0001158957-10-000037 Sample Contracts

SECURITIES PURCHASE AGREEMENT
Securities Purchase Agreement • February 25th, 2010 • International Isotopes Inc • Industrial instruments for measurement, display, and control • New York

This Securities Purchase Agreement (this "Agreement") is dated as of February 24, 2010 among International Isotopes Inc., a Texas corporation (the "Company"), and the purchasers identified on the signature pages hereto (each, a "Purchaser" and collectively, the "Purchasers").

CONVERTIBLE DEBENTURE DUE August 24, 2011
Convertible Security Agreement • February 25th, 2010 • International Isotopes Inc • Industrial instruments for measurement, display, and control • Idaho

THIS CONVERTIBLE DEBENTURE is one of a series of duly authorized and validly issued Convertible Debentures of International Isotopes Inc., a Texas corporation (the "Company"), designated as its Convertible Debenture, due August 24, 2011 (this debenture, the "Debenture" and collectively with the other such series of debentures, the "Debentures").