| 主权项 |
1. A method of determining whether a sample paper product has been marked in a discrete portion by a functionality-altering dose of irradiation, the method comprising:
(a) irradiating a discrete portion of a paper product with accelerated particles at a dose of irradiation sufficient to alter the functionality of the discrete portion of the paper, thereby providing a marked paper product; and (b) utilizing a technique selected from the group consisting of infrared spectroscopy (IR), atomic force microscopy (AFM), chemical force microscopy (CFM), or electron spin resonance (ESR), and combinations thereof, comprising:
(i) determining the functionality of a corresponding discrete portion of a sample paper product and(ii) comparing the discrete portions of the sample paper product and the marked paper product thereby determining whether the sample paper product has been marked in the same manner as the marked paper product, using the marked paper product as a control. |
