㟼Ṇ㌶㐨ୖ䛾ၟ⏝ 0.25μm CMOS SRAM 䛾 SEU ᛶ⬟䛾ᩘ್ィ⟬䛸䛾ẚ㍑

ᩥ⊩ྡ Correlation of Prediction to On-Orbit SEU Performance for a Commercial 0.25-μm CMOS SRAM

ฟ඾ IEEE Transaction on Nuclear Science, Vol.54, No.6, pp.2525-2533, Dec.2007.

ⴭ⪅ྡ D. L. Hansen, K. Jobe, J. Whittington, M. Shoga, and D. A. Sunderland.

The Boeing Satellite Development Center, Los Angeles, CA 90009-2919 USA ᑐ㇟ࢹࣂ࢖ࢫ IBM 0.25 μm 2.5 V ࢹࣂ࢖ࢫ, SA12 ࣛ࢖ࣈࣛࣜ

ᐇ㦂タഛ Texas A&M኱Ꮫࢧ࢖ࢡࣟࢺࣟࣥࠊ⾨ᫍୖࡢࢹࣂ࢖ࢫ࡜ ᐃჾ

↷ᑕ⥺✀ཬࡧ

࢚ࢿࣝࢠ࣮ࡢ༊ศ

Ne, Ar, Kr, Xe (25 MeV/᰾Ꮚ) ༢Ⓨ⌧㇟ཪࡣ

✚⟬⥺㔞ຠᯝࡢ༊ศ

༢Ⓨ⌧㇟ࠊ୺࡟SEU

1.7 < LET < 60MeV/(mg/cm²) ᐇ㦂ཪࡣ⌮ㄽࡢ༊ศ ᐇ㦂

(1) ™せ

Boeing Satellite Development Center (SDC)䛾()㟁*⏝㟼Ṇ+,䛻⏝䛔䜙䜜䛶䛔䜛DSP

䛿ၟ⏝ 0.25μm 䛾ó^é䞊䝖 CMOS 䛻䜘䜛 ASIC 䛷䛒䜛䚹䛣䛾ㄽᩥ䛷䛿8㝧䝺䜰Ⓨ0©䛾ᮏ

DSP䛻㛵䛩䜛SEU&ᗘ䜈䛾ᙳ㡪➼䜢䛩䚹

(2) ™ㄽ

SDC䛿2ᶵ䛾aືâ¯䝅䝇G䝮⏝+,䜢ÌAୖû䚸䛭䜜ë䜜2001ᖺ䛸2003ᖺ䛻£㌿䜢䜑䛯䚹 'X䛻3000 Pentium processorь䛾⬟a䜢á䛴DSP䜢¸Ê䛧䛯䚹䛣䛾DSP䛿IBM䛾᭱᪂䛾ၟ

⏝ᢏ⾡2.5V䞉0.25 μm䝥䝻䝉䝇䛸SA12䝷䜲䝤䝷䝸䜢⏝䛔䛶/䜙䜜䛯䚹䛣䛾䝥䝻䝉䝇䛿⪏ᨺᑕ⥺໬䛥䜜 䛶䛺䛔䛜䚸ᨺᑕ⥺䛾ᙳ㡪䠄≉䛻>Ⓨ⌧㇟SEU䠅䜈䛾ᑐ(䜢wÓk˜^䛔䚸Ø䛧䛔ᨺᑕ⥺¿Àø䛾

£㌿䛻⪏䛘䜛タィ䜢^䛳䛯䚹ᮏㄽᩥ䛷䛩SEU䛿DSP䛾ᶵ⬟䛷᳨䞉)ṇ䛥䜜䛯䚹•䛛䛾Ø䛧 䛔ᨺᑕ⥺䛾*䛾9䜒䚸£㌿ୖ䛾ᨭ䛿䛺䛛䛳䛯䚹

(3) ¹_ᑐ㇟䝕䝞䜲䝇䛾≉ᛶホ౯

䛣䛾ㄽᩥ䛷䛿䚸ÉG䝇䝖ᵓ㐀䛾4k×32 bit single-port SRAM䜢ㄪÙ䛯䚹SEUⓎ0ı䛾 ᐃ䛾䛯䜑䛾ᐇ_䛿䚸Texas A&M Ꮫ䝃䜲䜽䝻䝖䝻䞁

(25 MeV/᰾Ꮚ)䛷1997ᖺ䛻^¹䜜䛯䚹¬䛔LET YZ䜢+䛖䛯䜑Ne, Ar, Kr, Xe䜲䜸䞁䜢↷ᑕ䛧䛯䚹¹ _䛩䜛RAM䛿30-100 μm䜎䛷Md໬䜢^䛔䚸Ä ìᑕ䜢^䛳䛯䚹SEUᐃ䛻䛿㒊0䜎䛯䛿1䛾䝟䝍䞊 䞁䜢⏝䛔䛯䚹Û䝑䝖䛾᭩䛝m䛸Û䝑䝖䛾Ãm䛧 䜢ò‹ó䛧䚸Û䝑䝖཯㌿䜢“䛧䛯䚹Ãm䛧䛛䜙Í䛾

᭩ 䛝m䜎 䛷 䛾©9䜢)ṇ 䛧SEUÄ ±䛾 LET ᛶ䜢䜒䛸䜑䛯䚹㒊0䝟䝍䞊䞁䞉1䝟䝍䞊䞁䛷

Ó䛺H䛿䛺䛛䛳䛯䚹(ç3.2.5-1) ç 3.2.5-1. SEU Ⓨ0ı䛾 LET

 ᛶ

(a) 㟼Ṇ㌶㐨䛻䛚䛡䜛ᩘ್ィ⟬

ç 3.2.5-1 䛾 SEU Ⓨ0ı䛾 LET  ᛶ䜢 Weibull 䛾ᘧ䛻䜱䝑䝖䛧䛯䚹!Oı

σ^SAT=6.3 μm²/bit 䛿 50 < LET <60 (MeVcm²/mg) 䛻䛚䛡䜛ᐃ್䛾ᖹÈ䛷䛒䜛䚹

⎥ ⎥

⎦

⎤

⎢ ⎢

⎣

⎡ ⎟

⎠

⎜ ⎞

⎝

⎛ −

−

=

s

SAT

W

L LET ) 1 exp LET

⁰

( σ

σ

P್䝹䞊L0=2.7 MeVcm²/mg䛿䝕䞊䝍 䛛䜙Fᐃ䛧䛯䚹䜱䝑䝖䛷W=20.6 MeVcm²/mg 䛸 S=1.2 䜢@䜑䛯䚹䛣䛾ᘧ䜢⏝䛔䛶䚸Öø䛾 SEUⓎ0䛾ð䝕䝹ィ⟬䜢^䛖䚹

Figure of merit ἲ (Peterson [1] ) ⌧»

䜘‹䝕䞊䝍䛜¤䛺䛔©®䛻Ⓨ⾲䛥䜜䛯䚹㟼Ṇ㌶

㐨ୖ䛻䛚䛡䜛SEU&ᗘ䛾ୖ\䜢䛘䜛䚹8㝧άືrú䛻䛚䛡䜛SEU&ᗘ䛿

( )

25 ²

200 L

σ

SAT

×

_{=1.97×10-7 upset bit}㸫1 day^㸫1.

䛸䛺䜛䚹σ^{SAT䛾>఩䛿}cm²䚸L25=8 MeV/cm²/mg䛿σ^SAT䛾1/4 䜢䛘䜛LET್䛷䛒䜛䚹

Effective-flux model (Binder [2])ᨺᑕ⥺䛾➼X’䛸M䛔䝅䝸|䞁䜢,ᐃ䛩䜛䚹䛭䛾⤖ᯝ䛿

( ) [ (

^SAT

) ]

^SAT

L ⎥× − ×

σ

×

σ

⎦

⎢ ⎤

⎣

⎡ _−0.8

2 0

64 . 0 302 1

CREME96 (Cosmic ray effects on micro electronics) [3]㸸Ᏹᐂƒ9䛷䛾ᨺᑕ⥺䛾ᙳ㡪ホ౯䛾䛯 䜑䛾ィ⟬䝅䝇G䝮䛷䛒䜛䚹ᆅ-¦㏆䛾㟁6ᨺᑕ⥺¿À䜢 ィ⟬䛧䚸+,➼䜈䛾ᙳ㡪䜢䛔À䛔À䛺‘௳䛷ホ౯䜢䛩䜛 䛣䛸䛜䛷䛝䜛䚹ᮏㄽᩥ䛾ィ⟬䛷䛿 RPP (Rectangular Parallel Piped) model ࢆ ⏝䛔 䚸 䝟 䝷ó䞊 䝍 䛸 䛧 䛶 x=y=(σ^SAT)^1/2 =2.5 μm䛸z=2 μm䜢⏝䛔䛯ࠋSEU&ᗘ 䛿 8.1×10^-8 upset/day/bit (8㝧r ¤)䛸 1.1×10^-8 upset/day/bit (8㝧r)䛸ィ⟬䛥䜜䛯䚹䛣䛣䛷z^࡜ࡋ࡚

x*0.2 䛒 䜛 䛔 䛿 x*0.01 䜢 ⏝ 䛔 䜛 䛸 䚸CREME96 䛿 Peterson䛸Binder 䛸—䛨್䜢䛘䜛䚹䛴䜎‹z䛿ãホ ౯䛾.⬟ᛶ䛜䛒䜛䚹

(4) 㟼Ṇ㌶㐨䛻䛚䛡䜛ᛶ⬟

䛣䛾9䛾SEU&ᗘ䛾᭶ᖹÈ䝕䞊䝍䜢ç3.2.5-2䛻 䛩䚹ᐇ_9䛻.䛸/䛷䛩4•䛾CME䠄|䝻 1ᨺ 䠅䛜Ⓨ0䛧䛯䚹䝕䞊䝍䛛䜙CME9䛾䝕䞊䝍䜢á䛝䚸

⾲3.2.5-1. 4•Ⓨ0䛧䛯CME䛸䚸䛭䜜䛻 䜘䜛5䞉1,䞉109䛾ᖹÈSEU&ᗘ

ç 3.2.5-2. SEU &ᗘ 䛾 ᭶ ᖹÈ 䝕 䞊 䝍 䚹.䛸/䛷䛧 䛯 䝕 䞊 䝍 䛿 CMEⓎ0©䛾䝕䞊䝍䚹

ç 3.2.5-3. 8㝧1¶ᩘ 䛾Fa (1994-2008) [4]

SEU&ˆ ©9 ᛶ䜢䜒䛸䜑䛯䛸䛣À7.7×10^-12×day2.5×10^-7 (day䛿1900ᖺ1᭶1,䛛䜙䛾,

ᩘ) 䛸䛺䛳䛯䚹1¶ᩘ䛾Fa(ç3.2.5-3)[4]䛸ẚ㍑䛩䜛䛸䚸1¶ᩘ䛾¤䛻క䛔SEU䛜ຍ䛩䜛䛣䛸 䛜¹䛛䜛䚹

(a) ï䛾+,䛻䜘䜛ᨺᑕ⥺ᙉᗘ䝕䞊䝍

GOES-I䛸GOES-II [5]㟼Ṇ+,㌶㐨䛻 䛒‹䚸14-40, 80-165, 165-500 MeV䛾㝧Ꮚ 䛾䝷䝑䜽䝇䛾ᐃ䜢䛩䜛䚹èº1䜢õ:䛩 䜜‰䝹䞊㝧Ꮚ䛾ຠᯝ䜢䜘‹ ˜

䛷䛝䜛䛣䛸䛜☜ㄆ䛷䛝䛯䚹

ACE + , 䛾 Solar Isotope

Spectrometer (SIS) [6]䛣䛾+,䛿ᆅ- -8㝧䛾 L1 䝷䜾䝷䞁䝆í¶䠄ᆅ-䛛䜙 150 2 km ›䛡8㝧䜘‹䠅䛻䛔䜛䚹ᮏㄽᩥ䛷䛿 SEU 䛻2せ䛺ຠᯝ䛜䛒䜛 70-117MeV/᰾Ꮚ䛾3 䛾䝕䞊䝍䜢⏝䛔䜛䚹

MPTB +,¸Ê䛾 Cosmic Radiation Dosimetry (CREDO) ᐇ_[7-9]㝧Ꮚ456䛿 38MeVÖୖ䛾㝧Ꮚ䝷䝑䜽䝇䜢ᐃ䛩䜛䚹୍X䜲䜸䞁ð䝙䝍䞊䛿0.1 < LET < 20 MeVcm²/mg 䜢16 ž7䛻䛡䛯ྛBC(᭱

ୖž䛿 20 MeVcm²/mg Ö

ୖ)䛾䝷䝑䜽䝇䜢ᐃ䛩䜛䚹䛣 䛾+ ,䛿5ᆅ¶䛜 㧗 ᗘ 39,200 km䛾U8I䛾䛝䛺 9:㌶㐨䛻䛔䜛䚹CREDO 䛻 䜘‹ᐃ䛥䜜䛯䝹䞁䝇䜢⾲

3.2.5-2 䛻䛩䚹䛣䛾䝕䞊䝍䛷

;<èº䛾ຠᯝ䜢õ:䛩䜛䛾 䛿=䛧䛔䚹

(b) CME⌧ ㇟ 9䛻 䛚 䛡 䜛 SEU&ᗘ䛸3䞉㝧Ꮚ䛾䝷䝑䜽 䝇䛾᳨ウ (ç3.2.5-4)

2001ᖺ4᭶ (3᭶29,-4

᭶23 ,)4᭶15 ,䛜Fe 䜲 䜸䞁᭱䝷䝑䜽䝇䛸upset &

ᗘ䛜᭱›䛳䛯䚹4 ᭶ 3 ,䛾 Fe 䜲䜸䞁䝷䝑䜽䝇䛿15,䛾

䝷䝑䜽䝇䛾 1/2 ᗘ䛺䛾䛻

⾲3.2.5-2. CREDO䛻䜘䜛㝧Ꮚ䛸䜲䜸䞁䛾䝹 䞁䝇ᐃ⤖ᯝ䚹

ç3.2.5-4. 䛣䛾ᐇ_9䠄2001ᖺ2007ᖺ䠅䛻Ⓨ0䛧䛯4• 䛾CME䛻䛚䛡䜛䚸3䞉㝧Ꮚ䛾䝷䝑䜽䝇䛸SEU&ᗘ

upset&ˆ1/10Öø›䛳䛯䚹

2001ᖺ11᭶ (10᭶22,-12᭶2,)LETYZ䛾䝷䝑䜽䝇䛿CREME96᭱>್䜢ú䛘 䛯䚹㔜䜲䜸䞁䛾2せ䛺Ù䞊䜽䛿11᭶4-11,䛸11᭶22-28,䛻䛒䜛䚹11᭶5-6,䛻䛿GEOS䛷 䛾㝧Ꮚ䝷䝑䜽䝇䛜1/10Öø䛻䛺䛳䛶䛚‹upset&ᗘ䜒1/1000Öø䛻䛺䛳䛯䚹 䛣䛾9䛻Fe䜲䜸 䞁䝷䝑䜽䝇䛿䛘䛯䚹䛣䛾䛸䛝䚸+,䛿ᆅ-䛾?䛾఩⨨䛻䛔䛯䛾䛻ᑐ䛧䛶 ACE 䛿䛻8㝧¨䠄ᆅ -䛛䜙1502km䠅䛻䛔䜛䚹8㝧䛾㌿<䛿25,

䛺䛾䛷䚸䛣䛾䝷䝑䜽䝇䛾ኚ໬䛿䝺䜰䛾aື䛷䛿ý Â䛷䛝䛺䛔䚹SEU&ᗘ䛾䛻䛿•Ꮚ䝷䝑䜽䝇䞉 䝹䞊’›䛡䛷䛺˜䚸+,䛾¬䜒õ䛘䛺˜䛶䛿 䛺䜙䛺䛔4䛷䛒䜛䚹

2003ᖺ10᭶SEUÙ䞊䜽䛻䛿10᭶28,䛾X17

䝺䜰䛸 11᭶4,䛾X28䝺䜰䛜క䛳䛯䚹䛯›䛧䚸 CME 䛾Xྥ䛿ᆅ-䜢ྥ䛔䛶䛔䛺䛛䛳䛯䛾䛷ᆅ-䜈 䛾ᙳ㡪䛿joª䛷䛿䛺䛛䛳䛯䚹᭱䝷䝑䜽䝇䛿

CREME96 䛾ィ⟬್䜢ú䛘䛯䚹㔜䜲䜸䞁䝷䝑䜽䝇

Ù䞊䜽䛿5•䛒䜛䚹10᭶29,䛾䜒䛾䛜upset᭱ Ù䞊䜽䚸10᭶27,䛾䜒䛾䛿upset䜢ຍ䛥䛺䛛䛳 䛯䚹

2005ᖺ1᭶䝺䜰 X7䛜క䛳䛯䚹䛭䛾1MeVÖ

ୖ䞉100MeV Öୖ䛾㝧Ꮚ䝷䝑䜽䝇䛿䛭䜜ë䜜 1860 particles/sr/s/cm²䞉652 particles/sr/s/cm²›䛳䛯䚹 8㝧άື< 23(1995-2006)䛷᭱䛾㝧Ꮚ䝹 䞊䛾~㇟›䛳䛯䚹

(c) SEU&ᗘ䛾@±

Ù䞊䜽䜢`¶䛸䛧䛯©䛾SEU&ᗘ䛾@±䜢ç3.2.5-5䛻䛩䚹2003ᖺ10᭶/䛸2005ᖺ1᭶ A䛾SEU@±ᩘ䛜᭱䛸䛺䛳䛶䛔䜛䚹B9&ᗘ䛿2005ᖺ1᭶A䛸2001ᖺ4᭶C䛜᭱䜒DE

›䛜䚸CME䛾145-500 MeV㝧Ꮚ䛾䝷䝑䜽䝇䛜DE䛺SEUⓎ0䛸Ñ㛵䛜䛒䜛䚹䛩Ù䛶䛾~

㇟䛿䛚䜘䛭1.5,䛷JF䚹2001ᖺ4᭶C䛿1,֐䛻o›JF䚹2003ᖺ10᭶/䛿1,Öୖ

䛛䛛䛳䛶䛔䜛䚹

(d) FMFFlare Multiplication Factor 䠄CME9䛾SEU&ᗘ䛸䝞䝑䜽䜾䝷䜴 䞁䝗䝺䝧䝹SEU&ᗘ䛸䛾ẚ䠅

⾲3.2.5-3䛻4•䛾CME䛻䛚䛡䜛᭱

>䛾1 09䞉1 ,9䞉59䛾 FMF䛸

CREME96䛾ィ⟬⤖ᯝ䜢䛩䚹ィ⟬್

䛿䚸ᐇ್䛻ẚÙ䛶0ᖹÈ䛷䜸䞊䝎䞊

ç3.2.5-5. 4•䛾CME䛻䛚䛡䜛SEU

&ᗘ䛾@±䜾䝷䚹øç䛿Ù䞊䜽¦㏆䛾 m

⾲3.2.5-3. 4•䛾CME䛻䛚䛡䜛FMF䛾5䞉1 ,䞉109䛾᭱>್䚹CREME96䛾ィ⟬್䛿8㝧 rú䛸䛾ẚ䛷䛒䜛䚹

100G,…È~40G5…È~2-3 G䛾㛤䛝䛜䛒䜛䚹䛣䛾H䛾`T䛿CREME96䛜᭱>್䜢 ィ⟬䛧䛶䛔䜛䛛䜙䛾䜘䛖䛷䛒䜛䚹䛥䜙䛻䚸Ǖ䛿N䛥100mil (Al ь) 䛾;<èº䜢,ᐃ䛧䛶ィ⟬

䛧 䛯 䛜 䚸 ᐇ–䛾 DSP 䛾< ‹䛻 䛿 䜘‹ ¼ ˜䛾; <è º䛜 䛒 䜛 䛸õ䛘 䜙 䜜 䜛 䚹 ᩥ ⊩[10]䛷 䛿 FMF(0)=67䞉FMF(,)=241 䜢/䛯䚹FMF 䛾ィ⟬䛾–䛾䝞䝑䜽䜾䝷䜴䞁䝗䝺䝧䝹䛜8㝧r䛾

©䛷䛒䜛䛣䛸(H䛿2Gᗘ)䜢õ:䛧䛶䜒䝕䞊䝍䛻 10GÖୖ䛾H䛜䛒䜛䚹䛣䛾ᐃ䛜1988-1997 䛾䜒䛾䛷䛒䜛䛣䛸䚸䜎䛯䚸Weibull Q⥺䛾 L0 䛿ᮏᐇ_䛸o›—䛨䛷䛒䜛୍Xσ^LET 䛿ᮏㄽᩥ䛾σ^LET 䜘‹䛿䜛䛛䛻䛝䛔䛸䛔䛖䛣䛸䛛䜙䚸䛣䛾H䛾`T䛿2䛻༙ᑟయG䜽䝜䝻䝆䞊䛾H›䛸õ䛘䜙䜜䜛䚹ᩥ

⊩[7]䛻䛥䜜䜛䛂7᭶14,~㇟䛃䛷䛿䚸㝧Ꮚ䝷䝑䜽䝇䛜104G䛻䛺䛳䛯©䛻䚸DRAM䛾SEU&

ᗘ䛜 30-50 G䛻䛺䛳䛯䚹䛣䜜䛿㔜䜲䜸䞁䛸㝧Ꮚ䛾䜰䝑䝥䝉䝑䝖ã䛾H䛜`T䛛䜒䛧䜜䛺䛔䚹2001

ᖺ4᭶ 䛾䝺䜰䛿䚸4䛴䛾䛖A䛷㝧Ꮚ䝷䝑䜽䝇䛜᭱›䛜䚸㧗LET㒊䛾䝹䞁䝇䛜ï䜘‹㧗 䛔䛸䛔䛖≉ý䛜䛒䜛䚹2005ᖺ1᭶䛾䝺䜰䛾FMF䛜୍㧗䛔䚹䛭䛾`T䛜䚸㔜䜲䜸䞁䝷䝑䜽䝇䛾 ຍ䛺䛾䛛㧗䝹䞊㝧Ꮚ䛾ຍ䛺䛾䛛䜢ß䛻ㄪÙ䜛Œせ䛜䛒䜛䚹

(5) ⤖ㄽ

G1/G2+,¸Ê䛾㧗ᛶ⬟DSP䛿䚸Ᏹᐂ⥺䛻䜘䜛SEU䜢᳨䞉±ṇ䛩䜛ᢏ⾡䜢ᑟì䛧䛯⤖ᯝ䚸

䝺䜰~㇟䛻GH䛧䛯©䜒䚸ၥ㢟䛺˜ᶵ⬟䛧ü䛡䛯䚹Upset&ᗘ䛿䚸㝧Ꮚ䞉㔜䜲䜸䞁䛾䝹䞊䝇S 䜽䝖䝹䛾$䛺㛵ᩘ䛷䛒䜛䚹CREME96䝥䝻䜾䝷䝮䛿solar minimum䛾Upset&ᗘ䛾ᐃ್䜢n

⌧䛧䛯䚹CREME96䛿ᐇ–䜘‹䛛䛺‹䛝䛺FMF䜢䛘䛯䛜䚸ィ⟬䛻⏝䛔䛯RPPð䝕䝹䛾k䛥(z)䛜 䛝䛩<䛯.⬟ᛶ䛜䛒䜛䚹䛯›䛧䚸z䜢ú䛥˜䛩䜛䛸䚸8㝧άືr䛷䛾䝞䝑䜽䜾䝷䜴䞁䝗䛾୍;䛜 ˜ 䛺䜛୍X䚸8㝧άືrú䛷䛾୍;䛿>˜䛺䜛䚹Peterson䛸Binder䛾ィ⟬䛿䝞䝑䜽䜾䝷䜴䞁䝗›䛡䛷 䛺˜䝺䜰©䛷䜒䚸SEU&ᗘ䛾ãFᐃ್䠄I䛺Xྥ䠅䛻䛺䛳䛶䛔䜛䚹

(6) ጤဨ఍䛷䛾ºJ

1䠅SRAM䛿DSP䜔ASIC䛾2せ㒊䜢ø䜑䛶䛚‹䛔LET䛷䜒SEU䛜Ⓨ0䛩䜛䛣䛸䛛䜙䚸SRAM 䜢ホ౯䛩䜛䛣䛸䛷䚸DSP➼䛾¯Žᛶ䛿®⾲䛷䛝䜛䚹

2䠅CREME96 䛜ィ⟬䛩䜛䜰䝑䝥䝉䝑䝖s䛿䚸90%¯Ž䛾ୖ\䛺䛾䛷䚸ィ⟬䛭䛾䜒䛾䛜ãホ౯

䛻䛺䛳䛶䛔䜛䚹

3䠅RPP䛷⏝䛔䛯z =2μm䛸䛔䛖䝟䝷ó䞊䝍䛿䚸0.25μm䝥䝻䝉䝇䜢¸䛳䛶䛔䜛䛣䛸䜢õ䛘䜛䛸䚸䛝䛩

<䜛䛛䜒䛧䜜䛺䛔䚹

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ドキュメント内 JAXA Repository AIREX: 最新デバイスの耐放射線性強化技術に関する検討委員会: 平成20年度成果報告書 (ページ 49-55)