| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1992: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Research Abstract |
PURPOSE Thallium (Tl) is highly toxic, therefore, they quitted using it as the medical treatments, in secticides or redenticides. REcently, Tl is given attention as a material for semiconductors or advanced composites. Our main purpose of this study is to know the fate of Tl in animal bodies.
METHODS Male mice at 6 week old started drinking water containig 0.2 to 20 ppm Tl for 1 or 3 weeks. The other mice received single administration of 50 mumol Tl/kg directly to stomach. The other mice were given Tl by combination of drinking water and oral injection. One, 3, 7, 22, or 43 days after cessation of Tl intake, mice were sacrificed and almost all organs, blood, contents in gastro-intestinal tract, urine, and feces, 20 items per mouse were kept for Tl determination.
RESULTS AND DISCUSSION 1. Every kind of analytical specimen contained Tl. 2. Disappearance of Tl from each organ was relatively rapid after cessation of Tl intake. Wehn low dose was supplied, Tl concentrations in organs were 1/2 after 3 days, and 1/10 after 1 week. 3. Tl excretion into urine was 10 - 30%, and 35-60% or total amount ingested. 4. The highest Tl concentration was found in bone and showed the slowest attenuation. 5. Tests, submandibular gland, and gastrointestinal tracts showed high affinity to Tl. 6. Tl concentration in hair had positive correlation with Tl dose administered. 7. The activities of serum GOT, Al-P, and blood ALAD were not affected by Tl.
CONCLUSION Tl invading into body orally distributes almost all organs. Disappearance of Tl from organs was relatively fast. Body hair is useful for biological monitoring.
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