RADIOISOTOPES

Coprecipitation of Manganese with Calcite and Aragonite between 15°C to 50°C

Tetsu KUMAGAI, Masakzu MATSUI

1989 Volume 38 Issue 1 Pages 1-6
Published: January 15, 1989
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.38.1

JOURNAL FREE ACCESS

Show abstractHide abstract

The distribution of manganese between precipipates of calcium carbonates, calcite and aragonite, and saturated aqueous solutions has been measured at 15, 25, 40 and 50°C. Calcite was precipitated from a calcium bicarbonate solution and aragonite was precipitated from a solution which contained magnesium perchlorate. Both systems obeyed the logarithmic distribution law, and distribution coefficients, λ were calculated by using the ratio of solubility product constants K_aragonite/K_{rhodochrosite}=291 at 25°C. Partition coefficient, λ_cai.=23.9, λ_arag.=0.102, excess free energy between ideal solid solution and real solid solution, Δ, _μdcal.=5.40 kJ mol^-1 and Δ_μarag.=19.7 kJ mol^-1, were obtained. Differences of two excess free energy values is caused by the fact that rhodochrosite and calcite both belong to hexagonal system, but aragonite belongs to the rhombic one.

View full abstract

Download PDF (613K)
Double Tracer Whole Body Autoradiography Using a Short-lived Positron Emitter and a Long-lived β Emitter

Tachio SATO, Takehiko FUJIWARA, Yoshinao ABE, Masatoshi ITOH, Hiroshi ...

1989 Volume 38 Issue 1 Pages 7-12
Published: January 15, 1989
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.38.7

JOURNAL FREE ACCESS

Show abstractHide abstract

We investigated glucose and amino acid metabolism in tumors and other organs using whole body autoradiography with a short-lived positron emitter and a long-lived β emitter. The radioactive compounds used were 2-deoxy-2- [¹⁸F]-fluoro-D-glucose (¹⁸F-FDG) with a half life of 109.8 min and L- [methyl-¹⁴C]-methionine (¹⁴C-MET) with a half life of 5730 years.
A Donryu rat weighing about 150 g was subcutaneously inoculated at the back with experimental tumors of AH 109A and AH 272.74 MBq (2 mCi) of ¹⁸F-FDG and 740 kBq (20μCi) of ¹⁴C-MET was administered and after 30 min, the rat was sacrificed. Whole body frozen sections were obtained using autocryotome. For the ¹⁸F-FDG autoradiogram, the frozen sections were exposed to an X-ray film for 6 h. After seven days, these frozen sections were again exposed to ¹⁴C-MET for a week. Cross-contamination was minimized by adjusting the exposure time, the interval of exposures and the administered dose.
The accumulation of the tracers was represented as the optical density ratio of the tissue of interest to the muscle. The tumor ratios were 12.5 for ¹⁸F-FDG and 8.6 for ¹⁴C-MET showing the highest accumulation in the whole body autoradiogram. In contrast the inflammatory tissue ratios were 1.27 for ¹⁸F-FDG and 0.77 for ¹⁴C-MET showing very low amino acid metabolism. With the present double tracer whole body autoradiogram, ¹⁸F-FDG accumulation was seen in the brain and the heart but not to the liver as against ¹⁴C-MET accumulation which was seen to the liver but not to the brain and the heart.

View full abstract

Download PDF (4109K)
The Correlation of Serum Parathyroid Hormones among Patients with Dementia of Vascular Type, Hemodialysis, and Bone-joints Disorders

Masayuki YASUI, Ichiro YANO, Kazuo MITANI, Kazutami TORIZUMI, Miho MAE ...

1989 Volume 38 Issue 1 Pages 13-19
Published: January 15, 1989
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.38.13

JOURNAL FREE ACCESS

Show abstractHide abstract

PTH levels were analysed in sera of the parients with receiving the maintenance hemodialysis, the vascular type of dementia and the orthopedics patients with bone-joints disorders, using PTH assay kits. There were the significant interrelationship among all kinds of PTH levels in the hemodialysis patients, but not in patients with the vascular type of dementia and the bone-joints disorders which renal functins might be responsible for fragmentation of PTHH in blood stream. This results suggested that the measurement of PTH levels needed to examine various kinds ofamino-sequence of PTH levels in keeping normal function of kidney.

View full abstract

Download PDF (531K)
Direct Determination of ²²²Rn Concentration in Natural Water Using Liquid Scitilliation Counting Technique

Takao NAKAGAWA, Osamu SATO, Tetsuo HASHIMOTO

1989 Volume 38 Issue 1 Pages 20-23
Published: January 15, 1989
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.38.20

JOURNAL FREE ACCESS

Show abstractHide abstract

A simple and reliable method for the determination of ²²²Rn concentration in natural water using a liquid scintillation counting technique was investigated.
Water sample (50ml) containing ²²²Rn was directly mixed into emulsive liquid scintillator (50 ml), followed by the spectrometric measurements by a multichannel pulse height analyzer coupled to a low background liquid scintillation counter.
Weak quenching effect due to the increase of water fraction and the ionic constituents did not bother the determination of low-level ²²²Rn concentration because the liquid scintillationspectrometry could easily distinguish the alphaparticle spectrum even in quenched samples. Since the present procedure is not necessary for the correction of the recovery yield of ²²²Rn, the experimental error included is very small in comparison with the widespread extraction method of ²²²Rn with organic solvent. The detection limit of ²²²Rn concentration was estimated to be about 74 mBq/l (triple the standard deviation of background counting) in a fixed counting time of 100 min.

View full abstract

Download PDF (517K)
Pre-treatment for Incineration of Emulsive Liquid Scintillator Waste Containing ³²P, ³⁵S and ⁴⁵Ca by Salt Out Technique

Syojiro KIMURA, Meiko TAIMATSU

1989 Volume 38 Issue 1 Pages 24-27
Published: January 15, 1989
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.38.24

JOURNAL FREE ACCESS

Show abstractHide abstract

In order to incinerate the emulsive liquid scintillator waste containing ³²P, ³⁵S and ⁴⁵Ca, application of demulsion by salt out technique for pre-treatment had been experimentally investigated.
As the results, it was obtained that about 99% of aqueous content was removed from the liquid waste and their viscosities were being less than 5 cP.
Then, more than 95% of radioactivities of the above nuclides were simultaneously removed together with aqueous content, by using 4 M NaCl and 3 M (NH₄) ₂CO₃ as salt out reagents for the liquid scintillator wastes containing inorganic labeled compounds such as KH₂³²PO₄, H₂³⁵SO₄ and ⁴⁵CaCl₂, and organic labeled compounds such as ³²P-ATP and ³⁵S-methionine respectively.
Still, as other common conditions for demulsion, it was found that suitable factors were mixing time of 2 min and temperature of 40-50°C.

View full abstract

Download PDF (522K)
Proton Therapy

Tetsuo INADA

1989 Volume 38 Issue 1 Pages 28-39
Published: January 15, 1989
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.38.28

JOURNAL FREE ACCESS

Download PDF (2764K)
Introduction to the Experiments of Genetic Engineering XIV. Gene expression of cloned genes in mammalian cells

Dai AYUSAWA

1989 Volume 38 Issue 1 Pages 40-49
Published: January 15, 1989
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.38.40

JOURNAL FREE ACCESS

Download PDF (4732K)
[title in Japanese]

1989 Volume 38 Issue 1 Pages A1P-A10M
Published: January 15, 1989
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.38.A1P

JOURNAL FREE ACCESS

Download PDF (3344K)

Register with J-STAGE for free!