urn:nasa:pds:a15xrfs_surface_xray_counts:data:a15_xrfs_71_normal_mode 1.0 1.20.0.0 Product_Observational 2025-07-23 1.0 Apollo 15 X-Ray Fluorescence Spectrometer Normal Mode Data Table a15_xrfs_71_normal_mode 1971-07-30T02:44:00Z 1971-08-04T18:23:00Z Apollo 15 Mission urn:nasa:pds:context:investigation:mission.apollo_15 data_to_investigation The Apollo 15 Command and Service Module Host urn:nasa:pds:context:instrument_host:spacecraft.a15c is_instrument_host Apollo 15 Command and Service Module X-Ray Fluorescence Spectrometer Instrument urn:nasa:pds:context:instrument:xrfs.a15c is_instrument Moon Satellite urn:nasa:pds:context:target:satellite.earth.moon data_to_target a15_xrfs_71_normal_mode.tab 2006-12-29T21:00:00 Table of raw event counts from the Apollo 15 X-Ray Fluorescence Spectrometer for all channels of the three proportional counters (unfiltered, magnesium filter, aluminum filter) for the lunar surface and all channels of the solar monitor. The spectrometer was set to normal modes (INSTRUMENT_MODE values of 16 or 96) with with all three lunar detectors measuring the same energy ranges. The values give the measurement mode of the instrument, time, orbit, spacecraft position and orientation, and event counts, normally for 8-second intervals, for the three proportional lunar counters and the solar monitor. The normal energy range for the first seven channels of the three lunar-surface counters (detector #1 - unfiltered, detector #2 - magnesium filter, and detector #3 - aluminum filter) was between 0.75 and 2.75 keV broken into seven equal intervals: 0.75-1.04, 1.04-1.32, 1.32-1.61, 1.61-1.89, 1.89-2.18, 2.18-2.46, and 2.46-2.75 keV. The solar monitor (detector #4) measured the range from approximately 1 to 3 keV, divided into seven equal intervals. In all four detectors, an eighth channel recorded all X-ray events with energies higher than the upper level. The solar monitor data in this table were not usable because of saturation effects. TABLE 0 26843 Carriage-Return Line-Feed 45 0 295 instrument_mode 1 1 ASCII_Integer 3 Measurement mode of the X-Ray Spectrometer: 16 : Indicates normal mode, the three lunar surface detectors measuring the external input of energies above 0.75 keV or the solar monitor measuring external inputs above 1.0 keV. 96 : Indicates normal calibration mode, where the Magnesium K alpha and Fe55 calibration sources were rotated into the field of view of lunar surface detectors 1, 2, and 3. 144 : Indicates the same as normal mode 16 except the energy range and all range boundaries for lunar surface detector 1 channels have been doubled. 224 : Indicates the same spectral range as mode 144 but the lunar surface detectors 1, 2, and 3 were measuring K alpha and Fe55 calibration sources. ground_elapsed_time 2 4 ASCII_Real 11 seconds Ground elapsed time in seconds (time since launch of Apollo 15 at 13:34:00 UT on 26 July 1971) of the midpoint of the count accumulation period. lunar_orbit_number 3 15 ASCII_Real 9 Lunar orbit number, to the nearest tenth of an orbit. sc_selenographic_latitude 4 24 ASCII_Real 9 degrees Subspacecraft selenographic latitude in degrees from 90 to -90 at the midpoint of the accumulation period. sc_selenographic_longitude 5 33 ASCII_Real 9 degrees Subspacecraft selenographic longitude in degrees east from 180 to -180 at the midpoint of the accumulation period. sc_altitude 6 42 ASCII_Real 9 kilometers Spacecraft altitude in km assuming mean circular Moon (i.e. no terrain corrections). The equatorial radius of the moon is roughly 1738 km. sc_pitch_angle 7 51 ASCII_Real 9 degrees Spacecraft pitch angle in degrees. sc_yaw_angle 8 60 ASCII_Real 9 degrees Spacecraft yaw angle in degrees. sc_roll_angle 9 69 ASCII_Real 9 degrees Spacecraft roll angle in degrees. detector_1_channel_1_event_count 10 78 ASCII_Integer 6 count Event count for channel 1 (0.75-1.04 keV) of lunar detector 1 (unfiltered). In modes 144 and 224 the energy range is 1.50-2.08 keV. detector_1_channel_2_event_count 11 84 ASCII_Integer 6 count Event count for channel 2 (1.04-1.32 keV) of lunar detector 1 (unfiltered). In modes 144 and 224 the energy range is 2.08-2.64 keV. detector_1_channel_3_event_count 12 90 ASCII_Integer 6 count Event count for channel 3 (1.32-1.61 keV) of lunar detector 1 (unfiltered). In modes 144 and 224 the energy range is 2.64-3.22 keV. detector_1_channel_4_event_count 13 96 ASCII_Integer 6 count Event count for channel 4 (1.61-1.89 keV) of lunar detector 1 (unfiltered). In modes 144 and 224 the energy range is 3.22-3.78keV. detector_1_channel_5_event_count 14 102 ASCII_Integer 6 count Event count for channel 5 (1.89-2.18 keV) of lunar detector 1 (unfiltered). In modes 144 and 224 the energy range is 3.78-4.36 keV. detector_1_channel_6_event_count 15 108 ASCII_Integer 6 count Event count for channel 6 (2.18-2.46 keV) of lunar detector 1 (unfiltered). In modes 144 and 224 the energy range is 4.36-4.92 keV. detector_1_channel_7_event_count 16 114 ASCII_Integer 6 count Event count for channel 7 (2.46-2.75 keV) of lunar detector 1 (unfiltered). In modes 144 and 224 the energy range is 4.92-5.50 keV. detector_1_channel_8_event_count 17 120 ASCII_Integer 6 count Event count for channel 8 (above 2.75 keV) of lunar detector 1 (unfiltered). In modes 144 and 224 the energy range is above 5.50 keV. detector_1_non_xray_event_count 18 126 ASCII_Integer 6 count Event count of all non X-ray events for lunar detector 1 (unfiltered) detector_2_channel_1_event_count 19 132 ASCII_Integer 6 count Event count for channel 1 (0.75-1.04 keV) of lunar detector 2 (magnesium filter). detector_2_channel_2_event_count 20 138 ASCII_Integer 6 count Event count for channel 2 (1.04-1.32 keV) of lunar detector 2 (magnesium filter). detector_2_channel_3_event_count 21 144 ASCII_Integer 6 count Event count for channel 3 (1.32-1.61 keV) of lunar detector 2 (magnesium filter). detector_2_channel_4_event_count 22 150 ASCII_Integer 6 count Event count for channel 4 (1.61-1.89 keV) of lunar detector 2 (magnesium filter). detector_2_channel_5_event_count 23 156 ASCII_Integer 6 count Event count for channel 5 (1.89-2.18 keV) of lunar detector 2 (magnesium filter). detector_2_channel_6_event_count 24 162 ASCII_Integer 6 count Event count for channel 6 (1.89-2.18 keV) of lunar detector 2 (magnesium filter). detector_2_channel_7_event_count 25 168 ASCII_Integer 6 count Event count for channel 7 (2.46-2.75 keV) of lunar detector 2 (magnesium filter). detector_2_channel_8_event_count 26 174 ASCII_Integer 6 count Event count for channel 8 (above 2.75 keV) of lunar detector 2 (magnesium filter). detector_2_non_xray_event_count 27 180 ASCII_Integer 6 count Event count of all non X-ray events for lunar detector 2 (magnesium filter). detector_3_channel_1_event_count 28 186 ASCII_Integer 6 count Event count for channel 1 (0.75-1.04 keV) of lunar detector 3 (aluminum filter). detector_3_channel_2_event_count 29 192 ASCII_Integer 6 count Event count for channel 2 (1.04-1.32 keV) of lunar detector 3 (aluminum filter). detector_3_channel_3_event_count 30 198 ASCII_Integer 6 count Event count for channel 3 (1.32-1.61 keV) of lunar detector 3 (aluminum filter). detector_3_channel_4_event_count 31 204 ASCII_Integer 6 count Event count for channel 4 (1.61-1.89 keV) of lunar detector 3 (aluminum filter). detector_3_channel_5_event_count 32 210 ASCII_Integer 6 count Event count for channel 5 (1.89-2.18 keV) of lunar detector 3 (aluminum filter). detector_3_channel_6_event_count 33 216 ASCII_Integer 6 count Event count for channel 6 (2.18-2.46 keV) of lunar detector 3 (aluminum filter). detector_3_channel_7_event_count 34 222 ASCII_Integer 6 count Event count for channel 7 (2.46-2.75 keV) of lunar detector 3 (aluminum filter). detector_3_channel_8_event_count 35 228 ASCII_Integer 6 count Event count for channel 8 (above 2.75 keV) of lunar detector 3 (aluminum filter). detector_3_non_xray_event_count 36 234 ASCII_Integer 6 count Event count of all non X-ray events for lunar detector 3 (aluminum filter). detector_4_channel_1_event_count 37 240 ASCII_Integer 6 count Event count for channel 1 (1.00-1.29 keV) of the solar monitor. detector_4_channel_2_event_count 38 246 ASCII_Integer 6 count Event count for channel 2 (1.29-1.57 keV) of the solar monitor. detector_4_channel_3_event_count 39 252 ASCII_Integer 6 count Event count for channel 3 (1.57-1.86 keV) of the solar monitor. detector_4_channel_4_event_count 40 258 ASCII_Integer 6 count Event count for channel 4 (1.86-2.14 keV) of the solar monitor. detector_4_channel_5_event_count 41 264 ASCII_Integer 6 count Event count for channel 5 (2.14-2.43 keV) of the solar monitor. detector_4_channel_6_event_count 42 270 ASCII_Integer 6 count Event count for channel 6 (2.43-2.71 keV) of the solar monitor. detector_4_channel_7_event_count 43 276 ASCII_Integer 6 count Event count for channel 7 (2.71-3.00 keV) of the solar monitor. detector_4_channel_8_event_count 44 282 ASCII_Integer 6 count Event count for channel 8 (above 3.00 keV) of the solar monitor. detector_4_non_xray_event_count 45 288 ASCII_Integer 6 count Event count of all non X-ray events for the solar monitor.