RADIOISOTOPES

Simple Method for Producing ¹³NN and ¹⁵OO by Proton Bombardment of Aqueous Phase

Ren IWATA, Kazutoshi SUZUKI, Tatsuo IDO, Kazuhiko TAMATE, Kikuo YOSHIK ...

1978Volume 27Issue 10 Pages 563-567
Published: October 15, 1978
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_563

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A simple method has been developed for the production of ¹³NN and ¹⁵OO by proton irradiation of aqueous solutions. 90 mCi of ¹³NN was obtained in a 200 ml of He by using 1.0M NH₄Cl solution at pH 11 as the target with 10 min irradiation of 15 MeV, 10 μA protons. 80 mCi/min of ¹⁵OO was continuously obtained in a 200 ml of O₂ by using pure water as the target with 40 MeV, 2μA protons. The radiochemical purity of these short-lived radioactive gases obtained by this method was >99.9% by passing through a single absorber.

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Effect of Addition of Inorganic Acids or Alkalis on Gelation of Polyvinyl Alcohol Aqueous Solution by γ-Ray Irradiation

-Color Development with lodine-

Hisatake NARASAKI

1978Volume 27Issue 10 Pages 568-571
Published: October 15, 1978
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_568

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Below the critical concentration of polyvinyl alcohol, the effect of inorganic acids or alkalis on gelation of polyvinyl alcohol aqueous solution was investigated by color development with iodine after γ-ray irradiation. The absorbances of the polyvinyl alcohol-iodine complex decreased remarkably in the presence of nitric or perchloric acid. These acids decompose and form oxygen or hydrogen peroxide which oxidize the polymer and leads to a fading of the color. On addition of sulfuric, phosphoric and hydrochloric acids, the absorbances decrease in the order that agrees with that of the acidity of these acids at the same molarity. In the alkaline solution the absorbances decrease by the addition of sodium hydroxide and aqueous ammonia in the order that agrees with that of the basicity of these alkalis. These results indicate that the gel formation is caused by. the radiolysis of water. As a result of chemical analysis, these additives are considered not to be attached to the polymer.

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A Multi-Crystal Coincidence Positron Camera

Norimasa NOHARA, Takehiro TOMITANI, Eiichi TANAKA, Hideo MURAYAMA, Tad ...

1978Volume 27Issue 10 Pages 572-578
Published: October 15, 1978
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_572

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A large area multi-crystal positron camera has been constructed for diagnostic investigations with cyclotron-produced short-lived positron emitters. The camera has two identical opposing detectors each consisting of a square array of 14×14 small NaI (Tl) crystals (20 mmφ×38 mm) viewed by an array of 112 photomultiplier tubes (38 mmφ) . The detectors have a useful area of 39×39 cm². The electronic system is simplified by grouping the photomultiplier timing signals into each row and each column in the tube array. The fast coincidence operation between the detectors is performed with the grouped signals in row-row and column-column mode, and finally each crystal is in coincidence with 25 crystals in the opposite detector to form 4096 coincidence crystal pairs in total.
The system processes the coincidence data which are stored in one of two 4K word-18 bit IC memories, and offers a 64×64 digital image focused on a plane between the detectors on a CRT monitor during and after the data acquisition. The camera has the spatial resolution of 8 mm (FWHM) at the midplane and the uniformity of the sensitive field is ±7%. The variation of sensitivity in the direction perpendicular to the detector plane is less than 1%. The efficiency of the camera is about 18 cps/μCi for a 15×15 cm² plane source in air with a detector separation of 50 cm. The data rate of the system reaches about 120 kcps at the maximum, but image distortion is observed at the coincidence rate more than about 30 kcps. An estimation indicates that only a few percent increase in accidental coincidence rate is resulted from the coincidence operation in the row-row and column-column mode.

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Quantification of Right-to-Left Shunting in Cyanotic Heart Disease by Isosensitive Scanning

Hikaru SETO, Masamichi MATSUDAIRA, Kinichi HISADA

1978Volume 27Issue 10 Pages 579-583
Published: October 15, 1978
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_579

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A new method for the quantification of shunting is discussed experimentally and clinically. Following quantitative injection of ^99mTc-MAA to a patient in a supine position, whole body counting was obtained by summing up the counts of linear scanning with our Medical Universal Human Counter. For linear scanning, two detectors with a slit-field collimator are placed symmetrically above and two below the table. The table of the scanning bed was moved automatically along the longitudinal axis at the speed of 40 cm/min. Isoresponse curves of this system in air and chest phantom were made with a window of 140 keV±2%. Whole body linear scanning was performed with the same window in the patients with cyanotic heart diseases.
Mean transmission rate (MTR) of ^99mTc-MAA from the lung was calculated in healthy subjects. Good correlation was obtained between ln (MTR) and chest thickness (X) of the subjects (γ=-0.95, p<0.001) . Linear regression was ln (MTR) =-0.035X+0.024 Absorption of γ-rays in the chest was corrected by multiplying 1/MTR
Right to left shunt rate was calculated as follows:
R to L shunt rate=N₀-N_a/MTR/N₀×100 (%)
N₀: Counts of the administered dose in air
N_a: Counts of the lung in the whole body linear scan
MTR: Mean transmission rate in the patient
Good correlation between linear scan method and cardiac catheterization was noted. This method is safe and can be simply performed at rest and even though on exertion.

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An Evaluation of Inhalation and Perfusion Scintigraphy with ^81mKr

Teruyasu SUZUKI, Yasushi ISHII, Yoshiharu YONEKURA, Daizaburo HAMANAKA ...

1978Volume 27Issue 10 Pages 584-589
Published: October 15, 1978
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_584

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As ^81mKr is a radioactive noble gas which has a very short half-life of 13 seconds, it leads no environmental contamination in a laboratory room. Because of its low radiation dose in the human body, it had many merits in routine tests of the inhalation and perfusion scintigraphy, which were very useful extremely in infants, old men and severe patients in need of cooperation.
The studies with ^81mKr were, either, useful as a load test, since these could repeatedly readily, evaluate the ventilation and perfusion dynamics before and after administration of drugs and show the distribution of the ventilation and perfusion correspond to the various lung volume level.

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Effect of Addition of an Inorganic Acid of Alkali on Gelation of Polyvinylpyrrolidone Aqueous Solution by γ-Ray Irradiation

Hisatake NARASAKI

1978Volume 27Issue 10 Pages 590-591
Published: October 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_590

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Apparatus for Decontamination of the Urine after Radioiodine Treatment of Thyroid Cancer

Hiyoshimaru OYAMADA

1978Volume 27Issue 10 Pages 592-594
Published: October 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_592

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Radiation Dose from Skin Contamination with ^99mTc

Hirofumi MORI, Kazuhiko KOJIMA, Kichiro KOSHIDA, Atsushi ANDO, Shin KO ...

1978Volume 27Issue 10 Pages 595-597
Published: October 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_595

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Radiation Exposure and Contamination of Personnel's Hands in Handing Unshielede Radioisotope ^99mTc

Hisashi MAEKOSHI, Takeo ORITO, Hiroshi SAITO, Kunihide NISHIZAWA, Ken ...

1978Volume 27Issue 10 Pages 598-601
Published: October 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_598

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†Monitoring of ³H Surface Contamination Using ³H/¹⁴C Surveymeter

Hirofumi MORI, Ryohei AMANO, Yoko KIKUTA, Atsushi ANDO, Kinichi HISADA

1978Volume 27Issue 10 Pages 602-604
Published: October 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_602

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Evaluation of AMICON MC-40 Ultrafiltration System for the Measurement of CEA by Z-gel Method

Reiko Chida, Daijiro Tsujino, Yasuhito Sasaki, Kazuhiko Someya

1978Volume 27Issue 10 Pages 605-608
Published: October 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_605

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Clinical Evaluation of Hepatobilialy Scan with Tc-99m-Pyridoxylideneisoleucine

Mutsumi FUJIOKA, Tatsuya MIYAMAE, Yoshito TONARIYA

1978Volume 27Issue 10 Pages 609-612
Published: October 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_609

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Practical Techniques of Activation Analysis to Agricultural and Biological Samples (V)

(4) Activation Analysis of the Elements in Soil Materials (2), Halogen Elements

Kouichi YUITA

1978Volume 27Issue 10 Pages 613-623
Published: October 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_613

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[title in Japanese]

1978Volume 27Issue 10 Pages A1859-A1360
Published: October 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.10_A1859

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