| 摘要 |
<p>The object i.e. ball (10), has radioactive isotopes for detecting the object by a radioactivity detector (5) e.g. Geiger counter, during crossing of a game line e.g. goal line such as vertical tangency line (7), where the isotopes are formed by carbon, cesium, strontium, iron, cadmium, iodine and sulfur. Any portion (12) of the object represents 0.5% of volume of the object, where the portion is obtained by a section of the object through a plane. Independent claims are also included for the following: (1) a radioactivity detector (2) a goal frame.</p> |
