RADIOISOTOPES

Development of a 2-Dimensional Gamma Ray Position Sensitive Detector for PET

Seiichi YAMAMOTO, Hidehiro IIDA, Shuichi MIURA, Iwao KANNO

1996Volume 45Issue 4 Pages 229-235
Published: April 15, 1996
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.229

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A 2-dimensional gamma ray position sensitive detector was developed and tested which capable of obtaining desirable distribution of position response by selecting the area of painting reflector of BGO for PET. The results show performance of the detector is well enough to use for high resolution PET in both axial and in-plane direction with 3-dimensional acquisition capability.

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Investigation of Hydrogen Behavior in an Fe-Cr-Ni Alloy

Seigoroh YAMAMOTO, Minoru MORI

1996Volume 45Issue 4 Pages 236-245
Published: April 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.236

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Fe-Cr-Nialloy which is subjected to use in a nuclear reactor should be influenced by hydrogen produced by nuclear reaction in theFe-Cr-Nialloy and hydrogen in the reactor coolant water. The behavior of the hydrogen in a radiation damagedFe-Cr-Nialloy is not well understood. By investigating hydrogen behavior by using the tritium tracer technique, it was confirmed that the diffusible hydrogen inFe-Cr-Nialloy was diffused out in dioxane solution and in deionized water at 283 K, but the hydrogen captured into radiation damaged structure was not diffused out at 283 K and the content of the remained hydrogen was estimated to be approximately 5 molppm. Due to the measurement of tritium activity, it is estimated that the hydrogen captured in the structure diffused out at the rate of 0.1 molppm·s^-1 by isothermal heating at 323 K for 5000 s. It is found that almost all the hydrogen captured in the radiation damaged structure will be diffused out if it is heated in helium atmosphere by isochronal heating up to 1000 K, and that the estimated hydrogen desorption activation energy of the radiation damaged structure is about 53 kJ·mol^-1.

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¹⁴C Specific Activity of Farm Products and Marine Products Collected from the Rokkasho Area in Aomori Prefecture

Takeshi MURANAKA, Kazuya HONDA

1996Volume 45Issue 4 Pages 246-248
Published: April 15, 1996
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.246

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We investigated¹⁴Cspecific activity of farm products and marine products which were collected from the Rokkasho area in Aomori prefecture from 1988 to 1990. The measured¹⁴Cspecific activity of farm products was almost equal to one another with the averaged¹⁴Cspecific activity of 0.261 (Bq/g·C) .
On the other hand, ¹⁴Cspecific activity of marine products was slightly lower than those of farm products. Especially that of squid was the lowest among studied marine products. This may be due to the low¹⁴Cspecific activity of the sea water surrounding squid.

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Evaluation of a New Tumor Marker, CYFRA 21-1, in Patients with Primary Lung Cancer

Tsuyoshi YOSHIDA, Yuichi ICHIYA, Yasuo KUWABARA, Masayuki SASAKI, Sada ...

1996Volume 45Issue 4 Pages 249-253
Published: April 15, 1996
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.249

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We measured the level of serum CYFRA 21-1 (CYFRA) in 38 primary lung cancer patients (21 adenocarcinomas (A Cs), 12 squamous cell carcinomas (SqCCs) and 5 small cell carcinomas (SmCCs) ) before undergoing therapy using a “CYFRA immunoradiometric assay kit”. We thus determined the CYFRA cut-off level to be 1.7 ng/ ml. We also measured both the carcinoembryonic antigen (CEA), and the squamous cell carcinoma antigen (SCC) levels. The positive rate for CYFRA in patients with lung cancer was 71% and such positivity was related to their histology (SqCCs, SmCCs 100% ; ACs 48%) . The level of CYFRA was significantly higher in SgCCs than in either ACs or SmCCs. No significant differences were observed in the serum CYFRA value among the various clinical stages. In addition, no significant correlation was seen between CYFRA and SCC, or between CYFRA and CEA. Among the various clinical stages of SqCCs, the positive rate of CYFRA was higher in the early clinical stages than in SCC. Our findings therefore support the usefulness of CYFRA as a marker of SqCCs.

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Biodosimetry VII. Postscript

Yoshiro AOKI

1996Volume 45Issue 4 Pages 254-255
Published: April 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.254

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VIII. Explanation of Terms

1996Volume 45Issue 4 Pages 256-266
Published: April 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.256

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Technical Study on Treatment and Disposal of Radioactive Wastes from the Use of Radioactive Materials

Committee of Technical Study on Treatment and

1996Volume 45Issue 4 Pages 267-275
Published: April 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.267

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[title in Japanese]

[in Japanese]

1996Volume 45Issue 4 Pages 277-278
Published: April 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.277

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[title in Japanese]

[in Japanese]

1996Volume 45Issue 4 Pages 279-280
Published: April 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.279

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[title in Japanese]

[in Japanese]

1996Volume 45Issue 4 Pages 281-282
Published: April 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.281

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[title in Japanese]

[in Japanese]

1996Volume 45Issue 4 Pages 283-284
Published: April 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.283

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