LOCK-UP AGREEMENT FOR ANTHONY SILVERMAN

This Lock-Up Agreement (the “Agreement”) is between Century Park Pictures Corp. (“Century Park”) and the undersigned Shareholder of Century Park.

Whereas Century Park has entered into a Merger Agreement dated May 27, 2005 with IsoRay Medical, Inc., a Delaware corporation (“IsoRay”), Century Park Transitory Subsidiary, Inc., a Delaware corporation, and certain shareholders; and

Whereas the Merger Agreement requires as a condition of IsoRay’s obligation to close that Mr. Silverman execute an agreement not to sell certain of the Century Park shares he will retain (the “Century Park Shares”) into the public market, therefore

In Consideration of the Century Park Shares to be retained by the Shareholder upon the closing of the merger, Century Park and its undersigned Shareholder, with respect to the Century Park Shares to be retained by the Shareholder,

Agree As Follows: