| 摘要 |
The invention concerns a method, a device and a system for applying a detectable temporary mark of predefined life time of minutes to hours onto an object ( 0 ). The invention also concerns a coating composition comprising a short-lived radioactive isotope and the use of a short-lived radioactive isotope as a temporary marking. The temporary mark is applied to the object (O) by the means of a coating composition ( 3 ) comprising a low level of a short-lived radionuclide, generated in situ from a longer-lived precursor nucleus. The marking device comprises a radionuclide generator ( 1 ), a reservoir ( 2 ) for the in situ preparing the radioactively marked printing ink, and an ink-jet or alike printing or spraying head ( 8 ), preferably of the dropon-demand type. The marking is preferably detected and identified by a gamma-radiation counter. The invention claims also a system for the temporary marking of an object (O) with a radioactive isotope of predefined life time of minutes to hours, in view of performing an operation on the marked object (O) at a later point in time. |
