All issues
Volume 20, Issue 3
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
Tetsuo MAMURO, Yatsuka MATSUDA, Akira MIZOHATA, Takayuki TAKEUCHI, Aki ...1971Volume 20Issue 3 Pages 111-116
Published: March 15, 1971
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSInstrumental neutron activation analysis by γ-ray spectrometry with a high resolution Ge (Li) detector followed by spectrum analysis with an electronic computer was applied to elemental analysis of a river water sample which was collected in a river water into which pour liquid wastes from a tungsten mine, and the concentrations of 31 elements were determined. Among the elements there were some metallic elements which are regarded as important from the view point of environmental pollution, such as Cd, As, Sn and Cr; it was thus confirmed that such instrumental neutron activation analysis is quite useful for elemental analysis of polluted river water. The Presence of U was found by detecting 239Np. Fluorescence X-ray analysis revealed the presence of Mo and Sr, but the concentrations of these two elements could not be determined by the present activation analysis. In this study we attempted to determine concentrations of as many elements as possible, not limiting to heavy metallic elements. The information on the concentrations of many elements will be useful when comparing the elemental compositions of different river water samples with one another and attempting to realize the characteristic quality of a polluted river water, and therefore may be expected to provide basic data for establishing long term counter-plans against river water pollution.View full abstractDownload PDF (584K) -
Tetsuo MAMURO, Yatsuka MATSUDA, Akira MIZOHATA, Takayuki TAKEUCHI, Aki ...1971Volume 20Issue 3 Pages 117-123
Published: March 15, 1971
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSInstrumental neutron activation analysis by γ-ray spectrometry with a high resolution Ge (Li) detector followed by data processing with an electronic computer was applied to elemental analysis of airborne dust samples which were collected at four stations selected in Osaka district, and atmospheric concentrations of more than thirty elements; Na, Al, Cl, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, As, Se, Br, Rb, Ag, Cd, In, Sb, Cs, Ba, La, Ce, Sm, Eu, Yb, Lu, Hf, Ta, W, Au, Hg and Th, were found to be determinable. Airborne dust was continuously collected on a membrane filter of 4.7 cm in diameter and 1.2 e in pore size during a month, and average concentrations in the atmosphere in the month were determined. Descriptions are made on preparation of the dust specimens and the standard reference specimens for irradiation, the radionuclides and their γ-ray energies which were used for the determinations and examples of observational results. On comparison of the concentrations of each element at the four stations with one another, it was found that there seemed to exist some characteristic trends in relative concentrations of several elements at the four stations. It is thus proposed that measurement of atmospheric concentrations of as many elements as possible at many more stations provides an effective aid for grasping the situation of air pollution in a heavily polluted area, even though not all the analyzed elements are hazardous to public health.View full abstractDownload PDF (757K) -
Hiroshi SAITO, Atsushi MISHIMA1971Volume 20Issue 3 Pages 124-126
Published: March 15, 1971
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSUIBC was determined rapidly by using a new simple device consists of an outer test tube, which is also used for counting, and an inner tube having a rubber piston ring, which has a sponge or cotton filter inside the ring.
The serum and ferric ammonium citrate 59FeFe solution are added and incubated for 15 minutes in the outer tube.
Amberlite IRP-67 ion exchange resin powder is added to the iron serum solution mixture, and kept for one minute. Thereafter the inner tube is inserted and pushed down. Then the serum solution appears above the filter and the resin remains under the piston ring. The serum solution is removed and the resin is washed with water three times in a minute by pushing and pulling the inner tube. The washed resin in the tube is counted in a well-type scintillation counter. In reverse, if the resin is added onto the piston ring and the inner tube is removed, the serum solution for counting is obtained.
The use of this device enables the rapid determination of UIBC without the procedures as pipetting, centrifugation, and mixing.View full abstractDownload PDF (307K) -
Shigeru TANAKA, Yoshio MOCHIZUKI, Toru UCHIKAWA, Teruko YAMANE1971Volume 20Issue 3 Pages 127-133
Published: March 15, 1971
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSRecently, attempts were made by several radiologists to employ various kinds of ferrite as contrast materials for the X-ray diagnosis of gastrointestinal lesions. Some of them seem to offer advantages over barium sulfate due to their desirable characteristics for the contrast material and their magnetic properties.
In this report, the solubility of 59Fe, 54Mn and 65Zn labelled ferrite (MnO·ZnO·2Fe2O3) in HCl solution (pH2.0, 0.01M) or in veronal buffer (pH8.6, 0.05M) was examined, in order to estimate their solubility in digestive juices. The solubility of ferrite was negligible in HCl solution (pH2, 0), as well as in veronal buffer (pH8.6) .
Further experiments were carried out on the fate of ingested ferrites in rats by the measurements of total body retention and the tissue distribution of ferrites. Orally administered ferrites in rats were almost completely excreted in feces within 7 days after the administration, and the tissue distribution of ferrites was negligible.View full abstractDownload PDF (700K) -
Kenji SAEGUSA, Hirotake KAKEHI1971Volume 20Issue 3 Pages 134-141
Published: March 15, 1971
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSLow energy gamma emitters with short physical half lives are useful as scanning agents, because a larger amount of radioactivity can be applied to a patient without raising radiation dose to a possible hazard, and the shielding effectiveness for gamma rays will increase. A good quality scintigram, having less background can not be always obtained in organ scintigraphy. The reason being is that low energy gamma rays produce a larger amount of the scattered rays than those of the medium energies over 200 keV.
For the measurements of scattered rays, eight nuclides energies ranging from 30 to 412 keV, as thyroid and liver-phantoms, were prepared. The fraction of scattered rays in a photo peak was determined by the ratio of the area of the “scattered region” to that of the photo peak, which is found in the window of±10%.
The fraction of scattered rays was higher in 197Hg and lower in 203Hg. In 131I, however, the fraction was a little higher than 203Hg, because of the gamma rays penetration of the collimator septa.
The best energy of the gamma rays used in scanning was found in 250 keV from the view point of the shielding effectiveness and the incidence of the scattered rays.View full abstractDownload PDF (6175K) -
Takeshi TOMINAGA1971Volume 20Issue 3 Pages 142-149
Published: March 15, 1971
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (1071K) -
Gammaray Spectrometers (2) The Pulse-height Analyzers and AccessoriesSetsuro KINBARA1971Volume 20Issue 3 Pages 150-163
Published: March 15, 1971
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (1544K) -
1971Volume 20Issue 3 Pages A1131-A684
Published: March 15, 1971
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (3725K)
- |<
- <
- 1
- >
- >|