Page 1 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Active Radiation Monitoring on the International Space Station 02ICES-110 Tad Shelfer*, Eddie Semones, Steve Johnson, Neal Zapp, Mark Weyland, Fadi Riman and Joel Flanders Lockheed-Martin Mike Golightly and Gwyn Smith NASA - JSC Space Radiation Analysis Group NASA Johnson Space Center Houston, TX 77058, USA * Sustaining Engineer, tad.shelfer1@jsc.nasa.gov Image of ISS Page 2 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Introduction • ISS Expedition Information • ISS Tissue Equivalent Proportional Counter (ISS TEPC) • Brief description of the instrument • Presentation of Expedition 1 and 2 data • Intra-Vehicular Charged Particle Directional Spectrometer (IV-CPDS) • Brief description of the instrument • Presentation of Expedition 2 data • Summary and Conclusions Page 3 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball International Space Station Increment Information • Expedition 1 • Bill Shepherd, Sergei Krikalev, and Yuri Gidzenko • Start: ISS 2R, October 31, 2000 • End: STS-102, March 21, 2001 • Expedition 2 •Yury Usachev, James Voss, and Susan Helms • Start: ISS 5A.1, March 8, 2001 • End: STS-105, August 22, 2001 Patches from Expedition 1 and Expediton 2 Page 4 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of ISS TEPC, power/data cable, seat track connector, detector cable, , detector seat track connector, detector, spectometer, RS-232 Cable Page 5 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of the ISS TEPC Spectormeter. Dual Mulit-Channel Analyzer Design. 1024 Channels of Low-Gain Data. 256 Channels of High-Gain Data. RS-232 and 1553 Communication Ports. 120 V or 28 V Power operation Page 6 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of Proportional Counter Detector. Fill Gas: 2 Torr Propane. Dual Chamber Design. Main Detector Chamber. Small Diagnostic Chamber. Represents a 2 micrometer diameter volume of human tissue Page 7 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball ISS TEPC Relocate History Expedition 1 Date Location 11/09/00 SM Panel 110 11/18/00 SM Panel 338 12/01/00 SM Panel 428 12/19/00 SM Panel 327 01/09/01 SM Panel 110 01/26/01 SM Panel 338 02/05/01 SM Starboard CQ 02/28/01 US Lab O3/O4 03/13/01 SM Panel 334 04/04/01 US Lab S1/O1 Expedition 2 Date Location 05/10/01 US Lab S1/O1 (1) 05/18/01 US Lab S1/O1 (2) 05/25/01 US Lab S1/O1 06/01/01 US Lab S6 06/12/01 SM Panel 338 06/26/01 SM Panel 327 08/07/01 SM Starboard CQ (1) PRP Brick +Velocity (2) PRP Brick Zenith Page 8 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of Astronaut on ISS. ISS01E6171 2001/01/31 Page 9 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of 2 astronauts on ISS. Page 10 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of Astronaut on ISS. ISS02E9563 2001/05/14 Page 11 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of ISS TEPC on ISS. ISS02E6034 2001/05/16 Page 12 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of ISS TEPC on ISS. ISS02E6298 2001/05/20 Page 13 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of ISS TEPC on ISS. ISS02E8412 2001/06/26 Page 14 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of ISS TEPC 24-Hour Web Displays. Current Current GMT 105/00:00:00. Instrument Mode No Signal. Alarm Status (Set Point: 5mrad/min) Nominal Serial Number 1003. Location Service module. Position Panel 336 GMT (Last Update) 105/20:38:25. Dose Rate (mrad/min) 0.0. Dose Eq. Rate (mrem/min) 0.0 Cumulative Total (since Instrument Turned On) 013/02:37:00 Dose (mrad) 87.9. Dose Eq. (mrem) 387.0 Yesterday 104. Dose (mrad) 12.4. Dose Eq. (mrem) 54 Today 105. Dose (mrad) 573.9. Dose Eq. (mrem) 2186 Last 24 Hours 104-105 00:00:00. Dose (mrad) 12.4. Dose Eq. (mrem) 54 Instrument Status Power Error. 1553 Error. CPU Error. MCA Error File Status First File 0. Last File 0. Current File 0 Real Time Monitor Code 0. Description Nominal Page 15 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball ISS TEPC Daily Dose Display Start Date 12/15/2001 GMT 22:19:00 End Date 05/15/2002 GMT 23:59:59 Note: ISS 4 start date & time was 12/15/2001 22:19:00. Daily Dose Summary Daily Dose (mrad) 0 - 80 Date 339 - 134 Accum. Daily Dose (mrad) 0 - 2458.40 Daily Dose Equivalent Summary Daily Dose Equiv. (mrem) 0 - 330 Date 339 - 134 Accum. Daily Dose Equiv. (mrem) 0 - 9684 Page 16 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Expedition 1 & 2 As Flown Altitude Plot Altitude 320.0 - 390.0 From: 10/27/99 - 08/22/00 Page 17 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Expedition 1 Total Dose and Altitude Total Dose (MicroGy/day) - 0 - 500 Invariant Altitude 355.0 - 385.0 From: 10/21/2000 - 3/30/2001 Locations: SM-110 SM-338 SM-428 SM-327 SM-110 SM-338 SM-STBD-CQ US LAB O3/O4 Page 18 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Expedition 1 Total Dose and Proton Flux Total Dose (MicroGy/day) - 0 - 500 GOES 8 Proton Flux (protons/cm2-day-sr) 1.00E+03 - 1.00E+05 From: 10/21/2000 - 3/30/2001 Locations: SM-110 SM-338 SM-428 SM-327 SM-110 SM-338 SM-STBD-CQ US LAB O3/O4 Page 19 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Expedition 2 Total Dose and Altitude Total Dose (MicroGy/day) - 0 - 900 Invariant Altitude 370.0 - 400.0 From: 02/28/2001 - 08/27/2001 Locations: SM-334 US Lab S1/O1 +V +Z S1/01 US Lab S6 SM-338 SM-327 Page 20 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Expedition 2 Total Dose and Altitude Expedition 2 Total Dose and Altitude Total Dose (MicroGy/day) - 0 - 900 GOES 8 Proton Flux (protons/cm2-day-sr) 1.00E+03 - 1.00E+06 From: 02/28/2001 - 08/27/2001 Locations: SM-334 US Lab S1/O1 +V +Z US Lab S1/01 US Lab S6 SM-338 SM-327 Page 21 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball TEPC Total Dose Graph - Nov 9, 2000 SPE Total Dose (microGy/min) - 0 - 1000000 Elapsed Time (minutes) 0 - 600 SPE, SAA, GCR indicated Page 22 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball TEPC Total Dose Graph - Trapped vs GCR Separation Total Dose (microGy/min) - 0 - 1000000 Elapsed Time (minutes) 1000 - 1600 Threshold Setting indicated Page 23 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Altitude Dependence of Measured Dose Rates Location Start Date End Date Average Total Dose Total Dose Total Q GRC GCR Dose GCR Q Trapped Trapped Trapped Q Altitude Rate Eq Rate Factor Dose Rate Eq Rate Factor Dose Rate Dose Eq Rate Factor (km) (uGy/day) (uSv/day) ICRP60 (uGy/day) (uSv/day) ICRP60 (uGy/day) (uSv/day) ICRP60 SM-110 1/9/2001 1/26/2001 362 300 626 2.1 142 423 3.0 158 203 1.3 SM-110 11/11/2000 11/17/2000 381 252 578 2.3 100 353 3.5 152 226 1.5 SM-338 1/27/2001 2/24/2001 359 208 516 2.5 144 422 2.9 64 94 1.5 SM-338 11/18/2000 11/20/2000 379 221 541 2.5 101 361 3.6 121 180 1.5 SM-STBD-CQ 2/5/2001 2/13/2001 359 233 541 2.3 143 420 2.9 90 121 1.4 SM-STBD-CQ 2/14/2001 2/17/2001 375 281 598 2.1 142 418 2.9 139 180 1.3 SM-STBD-CQ 2/18/2001 2/27/2001 381 290 617 2.1 145 427 3.0 145 190 1.3 SM-327 12/19/2000 1/8/2001 369 185 493 2.7 109 379 3.5 76 115 1.5 SM-327 6/26/2001 7/18/2001 377 236 565 2.4 141 435 3.1 95 130 1.4 SM-327 7/19/2001 7/24/2001 389 295 636 2.2 140 431 3.1 154 205 1.3 SM-327 7/25/2001 8/6/2001 394 310 666 2.2 150 453 3 159 212 1.3 Page 24 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Location Dependence of Measured Dose Rates Location Start Date End Date Average Total Dose Total Dose Total Q GRC GCR Dose GCR Q Trapped Trapped Trapped Q Altitude Rate Eq Rate Factor Dose Rate Eq Rate Factor Dose Rate Dose Eq Rate Factor (km) (uGy/day) (uSv/day) ICRP60 (uGy/day) (uSv/day) ICRP60 (uGy/day) (uSv/day) ICRP60 SM-338 1/27/2001 2/24/2001 359 208 516 2.5 144 422 2.9 64 94 1.5 SM-STBD-CQ 2/5/2001 2/13/2001 359 233 541 2.3 143 420 2.9 90 121 1.4 SM-110 1/9/2001 1/26/2001 362 300 626 2.1 142 423 3.0 158 203 1.3 SM-428 12/1/2000 12/18/2000 374 214 530 2.5 96 354 3.7 119 176 1.5 SM-STBD-CQ 2/14/2001 2/17/2001 375 281 598 2.1 142 418 2.9 139 180 1.3 SM-327 6/26/2001 7/18/2001 377 236 565 2.4 141 435 3.1 95 130 1.4 US LAB O3/O4 2/28/2001 3/12/2001 377 285 613 2.2 126 414 3.3 159 199 1.3 SM-338 11/18/2000 11/20/2000 379 221 541 2.5 101 361 3.6 121 180 1.5 SM-334 3/13/2001 3/16/2001 380 264 617 2.3 149 465 3.1 115 151 1.3 SM-STBD-CQ 2/18/2001 2/27/2001 381 290 617 2.1 145 427 3.0 145 190 1.3 SM-110 11/11/2000 11/17/2000 381 252 578 2.3 100 353 3.5 152 226 1.5 SM-327 7/19/2001 7/24/2001 389 295 636 2.2 140 431 3.1 154 205 1.3 US LAB S1/O1 4/27/2001 5/9/2001 391 345 771 2.2 181 545 3.0 164 226 1.4 SM-PORT-CQ 8/7/2001 8/9/2001 393 324 684 2.1 148 455 3.1 176 229 1.3 SM-327 7/25/2001 8/6/2001 394 310 666 2.2 150 453 3.0 159 212 1.3 Page 25 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of IV-CPDS. Seat Track Mounting Assembly. Power/Data Cable. Spectormeter Page 26 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of 2 astonauts with radiation instrument. ISS002E5246 2001/05/03 Page 27 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Image of radiation instrument. ISS002E6035 2001/05/16 Page 28 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Diagram of CPDS Detector Stack. Detector Types A - 1 mm thick Si. B - 5 mm thick Si/Li. C - Cerenkov. PSD- 24X24 Cells. Stack A1 Detector, PSD1 Detector, PSD2 Detector, A2 Detector, B1/B2 Detectors, B3/B4 Detectors, B5/B6 Detectors, PSD3 Detector, A3 Detector, C Detector Page 29 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball IV-CPDS Count Rate B-1 Detector Graph of Counts from 0 - 20000 verses Elasped Time (min) 0 - 600 Trapped SAA and CGR shown. Page 30 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Scatter Graph of IV-CPDS Delta E A1 Detector (0-800) and Delta E A2 Detector (0 - 600) Page 31 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Summary and Conclusions •Analysis of daily average data complete for first year of operation. •Trapped dose seems to trend with altitude as expected. •Tough to make any conclusions on shielding effects at this time. •Time to tackle minute average data files for more complete picture. •Better method for separating Trapped and GCR dose components needed. •Currently developing software tools to enable detailed analysis of CPDS spectral data. Page 32 SRAG Logo 32nd International Conference on Environment Systems (ICES) 2002 NASA Meatball Gautam Badhwar (1940-2001) Chief Scientist, Space Radiation NASA Johnson Space Center