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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 935b8dlS9ggv0rPEqf0K0A==

<SEC-DOCUMENT>0001342647-06-000019.txt : 20061206
<SEC-HEADER>0001342647-06-000019.hdr.sgml : 20061206
<ACCEPTANCE-DATETIME>20061206181559
ACCESSION NUMBER:		0001342647-06-000019
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20061206
FILED AS OF DATE:		20061206
DATE AS OF CHANGE:		20061206

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IsoRay, Inc.
		CENTRAL INDEX KEY:			0000728387
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		IRS NUMBER:				411458152
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		350 HILLS STREET,
		STREET 2:		SUITE 106
		CITY:			RICHLAND
		STATE:			WA
		ZIP:			99354
		BUSINESS PHONE:		(509) 375-1202

	MAIL ADDRESS:	
		STREET 1:		350 HILLS STREET,
		STREET 2:		SUITE 106
		CITY:			RICHLAND
		STATE:			WA
		ZIP:			99354

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CENTURY PARK PICTURES CORP
		DATE OF NAME CHANGE:	19920703

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Boatwright Stephen
		CENTRAL INDEX KEY:			0001333158

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14247
		FILM NUMBER:		061260983

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		602-230-6361

	MAIL ADDRESS:	
		STREET 1:		3101 NORTH CENTRAL AVENUE
		STREET 2:		SUITE 900
		CITY:			PHOENIX
		STATE:			AZ
		ZIP:			85012-2600
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-12-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000728387</issuerCik>
        <issuerName>IsoRay, Inc.</issuerName>
        <issuerTradingSymbol>ISRY.OB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001333158</rptOwnerCik>
            <rptOwnerName>Boatwright Stephen</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3101 NORTH CENTRAL AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 900</rptOwnerStreet2>
            <rptOwnerCity>PHOENIX</rptOwnerCity>
            <rptOwnerState>AZ</rptOwnerState>
            <rptOwnerZipCode>85012-2600</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-12-06</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>24236</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>4.81</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>see footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Held by a company controlled by Mr. Boatwright.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Stephen R. Boatwright</signatureName>
        <signatureDate>2006-12-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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