Exhibit 5.1 LOAN AGREEMENT THIS LOAN AGREEMENT ("Agreement") is made and entered into as of the _____ day of October, 1998 by and between Texas State Bank ("Lender") and International Isotopes Inc., a Texas corporation ("Borrower"). R E C I T A L S...Loan Agreement • October 26th, 1998 • International Isotopes Inc • In vitro & in vivo diagnostic substances • Texas
