urn:nasa:pds:context:instrument:ccig.a12a 1.0 1.7.0.0 Product_Context Apollo 12 CCIG Apollo 12 Cold Cathode Ion Gage Apollo 12 CCGE Apollo 12 Cold Cathode Gage Experiment 2018-10-04 1.0 Created by the NASA Space Science Data Coordinated Archive; cloned from urn:nasa:pds:context:instrument:ccig.a15a. urn:nasa:pds:context:instrument_host:spacecraft.a12a::1.0 instrument_to_instrument_host urn:nasa:pds:apollodoc:a12doc:a12a_ccig_overview instrument_to_document Apollo 12 Preliminary Science Report, NASA SP-235, 227 pages, published by NASA, Washington D.C., 1970. reference.APOLLO12A1970 Apollo Scientific Experiments Data Handbook, JSC-09166, NASA TMX-58131, August 1974 (revised April 1976), in Johnson Space Center History Office. reference.NASATMX581311976 Johnson, F.S., D.E. Evans, and J.M Carroll, Cold Cathode Gage (Lunar Atmosphere Detector), Apollo 12 Preliminary Science Report, NASA SP-235, pages 93 to 97, Washington D.C., 1970. Bates, J.R., W.W. Lauderdale, and H. Kernaghan, ALSEP termination report, NASA Reference Publication Series, NASA-RP-1036, 162 pages, published by NASA, Washington, D.C., 1979. reference.BATESETAL1979 Apollo 12 Cold Cathode Ion Gage Experiment Particle Detector not applicable not applicable Apollo 12 Cold Cathode Ion Gage (CCIG) experiment measured the density of neutral particles to determine the amount of gas present at the lunar surface and to help help constrain the source and loss mechanisms of the tenuous lunar atmosphere.