Ren Chiba

Simultaneous determinations of Fe, Cu, Zn, and Br concentrations in human tissue sections

Proton-induced x-ray fluorescence has been used to determine the concentration of trace elements in human prostate and liver tissue samples. Ca, Fe, Cu, and Zn were observed in all specimens. Small amounts of Br were detected in most of the prostates, and in nearly half of the livers. The data indicate that the Fe content decreases in malignant liver tissues and the quantities of Cu and Zn are also decreased, but to a lesser extent.

Analysis of elements in soluble and insoluble fractions of rain water by PIXE

Abstract Samples of rainwater were collected and filtered through a 47 mm θ Nuclepore filter (pore size 0.4 μm, 10 μm thickness), to separate soluble and insoluble materials. Yittrium solution was added to the samples as the internal standard, and the samples were concentrated to 1 ml by evaporation. 50 μl portions of the concentrated sample were dried on a Mylar film (4 μm thickness) and irradiated by the proton beam of 10 nA (2.50 MeV) from a Van de Graaf accelerator. The insoluble part of the sample on the Nuclepore filter was also irradiated in the same way. 10 elements K, Ca, Ti, V, Mn, Fe, Ni, Zn and Pb were determined with an accuracy of about 10%. The measured values were cross-checked by atomic absorption spectrometry. The concentrations of most elements were much higher in the soluble fraction, but soil derived elements such as Ti, Fe and Mn had considerably higher concentration in insoluble fractions.

Analyses of particle production in hadron-nucleus reactions at several GeV with a two-moving-source model

Abstract Spectra of protons and pions emitted in the target-rapidity region in hadron-nucleus reactions at 3 and 4 GeV c were observed in wide momentum- and angular-acceptance measurements. Fitting to the data with the two-moving-source model well reproduced experimental proton spectra with the slope parameters of 50–60 MeV for one component and 110–125 MeV for another. The slope parameters for pions were 120–165 MeV, larger than those for protons. Energy depositions of GeV particles were estimated by integrating energies carried away through the particle production

The T = 1, isospin triplet states in A = 30 nuclei

Abstract The level structure of 30 S was studied using the 28 Si (τ, n p ) reaction at E τ = 9.5 MeV , and J π values were determined for some proton-emitting states by the neutron-proton angular correlation measurements. The Coulomb displacement energy of the isospin triplet state of A = 30 nuclei was analyzed using first-order perturbation theory. Large deviations from perturbation theory were found for the ground state, the 2 + 1 state, the 3 − 1 state and the second excited 0 + state. These results might be explained by the effect of the pairing correlation of the two valence protons in 30 S under the assumption of charge symmetry for the nucleon-nucleon interaction.

Deuteron emission from pion absorption at Tπ = 65 MeV

Abstract The angular distributions of high-energy deuterons and proton-deuteron coincident events were measured at T π = 65 MeV for C, Al and Cu. The angular distribution of the inclusive ( π + , d) cross section was similar to that of the inclusive ( π + , p?) reaction, but the ratios of the inclusive ( π + , pd?) cross section to the inclusive ( π + , pp) cross section had a strong angular dependence. These results support the idea that contributions from the three-nucleon absorption as well as those from the two-step process are important for the emission of high energy deuterons at T π = 65 MeV.

Release of P and K from Yeast cells irradiated by vacuum UV Below 170 nm

SummaryYeast cells were irradiated with monochromatic synchrotron radiation (SR) under wet conditions in the wavelength region from 160 to 185 nm at INS-SOR, Tokyo. By the particle-induced X-ray emission (PIXE) method applied to whole cells several elements were found to be released from the irradiated cells at the wavelengths shorter than 170 nm. The most drastic release occurred with phosphorus, followed potassium. Sulphur and calcium were not released over the whole wavelength region studied. It was also revealed that the release of these elements paralleled the cell inactivation. The cause of these element releases upon vaccuum-UV irradiation was inferred in relation to the dissociation of H2O molecules located in the vicinity of the cell surface region.

High Energy δ-Rays Ejected by Ion Atom Collision

High energy (δ-rays (10–80 keV) from thin foils of C, Al, Ti and Ag induced by 1–4 MeV protons and 2–8 MeV α-particles were measured. The double differential cross sections and the angular distributions are compared with BEA calculations. The experimental cross sections at 30° agree with calculation. However, measured values are much larger than the calculations at 60° and 90°.

PIXE ANALYSIS OF CELLULAR ELEMENT CONTENTS FOR INVESTIGATION OF HEAT INACTIVATION OF MAMMALIAN CELLS

PIXE analysis was successfully applied to the measurement of cellular elements of mammalian cells in relation to the study of hyperthermia. V79 cells were heated at 44.0°C for 30 min or 1 h and the following element releases or uptakes were determined with PIXE measurement of samples obtained after appropriate periods of incubation at 37°C. Linear relationships were confirmed between the produced X-ray yields of P, S, Cl, K and Ca and the cell numbers. The cellular contents P, S, and K decreased promptly after the heat treatment and recovered gradually in the following incubation. Changes in the contents of Cl and Ca did not show abrupt decreases. Curiously, the content of Ca increased after the treatment at 44.0°C for 30 min. The results suggest that various structural modifications were induced in the membrane by the heat treatment.

A rapid analysis for 15N-tracers by a proton reaction

Abstract A system of quantitative analysis for 15N-tracers with a yield measurement of the intense γ-rays by 15N(p, αγ)12C reaction has been developed. The method is unique in sample preparation with no chemical processes and in the direct analysis of intact samples.

Cytolytic assay with stable chromium and PIXE method

tips Elektronenmikroskop EM 400 HMG [8]) zeigt (Fig. l c), besitzt VsNbgO=9 eine Struktur, bei der die [3 x 4]-B16cke fiber die lange Kante miteinander verknfipft sind. Dutch Untersuchung einer gr6geren Anzahl yon Kristallbruchstticken wurde gefunden, dab dieser Be fund f~r V3Nb9029 repr~isentativ ist. Die zeichnerische Interpretation (Fig. lb) der Durchstrahlungsaufnahmen erfolgte wie bei [8]. Mit Hilfe der Elektronenbeugungsaufnahme ([010]-Zone; Fig. 1 d) konnte die Guinier-Aufnahme indiziert werden; damit sind die Gitterkonstanten: