All issues
Volume 25, Issue 8
Displaying 1-15 of 15 articles from this issue
- |<
- <
- 1
- >
- >|
-
Hiroshi MIYAHARA, Makoto YOSHIDA, Tamaki WATANABE1976 Volume 25 Issue 8 Pages 437-442
Published: August 15, 1976
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSA gold deposited VYNS film as a source backing in the 4πβ-counting has been used in general for reducing the absorption of β-rays. The thickness of gold is usually larger than that of a VYNS film by a few times. However, the appropriate thickness of gold has not been definite yet. So, the effects o f gold thickness on electrical resistivity, plateau characteristics and β-ray counting efficiency were studied. As the sources, 198Au (960 keV ), 60Co (315 keV ), 59Fe (273 keV) and 95Nb (160 keV ), which were prepared by the aluminium chloride treatment method, were used. Gold was evaporated under a deposition rate of 1-5 μg/cm2/min at a pressure less than 1×10-5 Torr. Present results show that the gold deposition on the opposite side of the source after the source preparation is essential. In this case, a maximum counting efficiency is obtained at the mean thickness of 2μg/cm2. When gold is deposited only on the same side of the source, a maximum counting efficiency, which is less than that in the former case, is obtained at the mean thickness of 20 μg/cm2.View full abstractDownload PDF (709K) -
Kiyoshi IWASHIMA, Masahiko FUJITA, Noboru YAMAGATA1976 Volume 25 Issue 8 Pages 443-447
Published: August 15, 1976
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSAerosols in 1-2 m3 air collected on a membrane filter was irradiated together with arsenic standard and copper flux monitor by neutron flux 2.1×1012 n⋅cm-2⋅sec-1 for 10 hrs. After cooling for 24 hrs, 74As-spike (596.0 keV), arsenate and bromide carriers were added. The mixture was wet-asked and arsenic chloride was extracted with benzene, then the sulfide was separated by a homogeneous precipitation method. Interferences from 82Br (554.3 keV) and 122Sb (563.9 keV) were removed by decontamination and 559.4 keV photo-peak of 76As was measured by γ-spectrometry. Over-all chemical yield was 50-70%, and detection limit was 0.5 ng (error±10%) . Urban ambient air in Japan usually contained 5-10 ng⋅m-3 arsenic.View full abstractDownload PDF (432K) -
Osamu ITO, Tadakatsu YONEYAMA, Yoko AKIYAMA, Kikuo KUMAZAWA1976 Volume 25 Issue 8 Pages 448-453
Published: August 15, 1976
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSThe method to determine the 15N abundance in amino acids and amides, which were separated by thin layer chromatography, was examined. It was found that the previous method, in which silica gel was introduced into the discharge tube, made the serious error in the determination because of the heavy contamination of nitrogen from silica gel. The simple method was designed in order to avoid this contamination by burning silica gel at 560°C for 3 hours and washing away amino acids and amides with 50% ethanol from silica gel. This method diminished the contamination of nitrogen up to 1/5 of the previous method. The 15N abundance in amino acids and amides isolated from plant tissues was determined by this method, and consequently it was made clear that this method was superior to the previous method.View full abstractDownload PDF (705K) -
—Investigation of the Error in Analyzing 133Xe Clearance Curve—Yuko MIURA, Kazuo UEMURA, Iwao KANNO1976 Volume 25 Issue 8 Pages 454-460
Published: August 15, 1976
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSOur system for measurement of regional cerebral blood flow (rCBF) by Cerebrograph Model 165 and a small digital computer, and some observation about problems on the analysis of the 133Xe clearance curve were reported.
The regional wash out of 133Xe in the brain was measured every second by 16 scintillation detectors of the Cerebrograph. The data collected by the Cerebrograph were fed into the computer which was required with a core memory of 8K 20-bit words, a 32 KW magnetic drum and a magnetic tape.
Flow value of each region and a hemisphere were evaluated by the height over area method and the initial slope method. The data analyzed by computer were printed out corresponding with the position of each detector. In addition to numerical data, the initial parts of logarithmic clearance curves of individual regions were displayed on a CRT for visual information.
In the analysis of the 133Xe brain clearance curve, one of the difficulties was how to determine the starting point (H0) of appeared at initial part of the curve over the brain with major cerebral vessels and to reduce statistical errors, three kinds of our analytical techniques, such as initial exclusion method, extrapolation method and integration method, were considered. The performances of those techniques were studied using digital model method which was reported previously by us. In the conclusion, the extrapolation method thought to give the best results for the data analysis of a multidetector system as the Cerebrograph Model 165.View full abstractDownload PDF (4272K) -
—A New Method for Quantitative Evaluation for Combined Scintigraphy—Masayoshi AKISADA, Sanshin HAYASHI1976 Volume 25 Issue 8 Pages 461-468
Published: August 15, 1976
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSIn a evaluation of 111In-BLM as a tumor-imaging agent, both fundamental and clinical studies were performed.
The radiochemical purity of the complex was assayed by paper chromatography and no more than 1.0% of the free radionuclide was recovered. Rf values of 111In-BLM was between 0.7 and 0.9.
The in vivo stability of the complex was ascertained by thin-layer-chromatography of urine.
The blood clearance, ratio of plasma to whole blood of 111In-BLM and cummulative excretion curves of urine and stool was studied.
The blood clearance curve showed that the first half time was 16 minutes and more than 90% of the administered activity was cleared from the circulating blood in two days. Ratios of plasma activity to the whole blood was almost constant in 100 hours after injection.
Urinary and fecal excretion showed that 80% of the administered activity was excreted in 24 hours, mainly in the urine and below 1.0% in the feces.
There appeared to be an inverse relationship between urinary and fecal excretion. The effective and biological half time of the liver, heart, bone marrow at the level of L4 and spleen were obtained by counting activities externally using probes located at each corresponding site.
The activity at the bone marrow and heart showed rather short effective half time. The clinical usefulness of 111In-BLM as a tumor imaging agent was evaluated in 19 patients, with 12 malignancy and 7 benign lesions in Mitsui Memorial Hospital. Each study by 111In-BLM was combined with 67Ga-citrate scintigrams.
A new method for comparative analyses between two radio pharmaceuticals without using computer was reported here, as comparative evaluation by naked eyes was difficult to determine. Clinical experience to date seems to be encouraging to the detection of malignancy, although some benign tumors showed marked uptake of 111In-BLM.View full abstractDownload PDF (7359K) -
Tsuneo SASAKI1976 Volume 25 Issue 8 Pages 469-473
Published: August 15, 1976
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSThe cases studied were 538 cases of non-pancreatic diseases, and 276 cases of pancreatic diseases.
The imaging rate of normal pancreas was about 90.0%. Twenty-five cases of 64 chronic pancreatitis cases were normally imaged the entire pancreas, but 25 cases were not imaged entirely. Most cases with calcification in the pancreas were not imaged entirely. Thirteen cases of pancreatic cyst showed the defect in the corresponding region. Thirty seven cases of 45 pancreas head cancer cases showed defect in the corresponding region and 8 cases failed to show the image of the pancreas. Twenty seven cases of 32 pancreas body and tail cancer cases showed the defect in the corresponding region and 6 cases failed to demonstrate the image of pancreas. Five cases of 7 papilla Vateri cancer cases showed the normal pancreas. The rate of correct diagnosis were 82.2% in the head, 84.4% in the body and tail, and 71.4% in the papilla Vateri.View full abstractDownload PDF (4425K) -
Yukio KIHO1976 Volume 25 Issue 8 Pages 474-480
Published: August 15, 1976
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSAttempts are made to treat the organic scintillation liquid wastes containing radioactive molecules (labelled with 3H, 14C, or 32P) . These radioactive molecules in such fluids are difficult to be caught on adsorbents, probably because they are dissolved or emulsified into organic solvents by complex means. By addition of saline to the scintillation fluid, white creamy sol is formed. Emulsion thus made is destroyed by warming. After standing, two layers are clearly separated. The upper layer is mainly nonpolar organic solvent holding hydrophobic molecules and the lower layer is mainly water containing hydrophilic molecules. Two layers can then be separately treated with charcoal to adsorb radioactive molecules easily.
Tritium water (HTO) can be transferred from organic scintillation fluid (monophase) into water layer. The latter can be used for the treatment of fresh mono phase repeatedly. Thus HTO in a large amount of mono phase can be concentrated into a small volume of water layer.View full abstractDownload PDF (862K) -
Kunio TAKEI, Hitoshi HAGIWARA1976 Volume 25 Issue 8 Pages 481-483
Published: August 15, 1976
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (358K) -
Hiroshi KIRITA, Tetutaro HONDA, Toshimasa KIMURA, Hiroshi HAMAGUCHI1976 Volume 25 Issue 8 Pages 484-486
Published: August 15, 1976
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (330K) -
Masamichi TAKAGI1976 Volume 25 Issue 8 Pages 487-498
Published: August 15, 1976
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (1742K) -
Hiroshi WAKITA, Hiroshi HAMAGUCHI1976 Volume 25 Issue 8 Pages 499-503
Published: August 15, 1976
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (452K) -
Committee on Test of Transport Packaging for1976 Volume 25 Issue 8 Pages 504-511
Published: August 15, 1976
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (5907K) -
Detection of 13C-tracers by NMR Spectroscopy and Its Application (1)Haruo SETO1976 Volume 25 Issue 8 Pages 512-521
Published: August 15, 1976
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (1049K) -
1976 Volume 25 Issue 8 Pages e1
Published: 1976
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (15K) -
1976 Volume 25 Issue 8 Pages A1651-A1202
Published: August 15, 1976
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (3623K)
- |<
- <
- 1
- >
- >|