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Kaneaki SATOH, Naoto TAKANO, Yoshiaki IMAZAWA, Hideo HIGUCHI, Masayasu ...
1983 Volume 32 Issue 1 Pages
1-6
Published: January 15, 1983
Released on J-STAGE: September 07, 2010
JOURNAL
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A simple method for determining the peak efficiency including self-absorption correction, which is applicable to the gamma-ray spectrometry of bulk environmental samples, has been developed.
For a particular photon energy, an equation for the difference between the counting efficiency of a cylindrical standard source of height H and that of a sample of identical size mounted at the same position on the end cap of a Ge detector (Δε (H) =εS (H) -ε (H) ) has been derived asΔε(
H)=
D2⋅ε
0/
H∫
0H1-
e(μS-μ)h/(
h+
D)
2dhwhere, ε
0 is ε
S(0)
; D is a distance from the effective center of the detector to the bottom surface of the source; μ
S and μ
are linear attenuation coefficients of material of the standard source and the sample, respectively. ε
0 and D are determined graphically or by the least square method using an empirical linear relation of 1/ε
S (
H)
and H.
The validity of the proposed equation has been verified over an energy interval of 88 and 1292 keV by the experiment where were used various simulated environmental samples of up to H=5 cm covering the density range from 0.195 to 2.45 g/cm3, and an aqueous 137Cs
solution standard.
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Kunio MIMURA, Shigeo BABA
1983 Volume 32 Issue 1 Pages
7-12
Published: January 15, 1983
Released on J-STAGE: September 07, 2010
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Studies on in vivo percutaneous absorption of Paeonol (2-hydroxy-4-methoxyacetophenone: I) in rabbits, guinea pigs, and rats were carried out by a radioactive tracer technique.
Hydrophilic ointment (specific activity: 376 Bq (0.01016, μCi) /mg) containing 1 [carbonyl-14C]
was applied for 24 h by occlusive dressing treatment on the shaven back of experimental animals. Then, the 14C
-activity in urine, which is the dominant excretion route, was determined for 8 days.
Percentage excreted within 24 h after application to rabbits, guinea pigs, and rats were 42.8%, 46.5%, and 52.0%, respectively, Urinary metabolites were identified as 2, 5-dihydroxy-4-methoxyacetophenone, resacetophenone, and substrate I in all the case.
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Hiroaki HOSHI, Sachiko NAKAYAMA, Takao KODAMA, Seishi JINNOUCHI, Kiyos ...
1983 Volume 32 Issue 1 Pages
13-17
Published: January 15, 1983
Released on J-STAGE: September 07, 2010
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Serum ferritin levels were studied in 264 patients who were consisted of 153 patients with various malignant neoplasms and 111 patients with various benign diseases. Positive rate of serum ferritin in all patients with malignant neoplasms was 35%. Hepatomas and pulmonary cancer showed relatively high positive rate, respectively 65% and 42%. In patients with benign diseases, hepatic diseases showed the high positive rate (52%) and the other benign diseases was low positive rate (11%) . The relationship between serum ferritin and cr fetoprotein in patients with hepatomas and other liver diseases was low. And the relationship between serum ferritin and CEA (carcinoembryonic antigen) in patients with malignant neoplasms of gastrointestinal tract was also low. It seemed that the measurement of serum ferritin levels will be of low value in the diferenciation of the patients with malignant neoplasms.
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Katsuaki KAMETANI, Toshiro MATSUMURA
1983 Volume 32 Issue 1 Pages
18-21
Published: January 15, 1983
Released on J-STAGE: September 07, 2010
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The 238U,
234U,
226Ra
and 228Ra
concentrations in the spring waters at the Sanbe and Misasa districts in Japan were investigated. In the spring water at Sanbe, high concentrations of the natural nuclides described above were found in which the maximum levels of 238U
and 234U
were 0.44 Bq/l and 0.91 Bq/l, respectively, while 234U/
238U
showed the range of 1.50-2.37. The maximum levels of 226Ra
and 228Ra
were found to be 1.95 Bq/l and 0.76 Bq/l, respectively, while 228Ra/
226Ra
mean value was 0.49. In the spring water at Misasa, the maximum levels of 226Ra
and 228Ra
were 0.60 Bq/l and 0.41 Bq/l, respectively, and 228Ra/
226Ra
mean value was 0.55. From the above-mentioned result and the fact that 228Ra
is a decayed product of 232Th,
it is thought that the rocks of the Sanbe and Misasa districts contain much uranium and thorium.
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Yoshihiko MIZUMOTO, Shiro IWATA
1983 Volume 32 Issue 1 Pages
22-25
Published: January 15, 1983
Released on J-STAGE: September 07, 2010
JOURNAL
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The Ca/P atomic ratios of synthesized calcium-hydroxyapatite (Ca
10 (PO
4)
6 (OH)
2)
were determined by neutron activation analysis. In order to obtain calibration curves, the standard samples, such as calcium monohydrogenphosphate, calcium dihydro-genphosphate, etc., were prepared. γ
and β
ray spectra, and β ray intensities of calcium-hydroxy-apatite and standard samples irradiated with reactor neutrons were measured by using a Ge (Li)
detector, a low background β
ray spectrometer and GM detector. Based on these results, deviation coefficient of the calibration curve,
accuracy of the Ca/P
atomic ratio, minimum determination limit, etc. were compared in detail.
From the present analysis, the Ca/P
atomic ratio of calcium-hydroxyapatite was able to obtain with the standard deviation of about 2% for 1 mg sample.
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Yasuo KUWABARA, Yoshihiko OSHIUMI, Yuichi ICHIYA, Makoto WADA, Hiroshi ...
1983 Volume 32 Issue 1 Pages
26-29
Published: January 15, 1983
Released on J-STAGE: July 21, 2010
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Isao KANAMORI, Sadao MATSUO, Tokuji KIMURA, Hideo ICHIKAWA, Chizuko HI ...
1983 Volume 32 Issue 1 Pages
30-33
Published: January 15, 1983
Released on J-STAGE: July 21, 2010
JOURNAL
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Takahisa HIRAISHI, Kyoichi FUJII, Issei KOGA, Haruhiko HARAJIMA
1983 Volume 32 Issue 1 Pages
34-37
Published: January 15, 1983
Released on J-STAGE: July 21, 2010
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Isao KANAMORI, Sadao MATSUO, Chizuko HIGUCHI, Mikiko YANASE, Hideo ICH ...
1983 Volume 32 Issue 1 Pages
38-41
Published: January 15, 1983
Released on J-STAGE: July 21, 2010
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Kenji SODA, Toshihisa OHSHIMA, Nobuyoshi ESAKI
1983 Volume 32 Issue 1 Pages
42-52
Published: January 15, 1983
Released on J-STAGE: July 21, 2010
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1983 Volume 32 Issue 1 Pages
A1P-A10M
Published: January 15, 1983
Released on J-STAGE: July 21, 2010
JOURNAL
FREE ACCESS