Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Hiroki Yonezawa"'
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 217:289-292
The effectiveness of charged particle (alpha) activation analysis in determining the content of ion-implanted boron on the surface of Si wafers and the doped boron in epitaxially grown Si film and SiO2 film was evaluated. The method was found to be a
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 216:237-240
The surface concentrations of copper and iron in currently used silicon wafers are lower than 1014 atoms·m−2. To determine such ultra-trace elements accurately by neutron activation analysis, we measured the efficiencies of a well-type Ge detector
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry Articles. 207:413-423
Oxygen was determined in three kinds of ZrF4-based fluoride glass [ZrF4−BaF2−GdF3−AlF3 (ZBGA), ZrF4−BaF2−LaF3−YF3−AlF3−LiF−NaF (ZBLYALN) and ZrF4−BaF2−LaF3−YF3−AlF3−LiF (ZBLYAL)] used for fabricating optical fiberby18O(p,
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry Articles. 203:3-9
In order to determine iron on silicon wafer surface at a level of 1014 atoms·m−2 the efficiency of a well-type Ge detector for59Fe γ-ray emissions was measured and a low temperature silicon direct bonding technique was developed. With silicon dir
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry Articles. 185:83-90
A simplified method for the substoichiometric analysis of phosphorus has been developed and applied to determine the concentration distribution of phosphorus in the region of a SiO2−Si interface in order to explain why phosphorus is lost from the i
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry Articles. 173:409-417
The charged particle activation analysis of ultra-trace carbon in boron-doped silicon with the12C(d,n)13N reaction has been developed. In order to apply13N substoichiometric separation to determine carbon in silicon, we studied the rapid dissolution
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry Articles. 167:81-88
We have developed charged particle activation analysis to determine light elements at a sub-ppb level. This analytical method is characterized by sample bombardment with charged particles at a few tens of mA and substoichiometric separation for13N,11
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry Letters. 119:237-246
A substoichiometric analytical method, using a carrier-free radioisotope, is developed for the accurate and precise determination of yttrium. The method is applied to yttrium determination in high-Tc superconducting oxide ceramics. The error of the a
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry Letters. 119:433-440
Carrier-free88Y radioisotope, which has the longest half life /T=106.6 d/ of yttrium radioisotopes and is a γ-ray emitter, was obtained by proton irradiation of strontium, followed by cooling for one month. Then,88Y was purified by precipitating str
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry Articles. 102:177-186
The comparator method using substoichiometry is developed. In the method, the contents of the elements can be determined simultaneously by the measurement of radioactivities of the comparator elements and of simultaneously separated parts of the elem