11
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f) The area in the vicinity of the source must be
posted with a radiation warning sign, if the radiation
field is greater than 5 mr/hr at a distance of 12
inches from the surface of the gage. [20.204a and
20.203]
g) Personnel monitoring is required when personnel
are apt to receive a dose in excess of 23 mrem/wk
or when they enter a radiation field greater than
100 mr/hr. [20.202a]
h) Whenever the source is to be discarded, it must
be returned to Ronan Engineering for proper
disposal. Ronan Engineering must be contacted for
detailed shipping instructions. [20.301a]
i) The regional operations office of the NRC must
be notified of any incident, such as a fire or
explosion, which involves the radioactive material
used in the gage. [20.403] (Ronan Engineering
should also be notified.)
j) If personnel monitoring is required [20.202a], a
record of the radiation exposure must be kept on
Form NRC-5 [20.401a and 20.401c] and, if the
employee requests it, written notification must be
given annually or on termination of employment.
[19.13]
k) If a person receives more than 1.25 rem per
calendar quarter, he must be notified in writing of
the exposure and the NRC must be notified.
[20.405]
l) A restricted area is defined in 10 CRF 20.3A(14)
and the permissible exposure to individuals in a
restricted area is given in 10 CFR 20.101. An
unrestricted area is defined in 10 CFR 20.3A (17)
and the permissible level of radiation in an
unrestricted area is given in 10 CFR 20.105(b). Any
area where an individual, if continuously present,
can receive a dose in excess of 2 mrem in any one
hour or where he can receive more than 100 mrem
in any seven consecutive days must be treated as
a restricted area and access thereto be under the
control of the licensee.
m) Employees working in, or frequenting, a
restricted area must be advised of the restricted
area by posting a Form NRC-3 19.11(c). The NRC
regulations state that this form must be posted so
than employees can “observe a copy on the way to
or from their place of employment” in the restricted
area. Thus, Form NRC-3 could be posted at or near
the entry into the restricted area. If personnel do
not work in, or frequent, a restricted area, Form
NRC-3 need not be posted.
11.3 Periodic Leakage Test
Information about the periodic leakage test is
covered in Section 12.
11.4 Radiation Publications
For those who desire further information on
radiation safety and the handling of radioactive
material, the following publications are
recommended:
Radiation Dosimetery
, Hine and Brownell
(Academic Press, Inc., 111 Fifth Avenue, New
York, NY 10003)
The following publications and National Bureau of
Standards handbooks are available from the
Superintendent of Documents, Washington, DC
98025:
Number Title
92
Safe Handling of Radioactive Materials
73 Protection Against Radiation from
Sealed Gamma Sources
11.5 Abandonment and Disposal
Abandonment or disposal is prohibited unless
transferred to persons specifically licensed by the
NRC or an agreement state. This means that the
gage cannot be abandoned, sold for scrap, or
placed in the trash bin. If the gage is no longer
needed, it must be shipped to a person or company
specifically licensed by the NRC or an agreement
state to receive the gage for disposal.
11.6 Prohibition of Operation
Operation is prohibited if there is indication of
failure of or damage to shielding or source
containment. If there is any damage to the gage, or
failure of the source rod mechanism, place the
source rod in the OFF position (if possible) and
telephone the field service manager at Ronan
Engineering (606) 342-8500.
Care must be exercised when uncrating the gage.
If the crate is damaged in such a manner that the
gage might be damaged, Ronan Engineering
should be contacted for advice. If the lock is
missing, broken, or not locked, do not uncrate or
mount the gage in position. Call Ronan Engineering
for advice.
11.7 Mounting and Start-up
Anyone may mount the gages in position on the
vessel or pipes, do the electrical wiring, and turn
the electrical power switch ON, if the source holder
is locked in the OFF position.
When mounting the source holder in position, take
the necessary precautions to assure that it is not
dropped or damaged. Refer to the outline drawing
of the source holder in the back of this manual
before mounting it in position.
Only a person specifically licensed by the NRC or
an agreement state is allowed to remove the
source holder from its mounting or to dismantle it.
