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Volume 24, Issue 4
Displaying 1-11 of 11 articles from this issue
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Katsuhiro KAWASHIMA, Kazuo HOSHINO, Takeshi HIRAOKA, Takashi MARUYAMA, ...1975Volume 24Issue 4 Pages 225-231
Published: April 15, 1975
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSAn International Neutron Dosimetry Intercomparison was carried out at the RARAF at Brookhaven National Laboratory in 1973 under the sponsorship of International Commission on Radiation Units and Measurements. One of the quantities to be intercompared was tissue kerma rate in free air at 30 cm from a 252Cf fission neutron source of about 2 mg.
The measurements were performed to determine not only total tissue kerma rate but also the separate neutron and photon tissue kerma rates by the method of paired chamber techniques. Uncertainties in the determination of dosimetry parameters and tissue kerma rates were estimated.
The total kerma rate in the mixed field of 252Cf source was measured with a cylindrical homogeneous tissue equivalent ionization chamber having a gas volume of about 5 ml.A graphite chamber filled with carbon dioxide of the same size as tissue equivalent chamber's and TL dosimeter using CaSO4 and Mg2SiO4 encapsulated in glass ampoule of 2 mm diameter and 10 mm long were used to estimate the photon tissue kerma rate.
The results for the separate neutron and photon tissue kerma rates were 3.37 rad/h and 1.53 rad/h. The percentage of the photon tissue kerma rate to the total one was 31.2%. These compare with the correspoding mean values estimated by other participants of 3.56 rad/h, 1.67 rad/h and 32.0%.
Neutron tissue kerma rate at 100 cm from the 252Cf source of one gram was calculated of 197 rad/h based on the neutron emission rate of 2.311×1012 s-1⋅ g-1 and the kerma rate factor of 0.0107 (mrad/h) (cm2⋅sec) which was assessed by separating 252Cf neutron spectrum into eleven energy groups according to Stoddard. On the other hand, the neutron tissue kerma rate of 168 rad/h was reduced from the results by present authors.View full abstractDownload PDF (722K) -
Yoshio ONAI, Toraji IRIFUNE, Teizo TOMARU, Isao UCHIDA1975Volume 24Issue 4 Pages 232-234
Published: April 15, 1975
Released on J-STAGE: July 21, 2010
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Toraji IRIFUNE, Yoshio ONAI1975Volume 24Issue 4 Pages 235-237
Published: April 15, 1975
Released on J-STAGE: July 21, 2010
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—From Study Meeting on the Applications of 252Cf—Daido ISHII, Hiroshi TOMINAGA, Nobuo WADA, Toshiaki NOJIRI, Shigemasa ...1975Volume 24Issue 4 Pages 238-248
Published: April 15, 1975
Released on J-STAGE: July 21, 2010
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—From Study Meeting on the Applications of 252Cf—Hiroshi TSUNEMOTO, Yoshio ONAI, Akira TSUYA, Yoichiro UMEGAKI1975Volume 24Issue 4 Pages 249-261
Published: April 15, 1975
Released on J-STAGE: July 21, 2010
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—From Study Meeting on the Applications of 252Cf—Osamu MATSUOKA, Kaoru UENO, Katsuhiro KAWASHIMA, Shigemasa Enomoto, Ma ...1975Volume 24Issue 4 Pages 262-272
Published: April 15, 1975
Released on J-STAGE: July 21, 2010
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Shojiro MATSUURA1975Volume 24Issue 4 Pages 273-280
Published: April 15, 1975
Released on J-STAGE: July 21, 2010
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Kenji YOSHIHARA1975Volume 24Issue 4 Pages 281-289
Published: April 15, 1975
Released on J-STAGE: July 21, 2010
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Sample Preparation Techniques (2)Keiichi KUSAMA1975Volume 24Issue 4 Pages 290-303
Published: April 15, 1975
Released on J-STAGE: July 21, 2010
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1975Volume 24Issue 4 Pages A1530
Published: 1975
Released on J-STAGE: July 21, 2010
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1975Volume 24Issue 4 Pages A1523-A1076
Published: April 15, 1975
Released on J-STAGE: July 21, 2010
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