| 摘要 |
A method of tagging a manufactured product with a passive tag includes determining a unique combination of at least two axis ratios. Each axis ratio is an isotopic ratio for a same-species ratio of enriched noble gas isotopes. A gas having the determined unique combination of at least two axis ratios is incorporated into the manufactured product. The product to be tagged may be a first product, characterized by a first particular characteristic. A second product is characterized by a second particular characteristic different from the first particular characteristic. The unique combination of at least two axis ratios is a first unique combination. A second unique combination of at least two axis ratios is determined, with the second unique combination of axis ratios being different from the first unique combination of axis ratios. A gas having the determined second unique combination of at least two axis ratios is incorporated into the second manufactured product.
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