RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 36 , Issue 2
Showing 1-10 articles out of 10 articles from the selected issue
  • Masayasu NOGUCHI
    1987 Volume 36 Issue 2 Pages 49-56
    Published: February 15, 1987
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    For elements of Z=1 to 92 and energy ranging from 10 keV to 10 Me V, empirical equations of photon interaction (photoelectric effect, Compton effect, coherent scattering and pair production) cross section were formed. The calculated values agreed to the reference values except for those in some extreme cases, where discrepancies are practically insignificant. Mass attenuation coefficients for various materials of known element composition can be easily calculated with the empirical equations.
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  • Shohei ISOMURA, Yasuhiko TONOOKA, Hayato KAETSU
    1987 Volume 36 Issue 2 Pages 57-63
    Published: February 15, 1987
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    In general, the distillation parameters, such as the number of theoretical plate (NTP) and the height equivalent to a theoretical plate (HETP), can be obtained from the operation at the steady state. However, it is time-consuming to achieve the steady state especially in the case of isotope separation.
    In this paper, with the purpose of simultaneous separation of isotopes of nitrogen and oxygen by NO distillation, we tried to determine the distillation parameters by an analytical method through the transient-state operation. It was confirmed that the results from the analysis were in good agreement with those observed for the operation at the steady state.
    Enrichment of the isotopes was carried out using a distillation column with a height of 1 m and inside diameter of 12 mm. The dependence of HETP on liquid flow rate was measured by the proposed method. The obtaind HETP values were from 2 to 4 cm. The operation time of about 5 h was found to be long enough to determine the distillation parameters.
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  • Takashi SUZUKI
    1987 Volume 36 Issue 2 Pages 64-69
    Published: February 15, 1987
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    A new non-destructive analytical method for 226Ra has been proposed which corrects the activity of 226Ra determined by γ-ray spectrometry, using that of 238U determined by the epithermal neutron activation analysis.
    The activity of 226Ra obtained by this method was compared with the activity of 214Bi measured more than 30 days after sealing the sample, by the usual non-destructive method, which took such a long time to analyze. The value of 226Ra derived from the 214Bi data fluctuated and was underestimated because of loss of 222Rn probably due to imperfect sealing. The present method is simpler and more rapid, because the consideration of the radioactive equilibrium and the chemical operation are unnecessary.
    The new method was applied to the analysis of deep well boring cores obtained at Higashikurume City in Tokyo, and the radioactive equilibrium of uranium series in the cores was discussed. As the results, it has been known that in the sandy and the silty cores, 226Ra/238U ratios are 2.4 and 1.7, respectively, and 214Bi/226Ra ratios are 0.29 and 0.46, respectively.
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  • Tsutomu SAGO, Yasuhito ISOZUMI
    1987 Volume 36 Issue 2 Pages 70-73
    Published: February 15, 1987
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    It has been shown that the fluctuation of background spectrum of γ rays measured by pure germanium detector is caused by the variation of atmospheric radioactivity (222Rn, 220Rn and their daughters) . In order to diminish the fluctuation, nitrogen gas from the cryogen tank of the detector is flown into the lead vessel for shielding natural radiations. With the aid of the gas flow, peak counts of γ rays from daughters of 222Rn and 220Rn in the background spectrum can be so decreased that their fluctuations become within statistical uncertainties. The fluctuation of the total count (0-2800 keV) also becomes within the statistical uncertainty although the decrease of the count by the gas flow is at most 4%.
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  • Madoka SUTOH, Takeo KOYAMA, Tadakatsu YONEYAMA
    1987 Volume 36 Issue 2 Pages 74-77
    Published: February 15, 1987
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    The natural abundance of 15N (expressed as δ15N per mil relative to air N2) in the tissues and the change of 15N abundance during the digestion processess in cattle, pig, and goat were investigated.
    The 15N abundances of cattle tissues differed by about 3.5‰ with high values in heart, urinary bladder and diaphragm. The ages of cattle did not affect on the 15N abundances of liver and kidney in cattle. The 15N abundances of urine were lower, and those of feces were a little higher than the values of diets in cattle and pigs. The δ15N values of milk and blood were higher than the value of diets. Two peaks of 15N abundances at forestomach and caecum were observed during the digestion processes of diet in goats.
    The mechanisms of the variation of 15N abundances in animal bodies were briefly discussed.
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  • Yukiko MORI, Hiroaki HOSHI, Seishi JINNOUCHI, Kuniko HARADA, Kouji ONO ...
    1987 Volume 36 Issue 2 Pages 78-80
    Published: February 15, 1987
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Serum neuron-specific enolase (NSE) levels were studied in 105 patients with malignant neoplasms (lung cancer 38, others 67) , 13 patients with various benign diseases and 7 healthy adults. The mean serum NSE level in adult control subjects was 7.4±0.8 ng/ml, and cut of level was decided 10 ng/ml. Serum NSE levels were elevated in 14/38 (37%) of patients with lung cancer and in 14/ 67 (21%) of patients with the other malignant neoplasms. In patients with benign diseases, serum NSE level was elevated only in one patient with pituitary adenoma. In 7 patients with small cell lung cancer, the positive rate was higher (86%) than in those with non-small cell lung cancer (26 %), and serum NSE levels were higher than 25 ng/ml except one case. There was no correlation between serum NSE and CEA (carcinoembryonic antigen) levels in patients with small cell lung cancer, also in patients with lung cancer. The measurement of serum NSE level seemed to be useful for diagnosis in patients with small cell lung cancer.
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  • Masayuki SHIMODAIRA
    1987 Volume 36 Issue 2 Pages 81-90
    Published: February 15, 1987
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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  • Tokuro NOBECHI
    1987 Volume 36 Issue 2 Pages 91
    Published: February 15, 1987
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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  • Shozo HASHIMOTO, Tadashi WADA
    1987 Volume 36 Issue 2 Pages 92-101
    Published: February 15, 1987
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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  • 1987 Volume 36 Issue 2 Pages A9P-A22M
    Published: February 15, 1987
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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