RADIOISOTOPES

An Improved Ratio Circuit for Position Sensitive Detector and Its Uses

Shunsuke NAKAMOTO, Masakatsu SAKISAKA

1971Volume 20Issue 1 Pages 1-6
Published: January 15, 1971
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.1

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An improved ratio circuit for the position sensitive detector uses has been fabricated by applying the pulse sampling technique. The ratio magnitude of the input X and E signals has been converted to a square pulse of width τ (∝X/E), which is changed to the pulse amplitude to be analysed. The final E and X/E pulses of 2μs duration are simultaneously put out. The present X/E range is from 0.1 to 1.0 and its linearity is about 1%. The illustrative characteristics using ²¹⁰Po-α, ²⁴¹Am-α particles and accelerated protons are presented.

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Activation Analysis of Oxygen in Phosphorus with Fast Neutron

Masanori NAKANE, Hiroshi ISHIKAWA, Yoshizo MIYAKE

1971Volume 20Issue 1 Pages 7-11
Published: January 15, 1971
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.7

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To determine the oxygen content in phosphorus, fast neutron activation analysis has been investigated.
The optimum discriminator level for the measurement of gamma rays from ¹⁶N produced by (n, p) reaction was determined to be 4.0MeV. The effective absorption coefficient for red phosphorus was determined to be 0, 81. The calibration curve made with graphite powder containing glucose showed good linearity in the range of 0-50 mg oxygen. An empirical formula of this calibration curve was y=209.3 x+190.8, the slope of which showed the sensitivity of the determination. The determination limit of the proposed method was 200 ppm oxygen for red phosphorus. The precision expressed in terms of the coefficient of variation was 3.5-10.1% with the sample containing 1.21-19.91 mg of oxygen.

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Separation of Carrier-free ⁸⁵Sr from a Deuteron Bombarded Rubidium Target

Mariko INARIDA, Akira SHIMAMURA

1971Volume 20Issue 1 Pages 12-14
Published: January 15, 1971
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.12

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The rubidium nitrate was bombarded by 15MeV deuteron particles in the 160 cm-IPCR cyclotron. The bombarded rubidium nitrate was dissolved in a hydrochloric acid solution of pH3, and 10% cupferron solution was added. The ⁸⁵Sr was extracted by shaking with TBP for 1 min. The extraction was repeated three times. The organic phase was washed with pH3 hydrochloric acid solution (2% cupferron) and then the carrier free ⁸⁵Sr was back-extracted into pH3 hydrochloric acid solution. The recovery was about 95%. A carrier free ⁸⁵Sr with sufficiently high radiochemical purity was obtained by this simple procedure.

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Deposition of lodine-131 on Plant Leaves (1)

Yoichiro OHMOMO, Masamichi SAIKI

1971Volume 20Issue 1 Pages 15-19
Published: January 15, 1971
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.15

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This experiment was carried out in order to know the deposition and the distribution of CH₃¹³¹I, ¹³¹I₂ and Na¹³¹I on plant leaves such as spinach, Chinese cabbage, Komatsuna and camellia quantitatively and autoradiographically. CH₃¹³¹I deposited on Chinese cabbage, spinach and camellia leaves on the similar level. On the contrary, ¹³¹I₂ deposited strongly on spinach and Chinese cabbage leaves and slightly deposited on camellia leaves. It was suggested that ¹³¹I₂ deposited more strongly on leafy vegetables than CH₃¹³¹I. Both CH₃¹³¹I and ¹³¹I₂ were concentrated in the vein of the leaves. No radioactivity was detected on the leaves which were steeped in the Na¹³¹I solution.
Effective removal of iodine-131 from the contaminated leaves was not clearly recognized by washing them with detergent, CCl₄, ether, 0.5N HCl and 0.5N NaOH.

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Res-O-Mat T₃

-A New Diagnostic Kit of Thyroid Function-

Katsutoshi TATSUKI, Kazuya UCHIDA

1971Volume 20Issue 1 Pages 20-24
Published: January 15, 1971
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.20

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Res-O-Mat T₃, a new diagnostic kit of thyroid function, was examined especially regarding the standard serum.
Res-O-Mat T₃ is based upon the same principle as the resin sponge kit. The major difference in the methods of this kit and the resin sponge kit lies in that, while in the latter method ¹³¹I-T₃ bound to thyrobinding globulin is estimated directly by means of resin sponge, the fromer estimates the binding ¹³¹I-T₃ remaining iii the test serum after free ¹³¹I-T₃ in the serum is absorved by the resin strip and discarded. Although the ¹³¹I-T₃ uptake of serum was affected largely by the time and temperature of incubation, the variations produced by different times and temperatures on the ¹³¹I-T₃ uptakes of patient serum and standard serum were proportional to each other and a nearly constant value of the TBC index was obtained. Therefore, the various test conditions, e.g. incubation time and temperature, can be selected without worrying about their influence on the TBC index.
The ¹³¹I-T₃ uptake of serum was also dependent upon the serum volume, but the TBC index values were always constant, if the volume of standard and patient serum tested was strictly the same.
The reproducibility of this kit by days was very satisfactory, that is SD: 0.027 and CV: 2.7% to 0, 986 average.
The correlation coefficient for values obtained by Res-O-Mat T₃ kit and the resin sponge kit was 0. 84, except for some cases observed especially in eu- and hypothyroid.

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Determination of Trace Elements in Tea Plant by Neutron Activation Analysis

Tadakazu TAKEO, Masao SHIBUYA

1971Volume 20Issue 1 Pages 25-28
Published: January 15, 1971
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.25

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Determination of Selenium in Cigarettes by Neutron Activation Analysis

Kazuhide KOMIYA, Yoshiaki MARUYAMA

1971Volume 20Issue 1 Pages 29-30
Published: January 15, 1971
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.29

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Irosorb-59 and Its Clinical Application

Teruo GEMBA, Fumiko HARA

1971Volume 20Issue 1 Pages 31-35
Published: January 15, 1971
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.31

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On the Components of Retention in the Pulverized Solid Recoil System

Nagao IKEDA, Osamu KUJIRAI

1971Volume 20Issue 1 Pages 36-37
Published: January 15, 1971
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.36

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Technical Problems in the Use of Radioisotope in Nuclear Medicine

—Radioisotope Imaging—

Eiichi TANAKA

1971Volume 20Issue 1 Pages 38-47
Published: January 15, 1971
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.38

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Rapid Estimation of Thermal Neutron Activation

Minoru OKADA

1971Volume 20Issue 1 Pages 48-51
Published: January 15, 1971
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.48

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Radiation Measuring Instruments (I)

Liquid Scintillation Counters

Tetsuo IWAKURA

1971Volume 20Issue 1 Pages 52-63
Published: January 15, 1971
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.52

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ERRATUM

1971Volume 20Issue 1 Pages e1
Published: 1971
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.1_e1

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[title in Japanese]

1971Volume 20Issue 1 Pages A1115-A668
Published: January 15, 1971
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.20.A1115

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