CHATSWORTH, Calif.--(BUSINESS WIRE)--North American Scientific, Inc. (Nasdaq:NASI) announced today the closing on January 18, 2008 of a private placement of shares of its common stock and the concurrent issuance of warrants for the purchase of common stock. The Company has received gross proceeds of $15.5 million from the financing which will be used for continued development of ClearPath™, the Company’s breast brachytherapy device, as well as working capital.