UNITED STATES 

NUCLEAR REGULATORY COMMISSION 

WASHINGTON, D.C. 20555-0001

TO: Users of Devices Subject to General License Registration 

SUBJECT: ANNUAL REGISTRATION OF GENERALLY LICENSED DEVICES

The U.S. Nuclear Regulatory Commission (NRC) requires annual registration of certain devices that are 

possessed under the general license issued in Section 31.5 of Title 10 U.S. Code of Federal Regulations 

(10 CFR 31.5). Devices subject to registration include those containing the radioactive material and 

activity listed in Table 1 of the attached NRC Form 664. You are receiving this notice because NRC 

records indicate that you have one or more such devices. Information about the general license 

registration program is available NRC website at 

http://www.nrc.gov/materials/miau/miau-reg-initiatives/gen-license.html. 

Note that under 10 CFR 31.5(c)(11), the attached General Licensee Registration Package must be 

completed, signed, and returned to the NRC within 30 days from the date of this letter. Read all of the 

instructions prior to completing the package. Mail the completed package in the enclosed envelope to:

Director, Office of Nuclear Material Safety 

and Safeguards 

ATTN: Document Control Desk/GLTS 

U.S. Nuclear Regulatory Commission 

Washington DC 20555-0001

Registration Fee: Commission regulations (10 CFR 170.31, Category 3Q) require that you submit a 

registration fee with each registration on an annual basis. The registration fee is subject to change yearly, 

and you are required to submit the fee that is in effect as of the date of this letter. An invoice for the 

current amount due will be sent to you under separate cover. If you have any questions about the fee or 

the invoice, please contact the License Fee Billing Help Desk at (301) 415-7554 or email at 

fees.resource@nrc.gov.

NRC amended 10 CFR Parts 170.11 and 170.31 to provide that 10 CFR Part 170 fees be assessed to 

Federal agencies, where applicable, in accordance with the Energy Policy Act of 2005. Therefore, those 

Federal facilities required to register certain generally licensed devices in their possession will be required 

to pay the annual registration fee.

Attachment: NRC Form 664 -- General Licensee Registration and Instructions

Sincerely, 

U.S. Nuclear Regulatory Commission 

Office of Nuclear Material Safety 

and Safeguards 

Division of Materials Safety, Security, State, 

and Tribal Programs 

Materials Safety and Tribal Liaison Branch
INSTRUCTIONS FOR COMPLETING NRC FORM 664 

"GENERAL LICENSEE REGISTRATION"

Review all six sections of this registration form. If any information is incorrect or missing, make corrections in 

the applicable boxes. If you have more devices than space provided in the form, copy the form before 

starting, as needed. Use black ink and print in CAPITAL LETTERS. Start information in the first box 

provided. If the information contains a number with a dash (-) or a decimal point (.), include the dash or 

decimal point as an individual character. Use the "ø" character to represent the number 0 (zero).

Verify information about the devices by reviewing the label on the outside of the device. For safety reasons, 

DO NOT TRY TO TAKE APART any device to verify this information. If you are uncertain how to identify 

the device's label, contact the device's manufacturer or an authorized service agent for this information. Also, 

contact the manufacturer for any additional information about NRC requirements. You may also review 10 

CFR 31.5 and other applicable regulations on the NRC web site at 

http://www.nrc.gov/reading-rm/doc-collections/cfr/, or review specific information about the general licensee 

project at http://www.nrc.gov/materials/miau/miau-reg-initiatives/gen-license.html. 

Note to specific licensees: If you believe the device(s) listed on the registration form are possessed under 

your specific license, then verify the device label does not state the device is subject to a general license. If 

the labels indicate the device is subject to a general license, then complete the registration form as instructed 

below. If not, complete the registration as instructed below, however, in Section 2, follow the instructions for 

“not in possession of device” and complete one Section 4 page per device transferred to your specific license.

Section 1 - General Licensee Information. Provide the requested information about you, the general 

licensee. 

On Page 1, provide the street address/location where your device(s) are used. For portable devices, provide 

the storage location. P.O. Box addresses are not allowed.

Do not write in the box marked For NRC Use Only

On Page 2, provide the name, business telephone number, business e-mail address, and title of the individual 

responsible for your device(s), and a mailing address where correspondence about your device(s) can be sent. 

The mailing address should be specific to the physical location where the devices are used and/or stored (P.O. 

boxes may be used if this is the only available mailing address). The individual indicated in this section as 

responsible for your device(s) must also verify and sign the form in Section 5.

Section 2 - Devices Subject to Registration. This section lists each device subject to registration and in 

your possession, according to NRC records. Devices subject to registration include those containing at least 

one of the radionuclides listed in Table 1, with the activity indicated, at the time of manufacture.

Table 1. Criteria for Registration

Radionuclide

Strontium-90, Radium-226 3.7 megabecquerel (0.1 millicurie)

Cobalt-60, Curium-244, Americium-241, Californium-252 37 megabecquerel (1 millicurie)

Activity greater than or equal to:

Cesium-137 370 megabecquerel (10 millicurie)

Use the codes from Table 2 when correcting isotope information for devices in this section. If you do not 

possess a device on this list, blacken the "not in possession of device" circle, and provide the relevant 

information in Section 4. Note that each device is assigned a unique six-digit number called the NRC Device 

Key.

Radionuclide Code for form Radionuclide Code for form

Americium-241 AM241 Curium-244 CM244

Californium-252 CF252 Strontium-90 SR90

Cesium-137 CS137

Cobalt-60 CO60

Table 2. Isotope Codes for Sections 2 and 3

Radium-226 RA226
Section 3 - Additional Devices. If you have other generally licensed devices (not listed in Section 2) that 

meet the conditions for registration listed in Table 1, provide information about each additional device. Before 

starting, copy this section as needed for your additional devices. Also indicate how you acquired each 

device by blackening the proper circle.

When entering isotope and unit information for your device(s), use the codes listed in Table 2 of Section 2 for 

isotope information, and use the codes from Table 3 for unit information:

Section 4 - Not in Possession of Device. Use this section to report any devices that are listed in Sections 2 

or 6, but that you no longer possess. Before starting, copy this section as needed for additional devices 

that are not in your possession. Enter the NRC Device Key, as listed in Section 2 or 6. Blacken the circle 

(choose only one) that best describes the disposition of the device and complete the rest of the section as 

appropriate.

Section 5 - Certification and Signature. The responsible individual must certify, sign, and date Section 5.

Section 6 - Devices Not Subject to Registration. This list contains information about devices that NRC 

records indicate are in your possession, but are not subject to registration. If you no longer have one or 

more of the listed devices, you are required to make a transfer report to NRC in accordance with 10 CFR 31.5

(c)(8) or (9), as applicable. You may use Section 4 for this purpose. This section does not list any static 

eliminators containing polonium-210 (Po-210), or luminous exit signs containing tritium (H-3). These devices 

are not subject to registration, and are not included in this section in an effort to reduce the length of this form.

RETURN THE COMPLETED FORM IN THE ENCLOSED LARGE ENVELOPE WITH PROPER POSTAGE.

Unit Code for form Unit Code for form

picocurie PCI becquerel BQ

nanocurie NCI kilobecquerel KBQ

microcurie UCI megabecquerel MBQ

millicurie MCI gigabecquerel GBQ

Table 3. Unit Codes for Section 3

curie CI terabecquerel TBQ

pound LB microgram UG

milligram MG

kilogram KG gram G
GL - -

Date

NRC FORM 664

(11-29-2022)

10 CFR 31.5

SECTION 1

PAGE 1 of 2

U.S. NUCLEAR REGULATORY COMMISSION

GENERAL LICENSEE REGISTRATION

APPROVED BY OMB: NO. 3150-0198 OMB EXPIRATION DATE: 11/30/2025

Estimated burden per response to comply with this mandatory collection request: 20 minutes. NRC will use this information to track general licensees and their devices to ensure a higher level of device 

accountability. Send comments regarding burden estimate to the FOIA, Library, and Information Collections Branch (T-6 A10M), U. S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by 

email to Infocollects.Resource@nrc.gov, and the OMB reviewer at: OMB Office of Information and Regulatory Affairs, (3150-0198), Attn: Desk Officer for the Nuclear Regulatory Commission, 725 17th Street 

NW, Washington, DC 20503; email: oira_submission@omb.eop.gov. The NRC may not conduct or sponsor, and a person is not required to respond to, a collection of information unless the document 

requesting or requiring the collection displays a currently valid OMB control number.

Complete all six sections of this registration form. If any of the preprinted information is incorrect, provide the 

changes in the applicable boxes. USE CAPITAL LETTERS.

General License SECTION 1 - GENERAL LICENSEE INFORMATION

Registration Number

GL - -

Enter the company name and street address for the physical location of use for the device(s). For portable 

devices, specify the primary storage location. Do not use P. O. Boxes.

Company Name:

Department:

Address Line 1:

Address Line 2:

City: 

State: Zip Code: -

For NRC Use Only

(Do not write here) Category:

Packet Receipt Date (MMDDYYYY)

Accession Number
GL - -

Date

SECTION 1

PAGE 2 of 2

SECTION 1 - GENERAL LICENSEE INFORMATION (Continued)

Enter the name, telephone number, and title of the person who is the responsible individual for the device(s).

Last Name:

First Name: Middle Initial:

Business Telephone Number:

- -

Extension:

Business E-mail Address:

Enter the mailing address where correspondence regarding your device(s) should be sent. This address should be 

specific to the physical location where the devices are used and/or stored.

Department:

Address Line 1:

Address Line 2:

City: 

State: Zip Code: -

Title:
GL - -

Date

SECTION 2

SECTION 2 - DEVICES SUBJECT TO REGISTRATION PAGE 1 OF

Our records indicate that you have these devices. Please update the information as necessary.

NRC Device Key (Internal Control Number)

Distributor/Distributed By:

Distributor License Number:

Manufacturer Name: 

Device Model (Not Source Model):

Device Serial Number: 

Transfer Date:

MM DD YYYY

Not in possession of device (Also complete Section 4)

Isotope (e.g., AM241)

1.

Activity (e.g., 100) Unit (e.g., mCi)

2.

3.

4.

5.

6.
GL - -

Date

SECTION 2 - DEVICES SUBJECT TO REGISTRATION

SECTION 2

PAGE OF

Our records indicate that you have these devices. Please update the information as necessary.

NRC Device Key (Internal Control Number)

Distributor/Distributed By:

Distributor License Number:

Manufacturer Name: 

Device Model (Not Source Model):

Device Serial Number: 

Transfer Date:

MM DD YYYY

Not in possession of device (Also complete Section 4)

Isotope (e.g., AM241)

1.

Activity (e.g., 100) Unit (e.g., mCi)

2.

3.

4.

5.

6.
GL - -

Date

SECTION 3 - ADDITIONAL DEVICES SUBJECT TO REGISTRATION

SECTION 3

PAGE 1 OF

Provide information about other devices you have that are subject to registration. Do not report specifically 

licensed devices.

Manufacturer Name

Initial Transferor Name

Initial Transferor License Number (if known)

Device Model Number (Not Source Model)

Device Serial Number

How acquired and date 

(e.g., from a distributor/ 

manufacturer, other 

licensee, other source)?

Manufacturer/Initial Transferor listed above

Other General License

Other Source

Date Transferred:

MM DD YYYY

Isotope (e.g., AM241)

1.

Activity (e.g., 100) Unit (e.g., mCi)

2.

3.

4.

5.

6.

7.

8.

9.

10.
GL - -

Date SECTION 4 - NOT IN POSSESSION OF DEVICE

SECTION 4

PAGE 1 OF

Provide information about devices listed in Section 2 or 6, but no longer in your possession.

Part 1

NRC Device Key 

(from Section 2 or 6)

Transfer Date

MM DD YYYY

Location of the Device:

Whereabouts Unknown 

(complete Part 1 only)

Never Possessed the Device 

(complete Part 1 only)

Returned to Manufacturer 

(complete Part 1 only)

Transferred to another general licensee 

(complete Parts 2 and 3)

Transferred to a Specific Licensee (not the manufacturer) 

(complete Part 2)

Part 2

License Number of Recipient (if transferred to a specific licensee)

Company Name:

Department:

Address Line 1:

Address Line 2:

City:

State: Zip Code: -

Part 3 Enter the name of the individual responsible for this device.

Last Name:

First Name: Middle Initial:

Business Telephone Number:

- -

Extension

Title
GL - -

Date SECTION 5 - CERTIFICATION

SECTION 5

PAGE 1 of 1

I hereby certify that:

A. All information contained in this registration is true and complete to the best of my knowledge and belief.

B. A physical inventory of the devices subject to registration has been completed and the device information

on this form has been checked against the device labeling.

C. I am aware of the requirements of the general license, provided in 10 CFR 31.5. 

(Copies of applicable regulations may be viewed at the NRC Web site at www.nrc.gov/reading-rm/doc-collections/cfr/)

SIGNATURE - RESPONSIBLE INDIVIDUAL (Listed in Section 1) DATE

WARNING: FALSE STATEMENTS MAY BE SUBJECT TO CIVIL AND/OR CRIMINAL PENALTIES. NRC 

REGULATIONS REQUIRE THAT SUBMISSIONS TO THE NRC BE COMPLETE AND ACCURATE IN ALL 

MATERIAL ASPECTS. 18 U.S.C. SECTION 1001 MAKES IT A CRIMINAL OFFENSE TO MAKE A 

WILLFULLY WRONG STATEMENT OR REPRESENTATION TO ANY DEPARTMENT OR AGENCY OF THE 

UNITED STATES AS TO ANY MATTER IN ITS JURISDICTION.
GL - -

Date SECTION 6 - DEVICES NOT SUBJECT TO REGISTRATION

SECTION 6

PAGE 1 OF

NRC Device Key: Manufacturer License No.:

Manufacturer Name:

Model Number: Serial No.: Transfer Date:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

NRC Device Key: Manufacturer License No.:

Manufacturer Name:

Model Number: Serial No.: Transfer Date:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

NRC Device Key: Manufacturer License No.:

Manufacturer Name:

Model Number: Serial No.: Transfer Date:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:
GL - -

Date

SECTION 6 - DEVICES NOT SUBJECT TO REGISTRATION

SECTION 6

PAGE OF

NRC Device Key: Manufacturer License No.:

Manufacturer Name:

Model Number: Serial No.: Transfer Date:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

NRC Device Key: Manufacturer License No.:

Manufacturer Name:

Model Number: Serial No.: Transfer Date:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

NRC Device Key: Manufacturer License No.:

Manufacturer Name:

Model Number: Serial No.: Transfer Date:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit:

Isotope: Activity: Unit: