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The Natural Gamma Ray Logger (NGRL) measures the ammount amount of natural gamma radiation within whole-round core sections. See 'NGRL User Guide' and 'Technical Note 26: Physical Properties handbook' for additional detaildetails.

Procedures

• Preparing the Instrument

1. Double-click the MUT icon on the desktop (Figure 1a) and login using ship credentials. For more information on data uploading see the "Uploading Data to LIMS" section below.
2. Double-click the IMS icon (Figure 1b). IMS initializes the instrument and checks the movement of the track. Once initialized, the logger is ready to measure the first section.

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1. Wipe off excess moisture and/or mud from the core lineliner.
2. Tape any drill holes, when applicable.

Note: All core sections entering the NGR must be completely dry. Any moisture or liquids liquid present will DAMAGE the instrument.

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3. Place the cursor in the SCAN field and scan the section label. SAMPLE ID and LIMS ID automatically fills. These This ID tags contain tag contains information on expedition, site, hole, core, section number and length.

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6. The boat moves to the first measurement position, and begins measurements. Once finished, if selected, the boat moves to the second position, and begins measurements. The typical measurement rate is 300 seconds each per position. Real time graphs are displayed during acquisition (Figure 4). The graphs display the counts for each detector at each position, also the full spectra for each detector.

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7. Once the measurement is complete, the boat returns to the original load position.

8. All instrument data are stored in C:\DATA\IN.

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