[Code of Federal Regulations]
[Title 10, Volume 1]
[Revised as of January 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 10CFR39.2]

[Page 626-627]
 
                            TITLE 10--ENERGY
 
                CHAPTER I--NUCLEAR REGULATORY COMMISSION
 
PART 39--LICENSES AND RADIATION SAFETY REQUIREMENTS FOR WELL LOGGING
--Table of Contents
 
                      Subpart A--General Provisions
 
Sec. 39.2  Definitions.

    Energy compensation source (ECS) means a small sealed source, with 
an activity not exceeding 3.7 MBq [100 microcuries], used within a 
logging tool, or other tool components, to provide a reference standard 
to maintain the tool's calibration when in use.

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    Field station means a facility where licensed material may be stored 
or used and from which equipment is dispatched to temporary jobsites.
    Fresh water aquifer, for the purpose of this part, means a geologic 
formation that is capable of yielding fresh water to a well or spring.
    Injection tool means a device used for controlled subsurface 
injection of radioactive tracer material.
    Irretrievable well logging source means any sealed source containing 
licensed material that is pulled off or not connected to the wireline 
that suspends the source in the well and for which all reasonable effort 
at recovery has been expended.
    Licensed material means byproduct, source, or special nuclear 
material received, processed, used, or transferred under a license 
issued by the Commission under the regulations in this chapter.
    Logging assistant means any individual who, under the personal 
supervision of a logging supervisor, handles sealed sources or tracers 
that are not in logging tools or shipping containers or who performs 
surveys required by Sec. 39.67.
    Logging supervisor means an individual who uses licensed material or 
provides personal supervision in the use of licensed material at a 
temporary jobsite and who is responsible to the licensee for assuring 
compliance with the requirements of the Commission's regulations and the 
conditions of the license.
    Logging tool means a device used subsurface to perform well logging.
    Personal supervision means guidance and instruction by a logging 
supervisor, who is physically present at a temporary jobsite, who is in 
personal contact with logging assistants, and who can give immediate 
assistance.
    Radioactive marker means licensed material used for depth 
determination or direction orientation. For purposes of this part, this 
term includes radioactive collar markers and radioactive iron nails.
    Safety review means a periodic review provided by the licensee for 
its employees on radiation safety aspects of well logging. The review 
may include, as appropriate, the results of internal inspections, new 
procedures or equipment, accidents or errors that have been observed, 
and opportunities for employees to ask safety questions.
    Sealed source means any licensed material that is encased in a 
capsule designed to prevent leakage or escape of the licensed material.
    Source holder means a housing or assembly into which a sealed source 
is placed to facilitate the handling and use of the source in well 
logging.
    Subsurface tracer study means the release of unsealed license 
material or a substance labeled with licensed material in a single well 
for the purpose of tracing the movement or position of the material or 
substance in the well or adjacent formation.
    Surface casing for protecting fresh water aquifers means a pipe or 
tube used as a lining in a well to isolate fresh water aquifers from the 
well.
    Temporary jobsite means a place where licensed materials are present 
for the purpose of performing well logging or subsurface tracer studies.
    Tritium neutron generator target source means a tritium source used 
within a neutron generator tube to produce neutrons for use in well 
logging applications.
    Uranium sinker bar means a weight containing depleted uranium used 
to pull a logging tool toward the bottom of a well.
    Well means a drilled hole in which well logging may be performed. As 
used in this part, ``well'' includes drilled holes for the purpose of 
oil, gas, mineral, groundwater, or geological exploration.
    Well logging means all operations involving the lowering and raising 
of measuring devices or tools which contain licensed material or are 
used to detect licensed materials in wells for the purpose of obtaining 
information about the well or adjacent formations which may be used in 
oil, gas, mineral, groundwater, or geological exploration.

[52 FR 8234, Mar. 17, 1987, as amended at 65 FR 20344, Apr. 17, 2000]

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