Models 375 (Including Series One), 375/1, 375/2 & 375/4 Section 2
Ludlum Measurements, Inc. Page 2-4 May 2017
Operational Check (optional)
The operational check is an important assurance that the radiation detector
and electronics are working correctly.
Note:
Ludlum Measurements suggests that an operational check be
performed on a regular basis. Local procedures may
supersede this suggestion.
For an operational check, it is necessary to use a radiation check source (not
included, but available). When not being used, store the check source in a
secure area.
Note:
LMI check sources present very minimal risks and are
therefore unlicensed (Exempt Quantity Sources reference:
10 CFR 30.71 Schedule B). The radioactive element is sealed
(permanently bonded or fixed inside a capsule) so you need
not wash your hands after handling. Radiation exposure
while handling this source is very minimal with no identified
long or short term risks. Although the amount of radiation
given off by exempt sources is so low that it presents no
significant hazard, they should be handled with care and
respect. Time, distance, and shielding are the best ways to
control exposure.
1. Taking the source in hand, place it so that it is located on or near
the center (same location each time) of the detector. (For
internal detector models, a metal plate on the bottom of the
chassis identifies the location of the internal detector.) Hold it
there for approximately five seconds or until the reading
stabilizes. Take note of the displayed level of radiation.
2. Verify that the reading is within 20% of the last reading
obtained. Remove the source from the detector.
3. If an alarm is activated, ensure that all visual and audible devices
(if applicable) work correctly.
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