Study of 26Al measurement on the Shanghai Mini-cyclotron based AMS
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Accelerator mass spectrometry
For the production of intensive meson beams, a ring cyclotron for a 100 μA proton beam at 590 MeV is presently being constructed at the Swiss Institute for Nuclear Research (SIN) near Villigen, in the northern part of Switzerland. The pre‐acceleration of the beam to 72 MeV will be accomplished by an AVF‐cyclotron, which can also be used for acceleration of d, He and heavy ions to variable energies. The status of the development and construction of the ring cyclotron is described.
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A number of new reactions, some of them of a nuclearfusion type, were observed in the 63-in. N cyclotron. Angular distributions of particles produced in nuclear reactions were measured extensively with the internal beam of the 86- in. cyclotron. Trial production of a numberof radioisotopes in this cyclotron revealed that significant reductions in the cost of cyclotron-produced isotopes can be expected. New techniques are being developed which will contribute to the plans for the deflection of the beam of the 86-in. cyclotron. Preliminary design studies were made for a variable-energy cyclotron and for an 80-Mev heavy- particle cyclotron. The program for the separation of Pu isotopes has advanced to the point where it is clear that such separation is feasible. A study program involving small package-type reactors was started. (auth)
Beam energy
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Accelerator mass spectrometry
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Accelerator mass spectrometry (AMS) is a highly sensitive method for counting atoms. It is used for detecting very low concentrations of both radionuclides and stable nuclides. The main advantages of AMS compared to conventional radiometric methods are the use of smaller samples (mg size) and shorter measuring times (less than one hour). In AMS, rare isotopes from a sample material placed in the ion source of an electrostatic tandem accelerator are measured by counting individual atoms with nuclear detection techniques after acceleration to energies in the MeV range. A dramatic improvement in background rejection for AMS systems has, in the best cases, led to a 108 increase in sensitivity for isotope ratio measurements compared to the older technique of mass spectrometry. In this report some current applications of the AMS technique at the Lund Pelletron accelerator, as well as the recent improvements of the Lund system, are presented.
Pelletron
Accelerator mass spectrometry
Nuclide
Tandem accelerator
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We present results of current measurements on the super-sensitive mini-cyclotron as an accelerator mass spectrometer, successfully developed at Shanghai Institute of Nuclear Research (SINR). We describe new ideas and unique techniques adopted for increasing the transmission efficiency in the injection, acceleration and extraction region, for eliminating various backgrounds and for improving the precision of 14 C analysis, which have led to the breakthrough of our Shanghai Mini-Cyclotron Accelerator Mass Spectrometry project. We also discuss further development of the prototype facility.
Accelerator mass spectrometry
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The construction of a superconducting cyclotron of the MSU design (K=500, Kf=160) is under way at Texas A&M. It will be used both alone and as an injector for the existing 88" (K147) cyclotron. A beam optics study has been carried out for injection of K500 cyclotron heavy-ion beams into the K147 cyclotron. This study traces a variety of beams from extraction at the K500 cyclotron until focused and dispersion matched into the proper orbit of the K147 cyclotron. The line is configured to decouple the parameters of each cyclotron by first bringing the momentum dispersion to zero and then producing a double waist which serves as the apparent source for the second cyclotron. Beam line optics for standalone operation of the K500 cyclotron, which provides for use of the present experimental facilities, have also been studied. Construction of the K500 cyclotron is proceeding approximately on schedule with operation expected in 1985.
Cyclotron resonance
Ion cyclotron resonance
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In this paper, the principle, the analytical method and the application prospect for the determination of 36Cl in underground water by accelerator mass spectrometry(AMS) are introduced. 36Cl in underground water of quaternary from Changzhou was determined by AMS and the origin of brine water from this area was characterized using chlorine isotopes. The results from 36Cl data show that the ages for the underground water of the 3rd group(Q2) and the 4th group(Q1) from this area are 250 ka and 300 ka respectively.\=\=
Accelerator mass spectrometry
Isotopes of chlorine
Brine
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Accelerator mass spectrometry
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High-resolution as well as high-precision age estimation is particularly important for Quaternary research to realize its main aim of better understanding of global environmental changes of the past and realistic prediction of the changes in the near future. Among several dating methods that are applicable to Quaternary samples, radiocarbon (14C) dating has been commonly used since its development in late 1940s.A new 14C detection technique, accelerator mass spectrometry (AMS), has been developed since 1977. The method directly detects and counts 14C atoms, instead of counting β-ray emitted in the decay of 14C, and therefore requires only a few mg of carbon for 14C measurements. Nowadays, AMS 14C dating is widely used and more than sixty AMS 14C facilities are in operation in the world. In Japan, eight facilities for AMS 14C dating have been in use since 2004.As one of the eight AMS 14C measurement systems in Japan, the Nagoya University AMS group has started routine 14C measurements with the firstly introduced Tandetron AMS system since 1983 and also with the secondly established Tandetron AMS since 1999. The second system has an excellent performance of the standard deviation (one sigma) of the 14C/12C ratios of around ±0.2% to ±0.4% (±17-±30 14C yrs) and that of the corresponding 13C/12C ratios of ±0.03% to ±0.07%, as are tested for HOxII targets. By using this AMS system, we are now trying to provide accurate ages to the Quaternary events. Briefly discussed in this article are, (1) a consistency test of the established IntCal98 and IntCal04 14C data sets with the 14C-concentration records in Japanese tree rings ; (2) programs of high accuracy and precision age estimation by 14C wiggle matching techniques for wood samples ; (3) investigations of 14C reservoir effect for marine samples from the Japanese Archipelago.
Accelerator mass spectrometry
Geochronology
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Accelerator mass spectrometry
Separator (oil production)
Isobar
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