RADIOISOTOPES

Energy Dependence of Etch Pit Diameter in a CR-39 Detector for α-Particles with the Energy from 1.29 to 5.48 MeV

Nobuhito ISHIGURE, Osamu MATSUOKA

1982Volume 31Issue 9 Pages 447-452
Published: September 15, 1982
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.31.9_447

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The characteristics for α-particle recording of CR-39 plastics was studied for practical use. Sample detectors were irradiated with α-particles at normal incident angle. The energy was varied from 1.29 to 5.48 MeV. Tracks of α-particles could sufficiently be recognized through the etch pit observation with 1 hour etching in 30% solution of NaOH at a temperature of 70°C. The etch pit diameter decreased almost linearly with the energy of α-particles at the early stage of etching, which suggested the possibility of the estimation of α-particle energy. The energy resolution was evaluated from the FWHM of the measured distribution of etch pit diameters and found to be about 1.8 MeV for 1, 2 and 3 hour etching.

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Alpha-spectroscopic Determination of ²¹⁰Pb and ²¹⁰Po in Snow Samples

Tetsuo HASHIMOTO, Shuji MASUMURA, Shigemi KOMATSU, Takeshi SOTOBAYASHI

1982Volume 31Issue 9 Pages 453-458
Published: September 15, 1982
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.31.9_453

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The concentrations of ²¹⁰Pb and ²¹⁰Po in several snow samples were determined using α-spectrometry. After 5l of snow-melt water was subjected to coprecipitation of both nuclides with AlPO₄, the solvent extraction procedure with TBP (tri-butyl phosphate) -isopropyl ether was applied to purify the polonium fraction, followed by the spontaneous electro-deposition on a Ni-sheet. The α-spectrum was measured with a Si (Au) -semiconductor detector coupled with a multichannel pulse-height analyzer. After the first determination of ²¹⁰Po, the concentration of ²¹⁰Pb was estimated from second measurement of ²¹⁰Po grown newly from the remaining Pb-fraction during the storage period of more than 3 months. In these analytical procedures, ²¹²Pb and ²⁰⁸Po tracers were conveniently utilized for the determination of collection yield for ²¹⁰Pb and of the final chemical yield of ²¹⁰Po, respectively. The contents of ²¹⁰Po and ²¹⁰Pb in the fresh snow were 3-30 mBq/l (81-810 fCi/l) and 250-720 mBq/l (6.8-19.5pCi/l), respectively, and the residence time of ²¹⁰Pb was given to be 6-12 days from the decay-growth relationships of both nuclides.

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Distribution of ⁶⁷Ga-citrate in 3'-Methyl-4-dimethylaminoazobenzene-induced Hepatoma of Rats

Seiichiro MORITA, Shigeru KIKUCHI, Fumiaki NISHI, Toshichika OKINAGA, ...

1982Volume 31Issue 9 Pages 459-462
Published: September 15, 1982
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.31.9_459

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The distrubution of ⁶⁷Ga-citrate in the hepatoma of rat induced by 3'-methyl-4-dimethyla-minoazobenzene was studied. ⁶⁷Ga uptake ratio resected specimen, autoradiography and histological specimen were compared each other. ⁶⁷Ga uptake ratio of the tumor was increased 1.6 to 7.2 times (average 4.4) to control group. Regardless of the size of the tumor, macroauto-radiographycally observed distribution of ⁶⁷Ga-citrate in the hepatoma was higher in the peripheral zone than in the central zone. Histologically the degeneration of tumor cell was low or absent in the peripheral zone of tumor, whereas it was intence in the central zone. ⁶⁷Ga-citrate was highly accumulated in the zone which the degeneration was low or absent. We, however, could not demonstrate the site where ⁶⁷Ga-citrate was incorporated.

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Double Tracer Autoradiography of Bone Tumor Using ³H-thymidine and Radionuclides for Diagnostic Purpose

Tohru UMEDA, Osamu MATSUOKA

1982Volume 31Issue 9 Pages 463-468
Published: September 15, 1982
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.31.9_463

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Whole body distribution and accumulation of radionuclide for diagnostic purpose such as ^99mTC-MDP (methylene diphosphonate) , ⁶⁷Ga-citrate (⁶⁷Ga) and ²⁰¹T1-chloride (²⁰¹T1) in implanted osteosarcoma of human origin were evaluated by macroautoradiography of Balb/c nude mouse. ³H-thymidine of which uptake has a close relation to growth pattern of tumors was used for a partner of target nuclide in double tracer technique to examine the distribution characteristics.
Separated distribution pattern of coupled nuclides was imaged by a difference both of half life and energy of radiation between radionuclides. The distribution pattern of each target nuclide and ³H-thymidine were compared to clarify distribution characteristics respectively in specimen. ⁶⁷Ga and ²⁰¹T1 were taken around the tumor and the mode of their distribution was identical to that of ³H-thymidine. Uptake of ⁶⁷Ga in tumor was much higher. ^99mTc-MDP accumulated in the central zone of the tumor and its pattern was quite different from that of ³H-thymidine. From above result it was demonstrated that the accumulation mechanism of ⁶⁷Ga, ²⁰¹Tl and ^99mTc-MDP are quite different in the tumor each other. So we concluded that our method of double tracer technique was useful for evaluation of distribution pattern of radionuclides for diagnostic purpose.

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Influence of Impurities on Radiolysis of Trichloro-fluoromethane

Tadatoshi YAMAMOTO, Norikatsu OOTSUKA

1982Volume 31Issue 9 Pages 469-472
Published: September 15, 1982
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.31.9_469

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Renal Dynamic Imaging and Regional Renograms by ¹²³I-Hippuran

Michio YOSHIDA, Yasuo KUWABARA, Yoshihiko OSHIUMI, Yuichi ICHIYA, Zenj ...

1982Volume 31Issue 9 Pages 473-476
Published: September 15, 1982
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.31.9_473

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Determination of Serum Free Thyroxine Using Amerlex FT₄ Kit

Junta TAKAMATSU, Kiyoshi NAKATA, Keizo FURUKAWA, Toshiji MOZAI, Taeko ...

1982Volume 31Issue 9 Pages 477-479
Published: September 15, 1982
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.31.9_477

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Photosynthetic Carbon Assimilation in C₃- and C₄-plants

—Tracer experiments using ³H, ¹⁴C, ¹³C and ¹⁸O—

Tamiko OH-HAMA

1982Volume 31Issue 9 Pages 480-489
Published: September 15, 1982
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.31.9_480

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Estimation of Uranium, Thorium and Alphaemitters in LSI Constituent Materials

Kiyoshi KUDO, Hiroshi ANAYAMA, Toshio SHIGEMATSU, Shoji HIRAI, Tadashi ...

1982Volume 31Issue 9 Pages 490-499
Published: September 15, 1982
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.31.9_490

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Use of the Stable Isotopes in Life Science (IX)

Detection of Stable Isotopes by NMR

Haruo SETO

1982Volume 31Issue 9 Pages 500-508
Published: September 15, 1982
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.31.9_500

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[title in Japanese]

1982Volume 31Issue 9 Pages A59P-A88M
Published: September 15, 1982
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.31.9_A59P

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