Figure 4-2. Swabbing the Ring

TM 5-6635-386-12&P c. Carefully place the tester on its end or side. (See Fig. 4-2). d. Moisten the cotton swab in the detergent/water solution. e. Swab the ring which is located on the bottom of the tester. Do not swab the source rod or the shutter. (See Fig. 4-2). f. Place the cotton swab on the sheet of plastic wrap. g. Return the tester to its upright position. (See Fig. 4-1). Figure 4-2. Swabbing the Ring h. Loosen the four screws which are located in the corners of the tester’s display panel. Lift the panel out of the tester and support it on the case. (See Fig. 4-3). i. With the same swab that was used in e above, swab the red spot which is located within the tester and next to the internal radiation detector. The spot to be swabbed may not be painted red in some testers. (See Fig. 4-3). j. Wrap just the cotton swab and an inch or two of the stick with plastic wrap. Seal the plastic wrap around the stick with cellophane tape. Figure 4-3. Swabbing the Spot k. Reinstall the display panel in the tester and tighten the four screws. I. The swab shall be tested for radiation in an area where background radiation averages 0.04 mrem/hr or less. (1) Adjust the radiac meter AN-PDR/27 or equivalent to measure 0 to 0.5 mrem/hr. (2) Open the cover end of the radiac meter’s probe. (3) Do not touch the swab to the meter’s probe. Place the swab about 0.25 inch in front of the probe and note the meter reading. WARNING • A tester is contaminated when a reading of 0 I mrem/hr or more (or in the case of Colorado 0.2 mrem/hr or more) is obtained from the swab. Follow the procedures provided in Para 4-31. The swab is also contaminated. • The tester shall immediately be withdrawn from use when the wipe test indicates a reading of 0.1 mrem/hr. (or in the case of Colorado 0.2 mremlhr) or when the laboratory test results reveal the presence of 0.005 or more microcuries. m. Cut off the applicator stick at the tape seal. n. If a swab reading greater than 0.4 mrem/hr 4-9