**Exhibit      No. 31.1**

**Certification      Pursuant to Section 302**

**of      the Sarbanes-Oxley Act of 2002 - **

**Chief      Executive Officer**

|   | 1. | I                have reviewed this report on Form 10-QSB/A for the quarter ended                March 31,                2005 of IsoRay, Inc. (formerly Century Park Pictures                Corporation); |
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|   | 2. |   | Based                on my knowledge, this report does not contain any untrue statement                of a                material fact or omit to state a material fact necessary to make                the                statements made, in light of the circumstances under which such statements                were made, not misleading with respect to the period covered by this                report; |
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|   | 3. |   | Based                on my knowledge, the financial statements, and other financial information                included in this report, fairly present in all material respects                the                financial condition, results of operations and cash flows of the                registrant as of, and for, the periods presented in this                report; |
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| 4. | The                small business issuer's other certifying officer(s) and I are responsible                for establishing and maintaining disclosure controls and procedures                (as                defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the small                business issuer and have: |
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|  | 5. | The                    registrant's other certifying officer(s) and I have disclosed,                    based on                    our most recent evaluation of internal control over financial                    reporting,                    to the registrant's auditors and the audit committee of registrant's                    board                    of directors (or persons performing the equivalent                    functions): |
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| Date:              May              12, 2006 | By:                                                     | /s/              Roger Girard |
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|                                         | Roger                GirardChief                Executive Officer |

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