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Radiation Test -Raspberry PI Zero-

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Radiation Test for Raspberry PI Zero. We tested Raspberry PI Zero with Cobalt-60. Total Doze is 230 [gray].

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Radiation Test -Raspberry PI Zero-

  1. 1. ©SIProp Project, 2006-2017 1 Radiation Test –Raspberry Pi Zero- Noritsuna Imamura noritsuna@siprop.org
  2. 2. ©SIProp Project, 2006-2017 2 Purpose Testing Total Dose for Raspberry PI Zero Target Devices Raspberry PI Zero: Ver.1.2 MicroSD Card: TOSHIBA 8GB Class10(TOSHIBA MSDAR40N08G)
  3. 3. ©SIProp Project, 2006-2017 3 Regulation Target Radiation Dose ISS(International Space Station) Orbit SSP 30512 Revision C from NASA Heat Sink: 0.5[mm] Thickness of Aluminum Plate 8773[rad/year] = 87.73 [gray/year] Mission Period: 2.6[year] 87.73[gray/year] * 2.6[year] = 228.10 [gray] Testing Radiation Dose Radioactivity: Cobalt-60 Distance of the Radioactivity: 80[cm] Testing Date: 22/Mar/2017 Irradiation Time: 5[h] 46[ray/h] * 5[h] = 230 [gray]
  4. 4. ©SIProp Project, 2006-2017 4 Calculation Tables Table1.SSP 30512 Revision C Table2.Dose Rate
  5. 5. ©SIProp Project, 2006-2017 5 Test Method Phase No. Task Before Test 1 Setup Raspberry PI Zero, Consumption Current Logger, Power Supply. 2 Set Current Date on Raspberry PI Zero. 3 Run the Testing Application on Raspberry PI Zero. During Test 4 Get CPU’s Temperature & Current Time in Every Minute. 5 Create Current Time as File and Write Current Temperature in this File. 6 Get & Save Current Consumption Current by Logger.
  6. 6. ©SIProp Project, 2006-2017 6 Test Application 1/2 Check Targets & Reason CPU Raspberry PI Zero’s parts are a CPU & a voltage regulator only. Clock The clock shifts by a radioactive noise. MicroSD Card MicroSD Card has a micro computer. NAND Flash is weak in radiation.
  7. 7. ©SIProp Project, 2006-2017 7 Test Application 2/2 1. #!/usr/bin/python 2. #coding:utf-8 3. import os 4. import commands 5. import datetime 6. import locale 7. d = datetime.datetime.today() 8. temp = commands.getoutput("vcgencmd measure_temp").split('=') 9. date_form_body=d.strftime("%Y-%m- %d %H:%M:%S ") 10. s=date_form_body + temp[1] + 'n' 11. date_form_file=d.strftime("%Y-%m- %d_%H:%M:%S") 12. filename=date_form_file + '.log' 13. f = open(filename,'a') 14. f.write(s) 15. f.close() Operations 1. Get CPU’s Temperature 2. Get Current Time 3. Create File by Current Time 4. Write CPU’s Temperature & Current Time in this File. 5. Close the File 6. Exit the Application 7. Run this Appli Every Minute by cron
  8. 8. ©SIProp Project, 2006-2017 8 Consumption Current Logger Reason Consumption current goes up by total dose degradation. Operation Get & Save Current Consumption Current Every 30 seconds.
  9. 9. ©SIProp Project, 2006-2017 9 Test Environment Top: Upper-Surface Figure, Lower Left: Front Figure, Lower Right: Rear Figure Red Circle: Raspberry PI Zero Blue Circle: Irradiation Point
  10. 10. ©SIProp Project, 2006-2017 10 During Test The value of radioisotope, and an inside situation
  11. 11. ©SIProp Project, 2006-2017 11 Test Result: CPU Temperature Check Point Check Target Result Success / Failure Are the files made for every minute? MicroSD Card The files were created with the error for 1 second every minute. Success Were the files for 5 hours of test time made? Clock Just files existed. (Last – First) timestamps = 0:02. Success Isn't there any inaccurate temperature data? CPU Almost all the data was 25.0[C]. Occasional the data is 24.5[C]-26.0 [C]. Success By the above-mentioned test result, I judged that Raspberry PI Zero passed this test.
  12. 12. ©SIProp Project, 2006-2017 12 Test Result: Consumption Current 0 20 40 60 80 100 120 経過(分) -37.0 -30.0 -23.0 -16.0 -9.0 -2.0 5.0 12.0 19.0 26.0 33.0 40.0 47.0 54.0 61.0 68.0 75.0 82.0 89.0 96.0 103.0 110.0 117.0 124.0 131.0 138.0 145.0 152.0 159.0 166.0 173.0 180.0 187.0 194.0 201.0 208.0 215.0 222.0 229.0 236.0 243.0 250.0 257.0 264.0 271.0 278.0 285.0 292.0 299.5 306.5 ConsumptionCurrent(mA) Irradiation Time (min, 0=Start Time, 300=End Time) By the above-mentioned test result, I judged that Raspberry PI Zero passed this test. But Consumption Current is increasing after 230min. It will be expected that radiation breaks if it is longer time.
  13. 13. ©SIProp Project, 2006-2017 13 Test Result: Conclusion By these test results, I judged that Raspberry PI Zero had radiation resistivity. It will be expected that radiation breaks if it is longer time.

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