| Number | Date | Country | Kind |
|---|---|---|---|
| 63-313499 | Dec 1988 | JPX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 907066 | Loewenthal et al. | Dec 1908 | |
| 1239227 | Saubermann | Sep 1917 | |
| 1839270 | Senftner | Jan 1932 | |
| 1859904 | Wichmann | May 1932 | |
| 1991934 | McCray | Feb 1935 |
| Number | Date | Country |
|---|---|---|
| 47-25358 | Oct 1972 | JPX |
| 48-97356 | Dec 1973 | JPX |
| Entry |
|---|
| CRC Handbook of Chemistry and Physics, 59th Edition, 1978-1979, pp. B-418-B-427. |
| Faires and Parks, "Radioisotope Laboratory Techniques", 1973, pp. 12, 53-55, and 68. |