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7th Workshop on Radiation Monitoring
for the International Space Station
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Preliminary Results of ISS Active Radiation Instruments from 1st ICCHIBAN
(InterComparison for Cosmic-ray with Heavy-Ion Beams At NIRS)
Tad Shelfer *
Eddie Semones
Neal Zapp
Fadi Riman
Joel Flanders
Mark Weyland
Mike Golightly
Space Radiation Analysis Group
NASA - Johnson Space Center
Houston, TX 77058, USA
*
Sustaining Engineer, tad.shelfer1@jsc.nasa.gov
Japanese symbol
Image of Cherry Blossums in Japan
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7th Workshop on Radiation Monitoring for the International Space Station
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Introduction
• Introduction to the ISS Tissue Equivalent Proportional Counter (ISS TEPC)
• Brief description of the exposures measured with the ISS TEPC
• Preliminary results of the ISS TEPC measurements
• Introduction to the Intra-Vehicular Charged Particle Directional
Spectrometer (IV-CPDS)
• Brief description of the exposures measured with the IV-CPDS
• Preliminary results of the IV-CPDS measurements
• Summary and Conclusions
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7th Workshop on Radiation Monitoring for the International Space Station
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Neal on street in Japan
First time in Japan…”go find cold soba!”
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After first Earthquake…”Maybe these helmets are a good idea after all!”
Image of Neal with hardhat
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7th Workshop on Radiation Monitoring for the International Space Station
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Grand Champion - Guest House
Marked up image
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7th Workshop on Radiation Monitoring for the International Space Station
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Image of ISS TEPC with labels: power/data cable, seat track connector, detector cable, detector seat track connector, detector, spectometer, RS-232 Cable
ISS TEPC
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7th Workshop on Radiation Monitoring for the International Space Station
Image of ISS TEPC Spectrometer with labels:
Dual Multi-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
NASA Meatball
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7th Workshop on Radiation Monitoring for the International Space Station
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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
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7th Workshop on Radiation Monitoring for the International Space Station
Image of proportional counter
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7th Workshop on Radiation Monitoring for the International Space Station
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ISS TEPC Exposure Summary
398 MeV Carbon Beam graph (Run7032-25-20-15-10-50510152025-25-20-15-10-50510152025X (mm))
Run7032Front
398 MeV Carbon Beam
Run 7032 – 0 Degrees Centered (30 minutes)
Run 7033 – 30 Degrees Centered (30 minutes)
Run 7034 – 90 Degrees Centered (20 minutes)
Run 7035 – 0 Degrees X+15 Z+15 (20 minutes)
388 MeV Iron Beam graph (Run 7224-25-20-15-10-50510152025-25-20-15-10-50510152025X (mm))
Run 7224Front
388 MeV Iron Beam
Run 7224 – 0 Degrees Centered (30 minutes)
Run 7225 – 30 Degrees Centered (20 minutes)
Run 7226 – 90 Degrees Centered (15 minutes)
Run 7227 - 0 Degrees X+15 Z+15 (20 minutes)
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ISS TEPC 400 MeV Carbon 0 Degrees graph
Graph Labels N(y) 0 - 25000 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Carbon 0 Degrees graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*f(y) 0 - 1.8 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Carbon 0 Degrees graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*f(y) 0 - 1.8 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Carbon 30 Degrees graph
Graph Labels N(y) 0 - 20000 and y (keV/µm) 0.1 - 10000
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7th Workshop on Radiation Monitoring for the International Space Station
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ISS TEPC 400 MeV Carbon 30 Degrees graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*f(y) 0 - 1.8 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Carbon 30 Degrees
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*d(y) 0 - 1.8 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Carbon 90 Degrees graph
Graph Labels N(y) 0 - 14000 and y (keV/µm) 0.1 - 10000
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7th Workshop on Radiation Monitoring for the International Space Station
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ISS TEPC 400 MeV Carbon 90 Degrees graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*f(y) 0 - 1.8 and y (keV/µm) 0.1 - 10000
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7th Workshop on Radiation Monitoring for the International Space Station
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ISS TEPC 400 MeV Carbon 90 Degrees graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*d(y) 0 - 1.8 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Carbon + 15x + 15z graph
Graph Labels N(y) 0 - 9000 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Carbon +15X + 15Z graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*f(y) 0 - 1.2 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Carbon +15x + 15z graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*d(y) 0 - 1.4 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Iron 0 Degrees graph
Graph Labels N(y) 0 - 3000 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Iron 0 Degrees graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*f(y) 0 - 4.5 and y (keV/µm) 0.1 - 10000
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7th Workshop on Radiation Monitoring for the International Space Station
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ISS TEPC 400 MeV Iron 0 Degrees graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*d(y) 0 - 4.5 and y (keV/µm) 0.1 - 10000
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7th Workshop on Radiation Monitoring for the International Space Station
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ISS TEPC 400 MeV Iron 30 degrees graph
Graph Labels N(y) 0 - 1600 and y (keV/µm) 0.1 - 10000
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ISS TEPC MeV Iron 30 Degrees graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*f(y) 0 - 5 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeVIron 30 Degrees graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*d(y) 0 - 6 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Iron 90 Degrees graph
Graph Labels N(y) 0 - 2500 and y (keV/µm) 0.1 - 10000
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7th Workshop on Radiation Monitoring for the International Space Station
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ISS TEPC 400 MeV Iron 90 Degrees graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*f(y) 0 - 4 and y (keV/µm) 0.1 - 10000
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7th Workshop on Radiation Monitoring for the International Space Station
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ISS TEPC 400 MeV Iron 90 Degrees graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*d(y) 0 - 6 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Iron +15x +15z graph
Graph Labels N(y) 0 - 900 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Iron +15x +15z graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*f(y) 0 - 2.5 and y (keV/µm) 0.1 - 10000
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ISS TEPC 400 MeV Iron +15x + 15z graph
The area under this curve delimited by any two values of y is proportional to the fraction of events in that range of lineal energy.
Graph Labels y*d(y) 0 - 3 and y (keV/µm) 0.1 - 10000
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ISS TEPC 1stICCHIBAN Summary
1st ICCHIBAN Run Total Events Mean y Mean y Mean Q Absorbed Dose Absorbed Dose Absorbed Dose Per
Recorded Frequency Dose (Gy) Equivalent (Sy) Event (nGy/Event)
ISS TEPC 0 Degree 400 MeV Carbon 172340 11.76 13.49 2.82 1.20E-04 3.37E-04 2.96
ISS TEPC 30 Degree 400 MeV Carbon 178683 11.47 14.19 3.57 1.37E-04 4.48E-04 2.45
ISS TEPC 90 Degree 400 MeV Carbon 119718 11.81 14.72 4.67 1.04E-04 4.86E-04 2.20
ISS TEPC +15x +15z 400 MeV Carbon 99839 11.01 15.31 3.05 6.48E-05 1.97E-04 2.79
ISS TEPC 0 Degree 400 MeV Iron 168646 222.53 235.63 18.34 2.23E-03 4.10E-02 64.29
ISS TEPC 30 Degree 400 MeV Iron 104182 227.25 240.85 16.94 1.60E-03 2.71E-02 55.97
ISS TEPC 90 Degree 400 MeV Iron 71666 265.91 322.89 14.24 1.44E-03 2.06E-02 57.81
ISS TEPC +15x +15z 400 MeV Iron 102918 217.55 250.80 19.11 1.33E-03 2.55E-02 62.88
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image of IV-CPDS radiation instrument
Labels on image: Seat Track Mounting Assembly. Power/Data Cable. Spectrometer
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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
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IV-CPDS Exposure Summary
398 MeV Carbon Beam graph
Run7032-25-20-15-10-50510152025-25-20-15-10-50510152025X (mm) Run 7032 Front
398 MeV Carbon Beam
Run 7036 – 0 Degrees Centered (40 minutes)
Run 7037 – 30 Degrees Centered (40 minutes)
388 MeV Iron Beam graph
Run 7224-25-20-15-10-50510152025-25-20-15-10-50510152025X (mm) Run7224 Front
388 MeV Iron Beam
Run 7232 – 0 Degrees Centered (10 minutes)
Run 7233 – CH2 Fragmentation (30 minutes)
IV-CPDS X-25mm
CH2 Block 50cm upstream of IV-CPDS
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Image of Radiation Instrument
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IV-CPDS 400 MeV Carbon 0 Degrees graph
Graph Labels N(L) 0 - 25 and L (keV/µm) 0.01 - 100.00
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IV-CPDS 400 MeV Carbon 0 Degrees (corrected) graph
Graph Labels N(L) 0 - 25 and L (keV/µm) 0.01 - 100.00
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design of CPDS - drawing
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IV-CPDS 400 MeV Carbon 30 Degrees graph
Graph Labels N(L) 0 - 14 and L (keV/µm) 0.01 - 100.00
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IV-CPDS 400 MeV Iron 0 Degrees graph
Graph Labels N(L) 0 - 90 and L (keV/µm) 0.01 - 100.00
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IV-CPDS 400 MeV Iron Fragmentation graph
Graph Labels N(L) 0 - 60 and L (keV/µm) 0.01 - 100.00
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IV-CPDS 1st ICCHIBAN Summary
1st ICCHIBAN Run Total Events Absorbed Absorbed Dose Per
Recorded Dose (Gy) Event (nGy/Event)
IV-CPDS 0 Degree 400 MeV Carbon 1856 4.03E-06 2.17
IV-CPDS 30 Degree 400 MeV Carbon 1702 3.03E-06 1.78
IV-CPDS 0 Degree 400 MeV Iron 560 3.49E-06 6.23
IV-CPDS 400 MeV Iron Fragment 1356 4.80E-06 3.54
Note: IV-CPDS LET Max = ~38 keV/µm
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Summary and Conclusions
ISS TEPC:
• Investigate anomalous reset problem
• Lower detector threshold
IV-CDPS:
• Investigate dead time problem
• Investigate double-peak problem
• Lower detector gain settings
Recommendations for 3rd ICCHIBAN Measurement:
• Larger beam size (Biology room?)
• Proton Beam Run
• Iron Fragment Beam Run
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Acknowledgements
• We gratefully acknowledge NIRS for the use of the HIMAC
facility in support of the ICCHIBAN investigations.