RADIOISOTOPES

Analysis of Isotope Separation Factor for Adsorption of Tracer-HTO/Bulk-H₂O on Cobalt Complex [Co (en) ₃] Cl₃ Based on Ideal Adsorbed Solution Theory

Kenji KOTOH, Hiromitu NAONO, Kazuhiko KUDO

1998Volume 47Issue 3 Pages 197-205
Published: March 15, 1998
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.197

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The isotope separation factor for adsorption of tracer-HTO/bulk-H₂Oon tris (ethylenediamine) cobalt complex [Co (en) ₃] Cl₃is analyzed in accordance with the ideal adsorbed solution theory by using the isotherms for pure-component adsorption ofH₂OandD₂O.It has been studied that the isotherms are composite which result from two types of adsorption of water molecules on primary and secondary coordination sites in the complex crystal. The separation factorβshows two of high and low plateaus which respectively correspond to the primary adsorption where the equilibrium pressure exhibits a plateau and the secondary adsorption where the pressure rises up to the saturated vapor pressure. The high plateauβis larger thanα, the relative volatility ofH₂OtoHTO.On the other hand, the low plateauβis smaller thanα.In this paper, approximate equations are presented for estimating the plateausβwith respect to temperature.

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Propose of Novel Annihilation Model of Positronium for the Relation between o-Ps Lifetime and Bigger Pore Size than-1 nm

Kenji ITO, Hiroshi NAKANISHI, Yusuke UJIHIRA

1998Volume 47Issue 3 Pages 206-211
Published: March 15, 1998
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.206

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A new equation is proposed which correlates ortho-positronium (o-Ps) lifetime (τ) to the pore radius bigger than -l nm, by introducing quantum radius of positronium (R_ps) .We assume that the annihilation rate of o-Ps in nano-pores is dependent on the fraction of the two different annihilation processes; o-Ps annihilated in free space (-140 ns) and by pick-off reaction with anti parallel spin electron extruded from spherical wall. The annihilation late, λ_hole (=1/τ_hole), in nano-pores is assumed to be expressed by the following equation.
λ_holo= {λ^R_2γ=2 [1-R/R+ΔR+1/2_πsin (2_πR/R+ΔR) ] (f (R≤0)
λ_3γf (R) +λ^R_α_2γ (1-f (R) ) (f (R>0)
where λ_3γ=1/140, R_a=R_Ps-ΔR, f (R) = (R-R_a/R+ΔR) ^b.

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Rapid Sample Preparation for ¹⁴C Dating by Using Direct Reaction of Carbonized Sample and Lithium Metal

Takeshi MURANAKA, Kazuya HONDA

1998Volume 47Issue 3 Pages 212-215
Published: March 15, 1998
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.212

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In¹⁴Cdating by LSC system, benzene is usually synthesized from collected samples via several chemical reactions such as pretreatment, carbonization, combustion, carbonating, carbide production, acetylene generation and polymerization. Since a great deal of efforts is required to the sample preparation, we proposed an another rapid process where the carbonized samples reacted to melted lithium metal directly to produce lithium carbide.
Although the yield generating acetylene gas from carbonized samples was low, 52.5±1.5% on average, the yield synthesizing benzene from acetylene was 90% or more in the successive process. Some impurity atoms contained in carbonized samples deteriorate apparently the yield generating acetylene but they did not influence the yield synthesizing benzene from acetylene. This shows that combustion is not indispensable process in¹⁴Csample preparation.
¹⁴Cages for the samples prepared by the proposed method were agreed to those for the same samples prepared by the conventional method within the age variation corresponding to the statistical error of 1σ.Therefore the fractionation effect of carbon isotopes may be low, if any, in the proposed process. Since this method does not contain combustion and the following carbonating process, the sample preparation is fairly shortened.

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The Measurement of ⁴⁵Ca Using “Ready Cap” Solid Scintillator Developed for Utilization in the Liquid Scintillation Counter

Kaeko MUROTA, Yoshitaka HITOMI, Teruo KAWADA, Tohru FUSHIKI, Sakihito ...

1998Volume 47Issue 3 Pages 216-221
Published: March 15, 1998
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.216

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We studied the performance of“Ready Cap”solid scintillator developed for the liquid scintillation counter, by using ⁴⁵Ca which is usually employed to deduce intracellular signaling by the tracer method. The liquid scintillators“AQUASOL-2”and“ATOMLIGHT”were used for comparison. Our findings were as follows: (1) A high counting efficiency of over 90% was achieved with the wide range of 200 to 10⁶ dpm, (2) measurement errors due to the uneven resolution of the solid scintillator and/or due to contents such as biological high polymers causing a hindrance in scintillation process were revealed to be low at below 5.3%, and (3) minimal effects were observed on (1) and (2) above even when actual samples containing biological high polymers and cell extracts with biopolymers detergent agent were used. We conclude that the solid scintillator studied here is practically enough useful for liquid scintillation measurement required in biological experiments.

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XVIII. Recent Development of Nuclear Radiation Measuring Techniques for Use in Radiological Protection

2. Pulse Shape Analysis and Its Application to the Measurement for Radiation Controle and Protection

Jun KUWABARA, Isamu SHIMIZU, Yukio OHYAMA, Shigekazu USUDA, Chizuo MOR ...

1998Volume 47Issue 3 Pages 222-232
Published: March 15, 1998
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.222

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III. Measurement by Synchrotron Radiation

2. XAFS

Toshiaki OHTA

1998Volume 47Issue 3 Pages 233-239
Published: March 15, 1998
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.233

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3. Auger Electron Spectrometry

Yuji BABA

1998Volume 47Issue 3 Pages 240-247
Published: March 15, 1998
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.240

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4. Soft X-Ray Photoelectron Spectroscopy

Masaharu OSHIMA

1998Volume 47Issue 3 Pages 248-257
Published: March 15, 1998
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.248

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5. Extreme Ultraviolet Spectrometry

Kenji ITO

1998Volume 47Issue 3 Pages 258-263
Published: March 15, 1998
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.258

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6. Packaging Materials

Masakazu FURUTA

1998Volume 47Issue 3 Pages 264-280
Published: March 15, 1998
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.264

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[title in Japanese]

[in Japanese]

1998Volume 47Issue 3 Pages 281-282
Published: March 15, 1998
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.281

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[title in Japanese]

[in Japanese]

1998Volume 47Issue 3 Pages 283-284
Published: March 15, 1998
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.283

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[title in Japanese]

[in Japanese]

1998Volume 47Issue 3 Pages 285-286
Published: March 15, 1998
Released on J-STAGE: December 13, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.285

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[title in Japanese]

[in Japanese]

1998Volume 47Issue 3 Pages 287-289
Published: March 15, 1998
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.47.287

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