Radioactive materials are occasionally brought shipboard by scientists for use in their
research.The primary hazards of
radioactive materials are those of the harmful biological effects brought on by
exposure to ionizing radiation; although, some isotopes are also toxic by
ingestion when found in concentrations greater than normally used
shipboard.Radioactive materials
typically found onboard when properly used and handled present no danger to the
scientist or crew. To ensure this is
the case the scientist and crew must follow prescribed protocols and procedures
including: monitoring, clean-up, and record-keeping.
The use, storage, transportation, labeling, and disposal of
radioactive material brought shipboard is regulated through the Nuclear
Regulatory Commission (NRC) using 10 CFR (Code of Federal Regulations) as the
regulatory basis and 49 CFR (Transportation).(The CFR's are available at no cost on the internet at
http://www.access.gpo.gov/nara/cfr/index.html.)
The activity and quantity of radioactive material used by the
scientist are controlled by license issued to the operating institution for
whom the scientist works and is called the Nuclear Regulatory Commission
Byproduct Material License or equivalent.
The guiding protocols for proper radioactive materials management shipboard are three fold:
- Obtaining Coast Guard approval to handle isotopes shipboard
- Following accepted radiological work practices
- Detailed record-keeping
The first protocol (Coast Guard approval) is
accomplished early on in the planning process for investigative work using
radioisotopes at sea. The Chief
scientist will indicate whether isotopes will be used on the ship in the online
Polar Sea
cruise planning questionaire. The
Coast Guard will notify the scientist of approval to use radioisotopes only
after review of the completed application forms. The institution’s Radioisotope Users Committee (or equivalent)
will review and approve the proposed research and the Radiation Safety Officer
(RSO) will authorize possession and use of the desired radioisotope.
Both approvals are required prior to performing
work involving radioisotopes onboard Coast Guard cutters and shall be presented
with the above forms. Prior to the
scientist reporting shipboard and prior to the Coast Guard accepting any
supplies involved in the investigative work, the cutter (ice breaker) shall
have received the following:
- Completion of the following form USCG Radioisotope
Project Use Request form
The second protocol (work practices) shall be the radiological
work practices enforced at the authorizing institution and approved by the
RSO. The scientist will be responsible
for adapting the work practices established at the authorizing institution to
the shipboard work areas. The scientist
will provide and post all required radiological signs, provide all containments
and/or anti-contamination clothing, do monitoring, clean-up of any spills,
maintain dosimetry/dosimetry records, and perform final clean-up and survey of
the work space for "free release" of the work space.
All laboratory work involving radioactive material shall be
conducted in the science van. Any
in-situ/experimental work outside the van involving radioactive material shall
only be conducted in areas approved by the Marine Science Officer.
Note: the Coast Guard will not provide any
monitoring or survey equipment; the scientist will bring all emitter
appropriate equipment shipboard and remove the equipment at the end of the
voyage.
Coast Guard personnel are not
trained or authorized to handle radioactive material and shall not assist the
scientist in ways that risk isotope radiation exposure.
Once the scientist is shipboard and familiar
with the work area, he/she shall brief the Marine Science Officer (or
designated representative) on the required radiological work practices and how
radioisotopes are involved in his/her work.
Upon arriving shipboard the scientist shall provide the Marine Science
Officer the following:
-
A description of experimental/investigative protocol.
This should include the proposed location of
work where radioisotopes might be used, procedures for storage, manipulation,
isolation, control, containment, clean-up of spills and disposal of the
radioactive material.
The following equipment
is required for out-of-laboratory incubation experiments:
-
In-situ incubation shall utilize polycarbonate jars with
polyethylene caps or equivalent.
- On-deck incubation requires as a minimum for spill recovery
a 55 gallon, 49 CFR approved liquid non-bulk hazardous material container and
three five gallon cubit containers or equivalent equipment as agreed to by the
sponsoring institution’s RSO. The 55
gallon container shall contain sorbant material.
It is required that isotope isolation vans have a
"clean bill of health" from the Miami SWAB Group prior
to emplacement on Polar Sea. Wearing of special footwear in the vans is mandatory.
The vans must, therefore, have an area in which it is possible to change
footwear and clothes (e.g., foul weather gear). This will help isolate isotope
contamination in the van from spreading throughout the ship.
Circumstances may occur in which the above procedures will
place an undue burden upon a scientific party, in that some experiments may not
be feasible within the constraints of the policy, or that, while feasible,
meeting the policy would place an unreasonable logistic burden upon the
program. In such a case a detailed justification will be required outlining a
special protocol indicating a awareness of the potential effects on
contamination outside the working area of the vans and a proposed monitoring
program to detect potential spills. The Isotope Committee in that case may
stipulate conditions associated with a waiver.
Monitoring of potential
radioactive spills is imperative. For this reason the following procedures are
considered to be of prime importance. At the end of each leg of Polar Sea during
which radioisotopes have been used, a SWAB test of the
isotope isolation vans, as well as the deck and laboratory spaces, will be
performed by the Miami SWAB test
laboratory. If for some reason (e.g., remoteness or inaccessibility of the
ship) the SWAB
operation cannot be carried out by the Miami group, the resident marine
technician, in collaboration with the PI, could be requested to carry out the SWAB according
to Miami instructions. Samples can then be forwarded to Miami. In case a SWAB test cannot
be accomplished, it will be imperative to lock the vans to access by anyone
until the tests can be performed. This is particularly a necessity because of
clean-up responsibilities of the parties involved in the radioisotopes usage.
If two subsequent legs will have radioisotope usage with different
investigators, then a SWAB test must
be carried out between these legs. The above test program does not preclude the
requirement of regular swab tests by the isotope users, which should be carried
out at least before the start of isotope work, once a week at a minimum during
the cruise, after a suspected spill, and at the end of the cruise.
Results from previous SWAB tests on Polar Sea are posted online (To see Healy SWAB test results click here).
The third protocol (record-keeping) shall be
at a level of detail to prevent the loss of control of radioactive material and
prevent the inadvertent spread of radioactive contamination.
This shall include documentation of any spills and clean-up actions.
The scientist must review and implement the
record-keeping requirements of Form A11 Radioactive Materials Report found in
the ship’s Welcome Aboard Packet. The
scientist shall provide the Coast Guard with the following prior to departing
from the vessel after completion of the investigative work:
-
Radioisotope inventory documenting disposition of
all quantities of the isotopes used in the investigative work; including a
reconciliation of the quantity brought on board and removed from the ship as
either waste, unused material, or samples.
(See Form A11).
- Documentation of surveys performed in the work
space; as a minimum initial (prior to isotope use) and final (“free release”)
work space surveys shall be performed.
(Attach to Form A11).
Radioactive material considered
waste shall not be discharged at sea but retained in containers for disposition
by the authorizing institution. Drain
disposal is prohibited. It is the
responsibility of the scientist to arrange for the proper shore side disposal
of all forms of any radioisotopes remaining onboard at the completion of the
voyage. |