cl is thought to have a 14 latitudinal distribution with greatest deposition at mid-latitudes [10].…”

Section: Introduction 17mentioning

confidence: 99%

Application of 36Cl as a dating tool for modern groundwater

Tosaki

Tase

Massmann

et al. 2007

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

1The 36 Cl/Cl ratios of groundwater samples were measured by AMS in order to investigate 2 the potential use of 36 Cl as a dating tool for modern groundwater. Groundwater samples were 3 obtained from several piezometers in the Oderbruch in northeastern Germany. The shallow 4 confined aquifer of the area is mainly recharged by the infiltration from the River Oder. From 5 the results of measurements, the pre-bomb and the recent background 36 Cl/Cl ratios in the basin 6 of the Oder were estimated to be 7-9 × 10 −14 . The 36 Cl fallout values estimated from the 36 Cl/Cl 7 ratios of the Oderbruch samples, which were dated by the 3 H/ 3 He method, show good agreement 8 with Dye-3 ice core data. These results suggest that the distribution of 36 Cl in groundwaters 9 reflects the influence of the 36 Cl bomb pulse. This, in turn, suggests that the distribution of 10 36 Cl/Cl in modern groundwaters could reveal groundwater ages and flow systems in a region. 11 12 PACS: 92.40.Kf; 91.67.Qr; 93.30.Ge; 06.60.Ei 13

show abstract

Section: Introduction 17mentioning

confidence: 99%

Application of 36Cl as a dating tool for modern groundwater

Tosaki

Tase

Massmann

et al. 2007

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

show abstract

“…The 36 Cl/Cl ratios were measured by the Tsukuba AMS system at the Tandem Accelerator Complex, University of Tsukuba (Nagashima et al, 2000;Sasa et al, 2007). The 36 S interference was corrected by using a blank sample prepared from NaCl reagent; typical correction rate was 10% for samples with a 36 Cl/Cl ratio of 1 × 10 12 .…”

Section: Analyses Of Samplesmentioning

confidence: 99%

“…The obtained 36 Cl/Cl ratio of the sample includes statistical error derived from uncertainties (1 ) of the sample, the standard and the blank. Details of the measurement and the 36 Cl/Cl calculations have been given in Nagashima et al (2000Nagashima et al ( , 2004. The overall precision of the system is better than 5%, and the background level of 36 Cl/Cl measurement is below 2 × 10 14 .…”

Section: Analyses Of Samplesmentioning

confidence: 99%

An Estimate of Local Bomb-Produced 36Cl Fallout Using the Depth Profile of Groundwater in the Tsukuba Upland, Central Japan

Tosaki

Tase

Yasuhara

et al. 2008

Hydrological Research Letters

View full text Add to dashboard Cite

Abstract:The depth profile of 36 Cl/Cl ratio in groundwater was investigated in the Tsukuba Upland of central Japan. The obtained results clearly show the influence of bomb-produced 36 Cl; the highest 36 Cl/Cl ratio is about one order of magnitude greater than the natural background ratio (1 × 10 13 ). The vertical distribution of 36 Cl is consistent with previous observations using 3 H and Darcy's law. From the profile, the total bomb-produced 36 Cl fallout in the upland is 2.3 × 10 12 atoms/m 2 after the correction for surface runoff (c.f. 2.4 × 10 12 atoms/m 2 at the Dye-3 site, Greenland) and a scaling factor of 0.96 was obtained (c.f. 2.5 based on the simplified latitudinal fallout distribution model). We then reconstructed the local fallout history of 36 Cl based on the Dye-3 data (scaled with a factor of 0.96 for the Tsukuba Upland) and the mean 36 Cl flux, produced in the atmosphere from cosmic rays and measured 30 atoms m 2 s 1 in the upland. The ratio of the maximum bomb-peak fallout to the average natural background flux of meteoric 36 Cl is consistent with that of measured data in Nepal. The result implies that the simplified latitudinal distribution model for 36 Cl deposition is not easily applicable for the prediction of the bomb-produced 36 Cl fallout pattern.

show abstract

“…The method was described previously [10]. A 'tri-molecular pilot beam' method is used to stabilize the terminal voltage.…”

Section: Measurement Of 36 CLmentioning

confidence: 99%