(2) Strontium-90 and Cesium-137 in Air-Borne Dust
(Japan Chemical Analysis Center)
The levels of strontium-90 and cesium-137 in air to which both some carriers and hydrochloric acid borne dust have been determined by Japan Chemical were added, was destroyed under heating. The so Analysis Center under the contact with Science and lution was dissolved into hydrochloric acid and filtered, Technology Agency. after it was added with nitric acid and heated to dry Dust samples were collected at 1.0 ~ 1.5m above ness. The filtrate was analysed for strontium-90 and the ground surface with electrostatic precipitators or cesium-137 using the method recommended by Science on filter papers by each prefectural public health and Technology Agency.* laboratories and institutes in 9 prefectures, and these Results obtained are shown in Table. 2. And the samples were forwarded to Japan Chemical Analysis sampling locations are shown in Figure 2. Center after the carbonization. These samples were asked in an electric muffle furnance at Japan Chemical Analysis Center. The ask See the appendix. (P. 43 )
Table 2. 90Sr and 137Csin Air-Borne Dust -Apr., 1975 to Mar., 1976- (Japan Chemical Analysis Center) (Continued from Table 2, No. 40 of this publication)
Absoiption 90 r 137Cs Location Sampling period S volume (m3) (10'3 1 pCi/m3) (10"' ' pCi/m9)
Okuma, FUKUSHIMA 05-06/75 13169 1.0 ± 0.04 1.7 ± 0.06 Mito, IBARAKI 04-06/75 11232 0.30 ± 0.03 0.26 ± 0.03 Niigata, NIIGATA 04-06/75 13000 0.29 ± 0.02 0.93 ± 0.05 Fukui, FUKUI 04-06/75 15850 0.36 ± 0.02 0.68 ± 0.03 Shizuoka, SHIZUOKA 06/75 10020 0.57 ± 0.03 1.1 ± 0.06
Nagoya, AICHI 05-06/75 17583 1.6 ± 0.04 2.6 ± 0.06 Osaka, OSAKA 04-06/75 7776 0.92 ± 0.05 1.5 ± 0.07 Tottori, TOTTORI 04-06/75 5698.5 1.6 ± 0.07 2.8 ± 0.11 Hiroshima, HIROSHIMA 04-06/75 10200 1.3 ± 0.05 1.9 ± 0.07 Nagasaki, NAGASAKI 04-06/75 7100 1.6 ± 0.07 2.9 ± 0.1
Okuma, FUKUSHIMA 07-09/75 10682 0.21 ± 0.02 0.38 ± 0.04 Mito, IBARAKI 07-09/75 12096 0.04 l 0.02 0.10 ± 0.03 Niigata, NIIGATA 07-09/75 1300O 0.08 ± 0.02 0.22 ± 0.03 Fukui, FUKUI 07-09/75 8300 0.36 ± 0.03 0.60 ± 0.05 Shizuoka, SHIZUOKA 09/75 10054.2 0.13 ± 0.02 0.16 ± 0.03
Nagoya, AICHI 07-09/75 17429 0.27 ± 0.02 0.44 ± 0.03 Osaka, OSAKA 07-09/75 11016 0.32 ± 0.03 0.47 ± 0.04 Tottori, TOTTORI 07-09/75 6347.4 0.27 ± 0.Q3 0.51. ± 0.06
(12) Absorption 90Sr 137Cs Location Sampling period 3 3 volume (m ) (10 •' pCi/:m' ) (10- pCi/im 3)
Hiroshima, HIROSHIMA 07-09/75 10800 0.10 ± 0.02 0.16 ± 0.03 Nagasaki, NAGASAKI 07-09/75 7800 0.3 ± 0.03 0.4 ± 0.04 Okuma, FUKUSHIMA 10-12/75 17172 0.14 ± 0.02 0.23 ± 0.02 Mho, IBARAKI 10-12/75 9504 0.1 ± 0.02 0.1 ± 0.02 Niigata, NIIGATA 10-12/75 12000 0.1 ± 0.01 0.2 ± 0.03
Fukui, FUKUI 10-12/75 6588 0.3 ± 0.03 0.6 ± 0.05 Shizuoka, SHIZUOKA 11-12/75 11880 0.1 ± 0.02 0.2 ± 0.03 Nagoya, AICHI 10-12/75 39511 0.2 ± 0.01 0.3 t 0.01 Osaka, OSAKA 10-12/75 7776 0.2 ± 0.02 . 0.3 t 0.04 Tottori, TOTTORI 10-12/75 7053.3 0.3 ± 0.03 0.5 t 0.05
Hiroshima, HIROSHIMA 10-12/75 10800 0.1 ± 0.02 0.3 ± 0.03 Nagasaki, NAGASAKI 10-12/75 6600 0.2 ± 0.03 0.4 t 0.05 Okuma, FUKUSHIWA 01-0V76 12251 0.1 ± 0.02 0.2 ± 0.03 Mito, TBARAKI 01-03/76 17208 0.1 ± 0.01 0.1 ± 0.02 Niigata, NIIGATA 01-03/76 1*000 0.1 ± 0.02 0.2 ± 0.02
Fukui, FUKUI 01-03/76 12214 0.4' ± 0.02 0.8 t 0.04 Shizuoka, SHIZUOKA 03/76 10644 0.2 ± 0.02 0.4 ± 0.03 Nagoya, AICHI 01-03/76 31279 0.3 ± 0.01 0.7 ± 0.02 Osaka, OSAKA 01-03/76 8424 0.2 ± 0.02 0.6 ± 0.05 • Tottori, TOTTORI 01-03/76 12291 0.5 ± 0.02 0.9 ± 0.04
Hiroshima, SHIROSHIMA 01-03/76 10800 0.1 ± 0.01 0.1 ± 0.02 Nagasaki, NAGASAKI 01-03/76 7350 0.5 ± 0.03 1.0 ± 0.06
(13) Figure 2. 90Sr and 137Cs in Air-Borne Dust - April, 1975 to March, 1976 - (Japan Chemical Analysis Center)
1. Okuma 2. MHo 3. Nilgata 4. Fukui 5. Shizuoka 6. Nagoya 7. Osaka _ ,45°N 8. Tottorl 9. Hiroshima 10. Nagasaki
135°
SEA OF JAPAN 6 130° V a
PACIFIC OCEAN o0 0 100 200km i 1 I 30° (14)