RADIOISOTOPES

Separation of Carrier-free ²⁰⁶Bi from ²⁰⁶pb Target

Mariko INARIDA, Akira SHIMAMURA

1969Volume 18Issue 11 Pages 485-487
Published: November 15, 1969
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.18.11_485

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Separation of carrier free ²⁰⁶Bi from the ²⁰⁶Pb target bombarded by 19 MeV deuteronparticles obtained from the 160-cm IPCR cyclotron was studied. The bombarded lead nitrate (enriched²⁰⁶Pb (NO₃) ₂) was dissolved in 0.1 M nitric acid and 0.2 M oxine-TBP was added, and the two phases were mixed well by one minute shaking. The carrier free ²⁰⁶Bi was separated by extraction with 0.2M oxine-TBP and then back-extracted into conc. HNO₃.The recovery efficiency was about 95%. A carrier free ²⁰⁶Bi with sufficiently high radiochemical purity was obtained by this simple procedure.

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Choice of Activable Tracer for Spraying Agricultural Insecticides by Helicopter

Shoji BANDO, Hiroshi TOMINAGA, Yutaka KAWAKAMI, Muneaki SENOO

1969Volume 18Issue 11 Pages 488-493
Published: November 15, 1969
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.18.11_488

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The fundamental studies were made on the selection of activable tracers which were usable to examine the distribution of agricultural insecticide sprayed by helicopter.
Considering the conditions that the samples are organic substances, sufficiently strong radioactivity should be produced in a short irradiation-time, and the half life of the activity is desired to be longer than two hours for the sake of convenience of activity measurement, manganese, gold and europium were selected as typical tracers. Other conditions required for the field experiments were checked on these elements. Minimum detectable limits of each tracer was estimated from both the activity produced by each tracer and the background due to interference components in the sample. As a result, europium tracer was found to be the best in sensitivity (minimum detectable limit was 1.5×10^-10gEu/5cm²filter paper) and also in cost, if the sampling was carried out using filter paper and a thin scintillator was used to measure low energy photons. After all, it was concluded that europium would be the most suitable tracer for the determination of distribution of insecticide sprayed by helicopter.

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Kinetics of Peritoneal Dialysis—The Relationship between Flow Rate and Peritoneal Urea Clearance—

Akira UENO, Akimi OGAWA, Hisao TAKAYASU

1969Volume 18Issue 11 Pages 494-499
Published: November 15, 1969
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.18.11_494

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The rate constants of transperitoneal movement of urea in the peritoneal cavity were determined using¹⁴C-urea on six adult patients. It is considered that one half of the time consumed by the inflow and outflow of the solution is indifferent to intermittent peritoneal dialysis, and this length of time is defined as ineffective time. Peritoneal urea clearance can be expressed as a function of the dialysate flow rate, the ineffective ective time and the rate constant determined by this experiment. Optimal flow rate for various values of ineffective time can be estimated. To increase the efficiency of peritoneal dialysis, it it essentially important to shorten the ineffective time and also it is desirable to increase the dialysate flow rate to an optimal point which is dependent on the ineffective time in individual cases. When an intermittent peritoneal dialysis was performed using a litre of a solution per cycle, 28.4 minutes were required on an average for the inflow and outflow of the solution in the series of peritoneal dialyses. In order to obtain the maximum efficacy when one litre solution is used for one cycle, it is desirable that one cycle, from the beginning of the inflow to the end of the outflow, is completed in about 40 minutes.

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The Measurement of Beta Activities in Aqueous Solution Utilizing Cerenkov Effect by Means of Liquid Scintillation Counters

Tetsuo IWAKURA

1969Volume 18Issue 11 Pages 500-505
Published: November 15, 1969
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.18.11_500

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Use of Commercially Available Nonionic Surfactants as Emulsifying Agents in Liquid Scintillation Counting for Aqueous Samples of Low Level Tritium

Tetsuo IWAKURA, Aiko MAEBAYASHI, Yosihiko KASIDA

1969Volume 18Issue 11 Pages 506-509
Published: November 15, 1969
Released on J-STAGE: December 13, 2010

DOIhttps://doi.org/10.3769/radioisotopes.18.11_506

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese]

1969Volume 18Issue 11 Pages 510-526
Published: November 15, 1969
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.18.11_510

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[title in Japanese]

P. MARTINELLI

1969Volume 18Issue 11 Pages 527-531
Published: November 15, 1969
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.18.11_527

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[title in Japanese]

[in Japanese]

1969Volume 18Issue 11 Pages 532-534
Published: November 15, 1969
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.18.11_532

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[title in Japanese]

[in Japanese]

1969Volume 18Issue 11 Pages 534-539
Published: November 15, 1969
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.18.11_534

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[title in Japanese]

[in Japanese]

1969Volume 18Issue 11 Pages 539-544
Published: November 15, 1969
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.18.11_539

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[title in Japanese]

1969Volume 18Issue 11 Pages A1003-A568
Published: November 15, 1969
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.18.11_A1003

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