| Autor: |
Kiyoshi, Koizumi, Kazutaka, Masuda, Kiyoko, Kusakabe, Fujimi, Kinoshita, Kazumi, Kobayashi, Tetsuo, Yamamoto, Shinichi, Kanaya, Tetsuo, Kida, Masamichi, Yanagisawa, Tetsuo, Iwanaga, Hideharu, Ikebuchi, Keiji, Kusama, Nobuo, Namiki, Hiroshi, Okuma, Yoko, Fujimura, Akiko, Horikoshi, Mamoru, Tanaka |
| Rok vydání: |
2005 |
| Předmět: |
|
| Zdroj: |
Kaku igaku. The Japanese journal of nuclear medicine. 41(4) |
| ISSN: |
0022-7854 |
| Popis: |
To explore the possibility of which medical radioactive wastes could be disposed as general wastes after keeping them a certain period of time and confirming that their radioactivity reach a background level (BGL), we made a survey of these wastes in several nuclear medicine facilities. The radioactive wastes were collected for one week, packed in a box according to its half-life, and measured its radioactivity by scintillation survey meter with time. Some wastes could reach a BGL within 10 times of half-life, but 19% of the short half-life group (group 1) including 99mTc and 123I, and 8% of the middle half-life group (group 2) including 67Ga, (111)In, and 201Tl did not reach a BGL within 20 times of half-life. A reason for delaying the time of reaching a BGL might be partially attributed to high initial radiation dose rate or heavy package weight. However, mixing with the nuclides of longer half-life was estimated to be the biggest factor affecting this result. When disposing medical radioactive wastes as general wastes, it is necessary to avoid mixing with radionuclide of longer half-life and confirm that it reaches a BGL by actual measurement. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
