urn:nasa:pds:vl_labeled_release:data_raw:vl2c2rc 1.0 1.21.0.0 Product_Observational 2024-04-24 1.0 Initial version. 1976-10-03T07:43:35Z 1976-10-23T07:07:35Z Viking Mission urn:nasa:pds:context:investigation:mission.viking data_to_investigation Viking Lander 2 Host urn:nasa:pds:context:instrument_host:spacecraft.vl2 is_instrument_host LABELED RELEASE for VL2 Instrument urn:nasa:pds:context:instrument:lr2.vl2 is_instrument Mars Planet urn:nasa:pds:context:target:planet.mars data_to_target radioactivity_counts Primary_Mission 28 48 Viking Lander 2 Cycle 2 Sample vl2c2rc.tab 2001-07-05 0 1879 Radioactivity measurements made during Viking Lander 2 cycle 2. This cycle included two nutrient injections, which occurred at: Injection MMT Local Lander Time UTC 1 3043010 34/06:50:52 1976-10-08T18:05:35 2 3394310 38/05:47:31 1976-10-12T19:40:35 Carriage-Return Line-Feed 12 0 119 raw_counts 1 1 ASCII_Real 10 counts/minute Raw radioactivity counts measured by the Labeled Release beta detectors. Data are given in counts/minute. background_corrected_counts 2 12 ASCII_Real 10 counts/minute Radioactivity counts with a background value subtracted. The background value was determined by averaging measurements acquired prior to the first injection of this analysis cycle. A constant background value was used for the entire cycle. channel_number 3 23 ASCII_Integer 3 Code used to designate which beta particle detector (channel) was used for a given measurement. Radioactivity could be counted using one or both detectors. Channel numbers 10 and 20 refer to the right and left detectors, respectively. Channel number 0 means that both detectors was used. Radioactivity values are approximately twice as large when both detectors were used. mars_mission_time 4 27 ASCII_Integer 9 seconds Mars mission time (MMT) is the number of seconds past midnight of Sol 0 (day of landing). Mars mission time is the primary time system used by the Labeled Release experiment. Additional time fields in this data set are derived from the Mars mission time. native_time 5 38 ASCII_String 12 Native time is the local lander time given as a sol number followed by hours, minutes, and seconds past local midnight on that sol. A sol is a martian solar day with Sol 0 as day of landing. Native time is computed from Mars mission time assuming that a sol is 88775.241 seconds. observation_time 6 52 ASCII_Date_Time_YMD 19 The UTC date and time of a given measurement. Observation time was computed from Mars mission time. hours_from_first_injection 7 72 ASCII_Real 9 hours This field gives the measurement time as hours since the first nutrient injection. Values are expressed as decimal numbers. Negative values indicate times before the nutrient injection. This field is computed from Mars mission time. hours_from_second_injection 8 82 ASCII_Real 9 hours This field gives the measurement time as hours since the second nutrient injection. Values are expressed as decimal numbers. Negative values indicate times before the nutrient injection. This field is computed from Mars mission time. sols_from_sol_34 9 92 ASCII_Real 8 This field gives measurement time in terms of the number of sols since the start of Sol 34 (i.e., near the start of the measurement sequence). Values are expressed as decimal numbers. This field is computed from Mars mission time assuming the length of a sol is 88775.241 seconds. counting_interval 10 101 ASCII_Integer 6 seconds The time interval used for counting radioactivity. LR radioactivity data are generally counted for periods of 960 seconds (16 minutes). The counting interval was as short as 120 seconds near the time of nutrient injection. Values are given in seconds. delta_mmt 11 108 ASCII_Integer 6 seconds The number of seconds between the current measurement and the previous one. This field is computed as the difference in Mars mission time between the current and previous measurements. Values greater than 960 seconds may indicate a data gap. observation_note 12 116 ASCII_String 1 This field is used to note possible anomalous radioactivity values. This field contains an 'A' if the radioactivity value is more than four standard deviations from the mean value of the surrounding 100 measurements. A value of 'M' in this field means that the channel mode switched between single or dual detector counting mode. In general the mode did not switch on a measurement time boundary, such that the value reported during the switch may be anomalous. vl2c2rc.lbl 0 PDS3 Original PDS3 label. Carriage-Return Line-Feed