| 摘要 |
FIELD: production of paper protected from counterfeit, in particular, protection from counterfeit of banknotes, bonds, checks, tickets, documents and other valuable kinds of paper by constant checking of their authenticity. ^ SUBSTANCE: method involves providing uniform introduction into paper of microelement additives in the form of compounds of alkaline elements of Li, Rb, Cs as protection means; controlling presence of counterfeit protection means including analysis of mass of secondary ions forced out from paper by primary charged particle beam, i.e., accomplishing elementary and isotopic analysis at high localization making up to 0.1 micron; introducing microelement additives throughout the volume, over surface or into paper. ^ EFFECT: increased extent of protecting valuable papers from counterfeit and efficiency in controlling the presence of protection means. ^ 5 cl, 1 ex |
