RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 14 , Issue 4
Showing 1-14 articles out of 14 articles from the selected issue
  • Takami KOYANAGI
    1965 Volume 14 Issue 4 Pages 279-285
    Published: July 15, 1965
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    Simpler methods have been introduced for statistical confidence test of radiation counter.In one of these methods the closer the unbiased estimate of the variance is to the unbiased estimate of the mean the counter is worthy of confidence. But these simpler methods cannot give the significance level, the power. of the test and the number of measurements necessary for obtaining the power.
    To establish more precise method for testing, several types of methods are discussed in this paper. TheX2-goodness-of-fit testis most familiar among them, but it has the demerit that the results of the test are fairly affected by the way of dividing the data into classes.The “modified X2-testalso has the same shortage as X2-test. Though the “ω2-testis not affected by the way of dividing the data, it does not give the significance level.
    It has been found through the study of comparison that the “likelihood ratio test” is the best for the “confidence test”. By using the last method, the critical region and the power curves of the confidence test are given in three diagrams. Lastly the counting results are plotted on the probability paper. This graph may visualize the goodness-of-fit, though it can't be given numerically. So it must become possible to estimate the goodness-of-fit from these plots on the probability paper through much experience.
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  • Hiroshi IMAMURA, Kaoru UCHIDA, Hiroshi TOMINAGA
    1965 Volume 14 Issue 4 Pages 286-292
    Published: July 15, 1965
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    An industrial fluorescent X-ray analyzer with radioactive sources for rapid analysis of lime, silica, alumina, and ferric oxide in cement raw mix samples has been completed for mixing control of raw materials. The analyzer is characterized by (1) the combined use of alpha-ray source and soft X-ray source, (2) the vacuum-sealed measuring head made to be sample-changeable without air inflow, (3) the non-dispersive simultaneous determination of elements with a stabilized pulse height spectrometer, and (4) the spectrometer circuits are all transistorized. Further, in the determination, (5) fused glassy samples are used, and (6) the calculation to deal with the matrix effect is carried out by a process control electronic computer. The determination is expected to be more accurate than the usual fluorescent X-ray analysis. The use of the analyzer is considered to be favorable, for it is simple in principle, easy in practice, speedy in measurement, and economical.
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  • Michio KATAGIRI, Hiro YAMASAKI
    1965 Volume 14 Issue 4 Pages 293-299
    Published: July 15, 1965
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    All solid-state pre-amplifier (ionization-current amplifier) for β ray thickness gage has been satisfactorily invented (by authors) and it is approved ideal for process automation by the actual many applications.
    This amplifier which is named “Pico-diode electrometer” has the very eminent characteristics over the conventional type of vacuum tube or vibrating capacitor electrometer.
    It has no drift (less than 2×10-15A/°C at 0-50°C) immediately after switching on for almost eternal period in the sensitivity of 10-11-10-12 ampere through the input resistor of more than 1010ohm.
    The circuit is a type of parametric oscillating amplifier which gives high gain and excellent stability with a simple circuit.
    This new solid stata electrometer makes “β gageeminently reliable than ever before on the process application.
    We describe in this paper the principle of the parametric oscillating amplifier, its characteristics and the system of the β ray thickness gage with the electrometer.
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  • Tsunesaburo ASADA, Riichi KIKUCHI, Akihiro TOMITA, Kiyoshi TERAI
    1965 Volume 14 Issue 4 Pages 300-302
    Published: July 15, 1965
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    A low cost, simple, convenient and quick readout dose detector whose color change indicates a threshold dose is developed. This detector is a paraffin base film made from polyvinyl chloride (PVC) powder and Congo red. The detector is based on the liberation of chlorine from PVC under irradiation, proportional to absorbed dose, leading to the formation of acid which can cause color change of Congo red.
    The H+-ion yield from PVC powder (mean grain size=120 microns) by irradiation (G [H+] -value) is determined from the pH-value of irradiated PVC powder in water. The film made from PVC powder 50 w%, Congo red 0.1 w% and paraffin 50 w% shows a distinct color change at 3×104r of γ-irradiation, where the dose rate is 6.5×104r/hr. It is possible to make a film which changes its color at a higher threshold dose by adding NaOH in Congo red in advance. This threshold dose where color change of the detector initiates is able to be controlled by changing an amount of NaOH. Properties of this detector are reported.
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  • Charles A. LEONE, Man-Sik KANG
    1965 Volume 14 Issue 4 Pages 303-308
    Published: July 15, 1965
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    The effect of gamma-irradiation on aqueous solutions of triglycine was studied by means of spectrophotometry of biuret complex, ultraviolet absorption technique, paper chromatography, low voltage electrophoresis of copper complex, and carbonyl compound determination. Initial G values for peptide bond rupture at various concentrations and carbonyl compound formation were determined.
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  • Hiroshi TANOOKA
    1965 Volume 14 Issue 4 Pages 309-314
    Published: July 15, 1965
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    The amount of 226Ra and 210Po in teeth and bone of American subjects having no history of the occupational exposure was measured and expressed by the unit curie/g⋅Ca for comparison with the expression curie/g⋅ash. 226Ra was measured by deemanating 222Rn gas from the sample solution and counting by the ZnS-coated scintillation counter, 210Po was measured by plating on a silver foil and counting by a gas-flow counter, and the calcium content was measured by the flame photometer.
    More amount of both nuclides was found in bone than in teeth and more amount of 210Po (consequently 210Pb) was found in both bone and teeth than the amount expected as a daughter of the 226Ra content. This measurement was performed as a part of the project of Dr. Hursh's laboratory at the University of Rochester.
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  • Sadatake KATO, Kunio KURATA, Yoshihiko SUGISAWA
    1965 Volume 14 Issue 4 Pages 315-318
    Published: July 15, 1965
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    99mTc was introduced as a new radioactive diagnostic agent. The methods of preparing radioactive pertechnetate and Tc2S7 colloid solutions for intravenous use were described. The test methods for radiochemical purities of these preparations with paperchromato gram were also described. These preparations were injected into rats and distributions of these radioactivities were measured. Pertechnetate was cleared rapidly from blood of these experimental animals and concentrated in their stomachs in the highest ratio of 5-10% of total administrated dose for at least 5 hours after injection. Relatively high uptake ratio per gram of tissue was also found in the thyroid gland. Tc2S7 colloid was also cleared very rapidly from the blood and concentrated into the liver. More than 60% of total administrated radioactivity was taken up by the liver and the level was maintained almost constantly for at least 5 hours.
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  • Masakazu YAMADA, Kiyoshi YOSHIKAWA, Masaoki YAMADA
    1965 Volume 14 Issue 4 Pages 319-323
    Published: July 15, 1965
    Released: September 07, 2010
    JOURNALS FREE ACCESS
    An attempt was made to study possible relations between histologic fixatives and radioactivity maintained in tissue specimens. The specimens were obtained from the liver of rats treated in vivo with 35S-sodium sulfate. Radioactivities released from or kept in tissues were measured after fixation with various agents. An assumption that fixatives prevent a release of radioactivity from tissue specimens has been evaluated throughout the present experiments as follows: As a single fixative fluid, non-aqueous fluid, such as ethanol, shows the highest inhibition of the release. Of the aqueous fluids, trichloroacetic acid and lead acetate show an inhibition of the release which is denied to formalin. In the case of mixed agents, when aqueous fluids are employed in combination with respective, indicated agents for radioactive substances, the release may be inhibited, as shown by an additional use of barium chloride or calcium chloride for fixing radioactivity of 35S-sulfate in tissue.
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  • Tatuo MAEDA, Seiichi YOSHIMOTO, Yoshihiko OSHIUMI
    1965 Volume 14 Issue 4 Pages 324-327
    Published: July 15, 1965
    Released: July 21, 2010
    JOURNALS FREE ACCESS
    1) Isoresponse curve showing distribution of radioisotope. 2) Television technique for color translation of scintigram. External measurement of distribution of a radioisotope in an organ using scintiscanner-ratemeter-recorder system was performed. And then the map of radioisotope distribution was obtained. The map (Isoresponse curve) manifests the quantitative information better than usual black dots scintigram.
    An apparatus for color translation of scintigram was described. This apparatus produces a pattern of 8 colors related to the density of dots of scintigram. Quantitative information is obtained because the color change with dots density transverse the area. And this apparatus has an advantage that color translation of the previously obtained usual black dots scintigram is possible. Furthermore, this technique is useful to convert the density of film to the .isodose color patterns, in the measurement of depth dose distribution in daily radiotherapy.
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  • [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    1965 Volume 14 Issue 4 Pages 328-330
    Published: July 15, 1965
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese], [in Japanese], [in Japanese]
    1965 Volume 14 Issue 4 Pages 331-334
    Published: July 15, 1965
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1965 Volume 14 Issue 4 Pages 335-342
    Published: July 15, 1965
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1965 Volume 14 Issue 4 Pages 343-352
    Published: July 15, 1965
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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  • 1965 Volume 14 Issue 4 Pages A477-A160
    Published: July 15, 1965
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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