JAERI-M v.-tf- r li, B^WTAgf^BfrAM^^MI^fiTiJL "Cn «? »?- <, Ae-OP4] -fe-ir.'i, H«f.Tj«f?Ei?ftt*flH«««**ft* (T319-ll****Si* SJtitt)»«S»m*B#H! ; J

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1 J A E RI - M K*ran>i&fM!ss*m-i *?2H a * * * a w % m Japan Atoihic Energy Research Institute

2 JAERI-M v.-tf- r li, B^WTAgf^BfrAM^^MI^fiTiJL "Cn «? *»?-* <, Ae-OP4] -fe-ir.'i, H*«f.T*j«f?Ei?ftt*flH«««**ft* (T319-ll****Si* SJti*tt)»«S»*m*B#H! ; J-»»ttBrl*J) -C-Srei-i: **««** *. ^ti; 1 ) *<t. JAERI-M reports are issued irregularly. Inquiries about availability of the reports should be addressed to Infocmatkx} Division, Department of Technical Infonnation, Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, lbaraki-ken , Japan. Japan Atomic Energy Research Institute, 1985 B2*aenei*3t*tfc

3 JAERI-M mm & && % **j A»as* + (1985^1 E18B5SS) /hsffl#«***ffltt*i:tir-192 «tfflbijilofc»ic. «tt»ttsat«i' -y 7 Ht±**tt^ga*K«l*RtfJfcttlrt6*«L*: 0 * *S* mm, W* 0.4mm (D-<tm<D9-Yy h *J Lfc 0 t *-y-, He,t Stti-StTlMitt J MT R Jt*Nc J: otl #!! *:») 3«?-y-, ht?370gbq ( 10 Ci ) *«««T*, 1 *ffi3 m*&xmmk z>7**ir7 7(D3v h?^ a»«tfjtbd«;&tf*«mb«aj ^if-^fco * «, lr-192*)li iffl»tt*lci:57i'*^5 7^ lik*'tl< ^Ci *i*jwlfc. /hffi?-^-y Hc«fc5tt*Strir-192l«i((i*«**aE««[if4Lr «Eft**** ii felt, 5 {ft ^ *5- *>+»»#?# So * wmnm* (l)

4mm (D-<tm<D9-Yy h *J Lfc 0 t *-y-, He,t Stti-StTlMitt J MT R Jt*Nc J: otl #!! *:») 3«?-y-, ht?

4 JAERI-M JAERI-M Development of Small Sized ~~~Ir Ir Sources for Non-Destructive Testing Hisashi KATO, ~ Akira SATO, Hiroto KOGURE 田 and Nobuo WA0A + Department of Radioisotope Production, Radioisotope Center, JAERI ( Received January 18, 1985 ) 192 A method of obtaining a compact ~~~Ir Ir source with a high gamma-ray output is described, which is based on assembling of thin targets after neutron irradiation. To determine the optimum size of targets, neutron self-shielding factor and ~asured specific activity were measured for several iridium targets with different size. Then we found that the target of 1.6mm in diameter and 0.4mm thick was suitable. A 370 GBq(10 Ci) source consisting of the three targets was obtained by neutron irradiation at JMTR. For adjustment in source strength, it is possible to assemble up to five targets for each source within 1.6mm* x 2.0mm in size. The parameter affecting on the image quality of radiographs, namely; contrast, penetrameter sensitivity and unsharpness were measured by the use of assembly sources with different size. The effects due to the source size were not recognized within the experiment. The assembly sources have excellent performance characteristics for gamma-ray radiography, contribute to stabilize those supply for users even if the specific activity of the irradiated targets is lower than a predetermined value. Keywords : Ir Source, Gamma-ray Source, Source for Non-destructive Testing, Neutron Irradiation, Neutron Self-shielding, Radiography + Application and Development Division (2)

5 JAERI-M 8S-011 e & i. **.## i 2. * -y? t-oss 1 3. J MTRiCte^5KI»Jfa» 3 4. ラジオグラフィ 7 >J*y<77 ^ttffismi 性能試験 H H H H H -... H... H... H.~ SUfj^ffi y h 7 x h t m m *»«&* 5 5. *S 16 -» 6 #* «* 7 Contents 1. Introduction l 2. Selection of target 1 3. Test irradiation at JMTR 3 4. Radiography capability testing Method Contrast Resolution Unsharpness S 5. Conclusion 6 Reference 7

2 3 y h 7 x h 5 4.3 9t m m 5 4.4 *»«&* 5 5. *S 16 -» 6 #* «* 7 Contents 1. Introduction l 2.

6 JAERI-M * A *>* fck»*«4-kj <flj8sftt(,"'3o B*S^P^W!eBr-eii^iaft2500«(»«1ilcL-C 1.4 PBq C38kCi3)OIr-192«Ji^«*WK«!J6t, Sfllcfctf SiiS^lltoT^So 0 Ir-192««ioaS*KfcoLr(i. IM»K*,fc$ ft»i'^ti(»is. * #»#» SfflIr-192ililiLT5i?*^77^lca[LfcaK *«io*«tti*kfc^^-s«^^k^0 Ir-192««l4 1«^fc»)CDiRW«IAS«fflNfK*J^T*iJ;*370GBq<ftl0Ci)i«5* #**»T ^J!pTr3ft+tt^jia»*n5*i. mti4kmtmw>z.vizm&-i-t i>*>mttwa,»*tt?*«#isi0 «*TNte>*ittt,>4. *o«c»i6tt«esntt<tts. cna^ ra «it«*tth *M***tt<3ft. «ffi#fcfci>lt:fc*ttlb«*j5;l.5*fcas. c ±? Kiii^ #*j#e%ksi[aitb ; fr«a -3 ti**4vui, ««*o/hs!? -y» h «*&*># J; ottt»ft*i-s: is*««l;fc. co^ittttulin w h.'4»» «g tft.^#, *iftn., hflfc*tfs lr-192iml tt»ibffltf&o***;i5t4a4'fc.?t*&4%il&*l.s l, *»***IC*i^5 Ir-192*iili. *<D&#.K<fc ot5?* ^5 7 Ir-192«i!O^S*^#^4«lI* { ffitl«;^:«l*li«**n5cilci, < 5cOTr, Ir-192 «6«^-)*iitii*5fc"tf/h*^ii9*sa4Li.^ itzw^xm*&r ir-mm* m&nm IcA-^T&iF^-tfft^lJ. «ffls»*oan*> > ««* 4 a*. /J\S! # - y * h»c J; *tt#: T Ir- 192*** nrtfi9: > * S&* «>S Wffl Plffi*» 6* WLfc. +tt^)gwlc<tot*!5ic4s -r5 Ir-192**»C*«feW:. *-y-, h JSm*ffl*MH* *3»*KAftrt,ttlMllc»L-C*«Kfii» tttts. t i««lce*-#-**htt. 1) #-y w h ffiflnc*itf-s#tt ; pj *«S*ttffiT w 2) 4 'J *9A 4>tt?ft«Ka5«#*#^fc»+tt^!&<*'-yw h*ffi lsm*t?««s 3) 3!fy»»aj**iIr-192*ita#KJ:oTil«*ft. tt**g**jijh*±ffit-?>-s 3) 4i*ffll«^fcr ft5. Jin6. *H 9-B2)!ittJtt : Fga»*i^tfn, <fe *B4ifc«LT»i-»T»l*'**<, J*iMM6 «T*5l*8 *SE»aE^?4ao-COS. -t B*K*i^<*V>tfiJELT»fctt»i[4, ttilt**n*. t CTCttJMttt*!*?** * B*«fiT#*f<.. *ft^y-7 aa*«***«-t?#«4fiffilyi:«^-e*«o #«?

*«#isi0 «*TNte>*ittt,>4. *o«c»i6tt«esntt<tts. cna^ ra «it«*tth *M***tt<3ft. «ffi#fcfci>lt:fc*ttlb«*j5;l.5*fcas. c ±? Kiii^ #*j#e%ksi[aitb ; fr«a -3 ti**4vui, ««*o/hs!

7 JAERI-M ~ t itfli#tt?gs*ifc. 2, <* *? o««ifffi*. ViSli*-y7HB#«i*B aitabso C fi<hs*ffl^r^tt *t 5>f *)9*>J*9-? l- 4'«: : P B**«tt*#»SI*HiiJtRLfco 4'jS>*A*--y HiSS WGHERAEUSttK J;-,TS»tt$ftfc fco&fflls S(s6fflLT^5*-y7 h (JiS 2. 0mm. SS 2.0 mm ) Jtft Lfc #14 ; F».ftfic3fc-oTii)(g«+ + y-fe^(*i *-<r v man8k*tf 54itt^a*fiT i5«**tt «&*fc Tablel&t;Fig. IK**. *!& * **>&, #tt?se*ikffli5» 'M < LT tz 9 ->f -J I- (ijs+«r *^K A = r*«*#«*ifit-r5 4 ^ -5ffiS^-53»*«- l *ISC -T. *HBTttJtt?gB*iK»* H; fc»lcteffllfc *--'!r* Mi. ffiie L*: J: Sfc-t h*jmtrflto*( 520 ISM )M»Lfcl# j **fftffl!i3 *l ft#l. * &* ^6ifi*3S:TIr-192aHil*fi;Sfc*3 370 GBq ( 10 Ci )«± isc»*l«-»5fcfck*stt /J\3!*-y* h»%*»fco 21*X«. «*«Table 2 lc^^- 0 +tt?g ^MMmwmf J MT RIBWOltS***^ & J*St*fi8#i* <,»»«* «KT im&.%tzlr)0m*2.xm»<dmmmmi) i fc^?-fy Hiita2.0mm, i»0.1mm ifi S 1.6 mm. flt $ 0.4 mm 2«SB * -Y v h"e* o CftftO*-*'? b*ffll>ti4c Ir-192*«0-tfJ (ib&2.omm. $2.0mm ) *«AttV»«HT?*i*A-C Ir-192»ji *3l*-r5. I*ffi3fc»3««5«(*ai.6mm. **0.4mm ) *>&*j«20fll ( fig 2. 0 mm, HtS 0. 1mm ) 4t L «ffl-c! ori6-c! *»J. «*» '* -f?! "?*«. L*>L l^firicg^-ii'-y-y h ««li. M^'*lXH»A>?.*«^-5i-C i t5fc"tl-^ittl-«a-5*«i*u>. fil± *tt*il)a^**-yy hilt«fe«lfc*tttt«ai.6nin. W*0.4 mmt*5 *HllrL. tt*ftt Ir-192 MllB<D/hS*- ir? h t LTlttSCiKL/:, -2 -

ftfic3fc-oTii)(g«+ + y-fe^(*i *-<r v man8k*tf 54itt^a*fiT i5«**tt «&*fc Tablel&t;Fig. IK**. *!& * **>&, #tt?

8 JAERI-M JMTRKfcttSHlfclUt Sg#WfcBit*;hT^*#IMUttJl Ir-192«* flftli. 1 BJftMifc <0 360*T?* So /jnffl#-<rv HC«fc5«S«(i, tt-mttii 192**1 Wflr3*:!3 3&TM080 «lctt5 B*m^^jBf^arTftt. tffl 5lc3t*rt>o/Jx Ir-192il* j*pi «ft# JMTRlckS&BIHJBTrU:, *l$4 q i;i!b***fl=fctt4.fc-5 1 * JB#* + 7*-turtle ftu#-y» m»[*9i2«tlfc. )ia»iiir-i92ifcjioifca[«ii*m*5^tfw<-r5 (*&520«jllfl >ftr>fco JMTRIc*ifcf5KH!H«0SII»0)l8«*#i*S**Table3lc^-r i) tt ftjimr?(i : F 3 れていた n-r^fcih»«p H*J*Sll0«T 5 ofcffltf, 照射時聞が約 10~ 彰下回ったので, 通»* llm**]«l*kj:ot»&;ft3*#fc M 常の 1 サイクル鳳射によって得られる放射能の健 «fcfcti-t*lfc t*lmb*lcj:si!s«i6litable 2 K* Lfc«Jt*K»L. 20ttl> L26#ffi olf*5. cintpfko^ i) >Jt>M.9->f-; h*b»&*;fc*:» +tt : F5fc*«8*6<jffi T **K<fc* *> **. cn68)*l*5, tt*a;r Ir-192KiilJ)lfi:Sfct) 370GBq»6nfc»^Kii3fi*iiupitt5o *fc*i«tmrf*«8e $i«#*fr&4-f*tt»i6 wr& Ir-192i»!iffli-S(iaa2.0mm, * 2.0 mm ) BHrtT? 5«*T' /hs* -V? h*tt * *>#* C4*"?1l6T?*«o Ir-192*6*a*n«#y«'l» i*^4 f li400kevg«tit«wc<, -#*1U 'J? 9A «fle(ii«l>/;a&, *»ft«k* McD^-y, h***«fct*f**5«#:fi:tiri92«**tt«-y^i(ioia««**hi+*»*jr#tti.>. #«*> &. a*ir ir-i92nai K»ill#yI«)i3Wl»IlcJ:- J Tft*tf±tTt5CiKtt5. #*«*** &# 5Ir-192*ilfflttlrttt im^3wfctt»t*«lmp**ff*>*i. 7i»*^7-(ffl «!U f****m**l5. *CT?«*S:TIr-192«l[KJ:5#y^l (OiBltll**»4fc»lC. /ha#-y» h#fl^?. *, >'T!iffi* ai»tt4ifc«lfco *»»«*«: «J l-3{rfc M*, *(q]ko^t*36lfc. iine.ffl*«l*pig.2k*-ro «* -Cllilffifc»LTSB Sj icaifi^y^maiijo&tma. 3tti>L4«*-y* i- «#»*>-ri7ttv>l2o#«flt Kit*. Lfc#-*T«*:4TIr-192«***ffi + 4» ttl*ifili. C #>"* **fib#«>* 8»*ttELfc**JH>ttttfttftt&ttW. **** &. l*ffi^fc*3 370GBq ( 10 Ci ) - 3 -

)ia»iiir-i92ifcjioifca[«ii*m*5^tfw<-r5 (*&520«jllfl >ftr>fco JMTRIc*ifcf5KH!H«0SII»0)l8«*#i*S**Table3lc^-r i) tt ftjimr?

9 JAERI-M ~ 示すガンマ錬出力 l«sfc»3 0»»llli«fil48GBq ( 4 Ci)#& -e*.5o C CD t(±*f*0 J MTRIC J;5a «Sa«^&»t»*lfc*fi&«gl67GBq (4.5Ci)4ifc«LT+»it#L»5fcO-e*5. «±*>6, JMTRI«K 4l81.6miii, J*S 0. 4 mm /Js? -y - y h *tt*3 T Ir -192**iLr»JSLfc«^. l#&afc0 3**ll!piLfc^370GBr(10Ci) ffilo *y-7*m**llft-f*cittnr 6-e*»). * *ICj;oTBISSLfc/hMIr-192»M i# l * -«it:ir-192**(cj:5 7-^*^7 7-ftt, lihbffkfetf Stt* fe **lttkfb tttt! tt te fctfj : rsi &l±i *lt» fi : -3#, * tt**4*jii«* **3a*5MMe SS* 3tJ +a *Cttt*fi:-C/J'>fflIr-192«IH[(aai.6mm. ** 0. 4mm ) «*! H-ikSiJflESCX^iPlftaE^^aWtefFtf Lfc tfch^ksffiipjffl$nt^5 Ir-192*MP4 4.1 JSHttr* /Mi^-y-y nc<k5«a*itir-l92«iili, ^ft«qfl<*tt5'm#-y» h l«場»6t3lll 5fiJffllcjai"hffl*-'>'» 合と実際の利用 I~ 近い小型ターゲットl- 3«*fcl*4*» K:o(,>-c. 個または 4 個の場合について. 形 ^ikmlccfcis**** 状差による効果が ^^U^^-^<t -aicai^^o lr-192«* tttl*table 51~ K**. 示す各 Ir-192*»fttW*> 線源は取り扱»^*8JJR:+ いを容易にするため 5fcW18mm, 外径 8mm. 長 &$20mm さ血の T* 7!J リル >J ;HIHBK SSKAtt. 樹脂援の容器 I~ 入れ. 上 ±«*>6 S # 部から同樹脂 ISifflT-J^JJALTlilLfc. 製のプラグで封入して固定した照 M*f»»ttlr-192**fr 射撮影肱 Ir-192 線源からの &!*«*** 放射線が 4π 4.rSlSlfcttttifc 方向 1~ 1Jt 射さ ft*^*>*«^y 5^JH»fflttll-elfr,fc. t *ftai*li: J: **««Sfc»Ir-193*, 7^^A^i ij«hffl*ffiaa*ffia>&+»rilte«lfc. Ir-192*«iii7^^A e ittlmil, 7**^?7 *fflimtt*s^i;*^fc^«l*lj fc4ic3r! «fle#fc られるように &ft*j:-3krseufc. 設定した撮 *«fcli+*be«l4 ~I~ 結中感度徹桂子 : F Xl 7-f^A(»±3?H7-f^AKK«, の X 線フィルム富士写真フィルム製.## 100), JliMHc <**&«**«(*W 0.1 mm, *#0. )を 2mm ) fcffil»fc 用いた銀 ««K«frlc(i40 影 Z 式. 片 I~ は mm, 30mm, 20mm &tf 10mm 4»«A> bis***»&#tt*fr ffl^fc 6 ^* «*fc れるいわゆるパノラ 7 照射の状態で行った乙の際散乱練による~.を避砂るため Ir - 4 -

* *ICj;oTBISSLfc/hMIr-192»M i# l * -«it:ir-192**(cj:5 7-^*^7 7-ftt, lihbffkfetf Stt* fe **lttkfb tttt!

10 JAERI-M a v h? X h AD r/«at cctrij7^*a3vi.7^b, >l^itt^^fro7y^7»iljr«tt(c^^,). Ati*fcB jp ft***** 7.< * A r ***ttl Lfcttr*. 7., */>«* 2.0 Icfct^T**} l. s r **<» h tltzo -ft. Ir-192*>& 7yy-r* il»c*j^-5»c*«[*0.54cnr 1 ifi3elt! > ±SJ: *3il : S*$K*tLr»e.n«5i'*^7 7 3 VI-7* h**»fc 0 * la**fig.3ic7s to $f>k^tt *tt5#ir-192j )ilco^tlm -C»e.nfc3y V y 7. h *Fig. 3 IC 5«f lc*to»* ftm*k,kotir-192 #:'^l 3ISU*;M^«fc»). ISJRKllCay h 7 *-y» K»m*Z.rm9L&mt>^rt>, 4.3 7} j* It *3H» «fflt*it?ttir-i92imj fga!ix*,u*i4 ^»n«'s«wi!:*j65fc«!)aaaew-i(8!i*&^«i^jib*»^ttiiit 7 -f **««*«; ffl«m***t**ib**il«u Ir-192»» «tt«lcj;«**-«fco *aij* * «t.-«w(c«ffl*ntosw*ma«*ltkj:- 5 r}fofco #Ir-192*i( ttlut IPSItttt*ilsq*ffl* *&»*Fig.4fc*+. #JM«1t K&li. aa*tm*irt>»s * Al**LTl>5, Ir-192 *. J I SMaaBMtWMK** 2#«Tlctt* tt*ls*il2tt^l15mmb(±-e*5i**)*lt^5*i*, *IW»KfflV^^ttl Ir-192 Ji ic-3^tiik**#»tnifj:tie.ffl ittii<-»lr^5. ffctt*i:-cir-i92«i* #' -*? HftOl, SS.KSS Ir-192lM(i li8«*ki4#*<i;*l4b»6nttho 21 fifjr. aa*tt«88bea>&llfc»)imb4i^*i Ir-192 lli(*itttltt««ffl* 3 l4l*i ft <. 5?* ^7 7.< Kj8S.*tt««IK*<iATl»S t#a SttSo 4.4 TffftK 7?*?7 7 * K*st*5«^*»i(t4 LTI4 Ir-192 *«*«*«*#, ttiltt!?* Ir-192«tt*IIIK* ft#*-jeklth-**0^*ilk*ll*l. Ir-192** の «tthkj;s*«-«fc. 形状差による~ を調べた. 不 *!MBK iueiifi«.5fc*t.fc5le... 隠度の測定は g. ^Onayea-? lc±d7'n^7.mfcstt"c^*klaieiij*', KJ:,T?T-3fc. «***«: * 4 * n 7 * l-fyih*-* **">fi* :i0*m. jft 100/»m. 7 S>* ^ 7 x* + v- v jn&m : 0.04mm -5 - ストの実測値 IC 形状差による~ が現われるかどうか綾討したが有意差は留められず,たとえ

3 IC 5«f lc*to»* ftm*k,kotir-192 #:'^l 3ISU*;M^«fc»). ISJRKllCay h 7 *-y» K»m*Z.rm9L&mt>^rt>, 4.3 7} j* It *3H» «fflt*it?ttir-i92imj fga!ix*,u*i4 ^»n«'s«wi!:*j65fc«!)aaaew-i(8!

11 JAERI-M /S, x* + y-y^il:8mm, 7?*77?± l ilj «: 8 >.mtf*5o 7 s?* «7 i l 0 ^ t V-y^ffiBli»fttta*K-#tt^*# (««**»*) i. 7 -<;l> Affile, oeii^itstilfl^w*^k J: 4^»*K#*fe/JN* ^ i#x. &tl S»attKilJt»10mm cdxr-yypfltffofco H*K7-r *A P IMKiM*tt!W eiifc **«««**«* iaot», Bli!;ttai»M'J!tl0mmi40mmffl^r-/yico^rfcifce*«*ftofc «Ir-192««lcol^T^»(K**iKSLfctt**Tab]e 6K,?>f * a 3 v f*. - # \c J: 5K1asen ffi;fl-r-* «* Fig: 6K*+o HHttUfgfttKIIH'fflOmm 440mm ICfctf Stti^f-i'S-TBLT^*,, 7i?*^77±Oi )Sli*KfiKol>t5AT!Rn,fc. Ir- 192 ***»«* IC«fc 3 **«*{*. «tt**»t^*<lltt«[a 1.6mm Ir-192»**S 1, ag2.0mm # ifc«l-cfc* f± <IB*!> >*i.ft;!pofco tftli*** IC Lfc Ir-192#«*K«fcS^»««*J h -** *«««IEtfc-iT*»T/J\* <. II «-t#5iai* l5»#tt*»ofce: *LTl.*S,, *S». ^»«6*IC-D^rtt Ir-192*«S *.#tft-^ *:#&?&. **m*^ tm^*tt5t ftx fflt"*se±#itb^nfc 0 5. & it #«***ffl Ir-192** ^-y. y hffl/hsftll. *tt J fsb*k«i*i!:j;5jt»:««6'n ffl»*^i***jif**., :Lr«aitffi^6*fc*#<C^o3ti[a 1.6mm. flf* 0.4mm «*U KitBA> 製造面から &!!. «. 見た縄合, 乙 i 'M?-r*7 の小型ターゲットMiJMTR I~ 1 1M ^^JBWICJ; ^TiK^i-C Ir- 192«Iil$l&lSfct)3«/hi!*-y-y ht37ogbq(loci)«±0i&*m &#*#T'#, S &KSS «8pTj-i**tt*t-ai«* 5«4-C ib*at««*<hri6ift *)!»*«= li**k 5fe#S*x5o»*aiT Ir-192* *ICj;5tt»t6HlE{i«ffi #- ««it'li^^rfift<* «t^ ft»6kw^tt*«0 1) M»*fr *»Tf*«ttJH««*J»6nft*»ofrl 6 2) ** «tf o##*#<. ii i& im****xs» 3) «a«**t»;6> &Jf#l#«* T? ac*h60****ie L T^te* 5* 度 «**SLfc^*. を測定した結果,ターゲットの * -y > h ** <}: 個数差による *«*~- 15»ttft<. 像賓への~.はなく.ラグオグラフィ 5 ** ^7 7 ^ffl«#i 用線源と LT+i}fJfflT?# 5 C i^^^ofco 以 fil±a>s'hffi#-y» 上から小型ターゲットによる Kcj:S a*a:rir-192««itt. 組み立て Ir-192 線.,~.#»***««* 非破纏検牽用線頑と LLT*ffltt* て適用性を *x.fct>- tf**ci***b-e#fc

$- # \c J: 5K1asen ffi;fl-r-* «* Fig: 6K*+o HHttUfgfttKIIH'fflOmm 440mm ICfctf Stti^f-i'S-TBLT^*,, 7i?*^77±Oi )Sli*KfiKol>t5AT!Rn,fc. Ir- 192 ***»«* IC«fc 3 **«*{*. «tt**»t^*<lltt«[a 1.$

12 JAERI-M * * 1) H.Kato, H.Kogure, K.Suzuki : JAERI-M ) **rgje : mj-ijxm, 17. (12). 68(1971) 3) **26IE. *»3r«jt, IBM X : B*IS** i6, 12. 4, 174(1970) 4) R. G. Nisle : Nucleonics, 18. (3). 86(1960) 5) ** A, Aiii >K, &m %. sin m : *2mmx.?>ztsirtzm&.KXWK&M. 3 P-n-3, **(1984) 6) B*#«*l**tt li : HMRJtftJtffK ( ffk ) BTiJI*ifMa. 3KSU978) 7) R.Halmshaw : Industrial Radiology Theory and Practice, 30, Applied Science Publishers,!~Ol London 凶 and New Jersey (1982) 8) B*J»»ttH&7t;*tt^«: #y-*«aii«ljar3. B*T4 V h -?-»&. * (1970) 9) H.A. Klasen : Phillips Research Report, 1. 4(1946)

3 P-n-3, **(1984) 6) B*#«*l**tt li : HMRJtftJtffK ( ffk ). 313. BTiJI*ifMa. 3KSU978) 7) R.

13 Table 1 Neutron self-shielding factor for iridium targets Target dimension Neutron self-sh lelding factor Diameter x Thickness Calculated Observed (mm) (F) (f) 2.0 x x O.S x x x Table 2 Estimation of radioactivity of 'J~Ir assembly sources for the irradiation by JMTR and number of target for 10 Ci Target dimension Diameter x Thickness Target mass Radioactivity Specific activity Number of target to be contained (m) <"9) (Ci/p1ece) (C1/S) (p1ece/un1t) i.o x x > x v x v3 1.6 x v 3

48 Table 2 Estimation of radioactivity of 'J~Ir 1 9 2 assembly sources for the irradiation by JMTR and number of target for 10 Ci Target dimension Diameter x Thickness

14 Table 3 Irradiation results of 192i r sources inomtr Sample No. Irradiation hole Irradiation time Thermal neutron flux Radioactivity Radioactivity corrected to 520 hour (hour) (cnf 2 ~ S' U, (Ci) irradiation (CI) Avg. Max. Hin. Avg. Max. Hin. 82H-16K-3 G-ll x M-16R-4 G-U S.O I * ~~~Ir Table 4 Required radioactivity of effec~tve assembly source to obtain the effective radioactivity of loci taking account of self-absorption Number of contained Absorption Effective radioactivity of Effective radioactivity Urget coefficient assembly source per tarqet tpiece/unit) (CI] lei/piece) «

Avg. Max. Hin. 82H-16K-3 G-ll 458 2.5 x 10 14 4.7 5.2 4.2 5.3 5.9 4.8 82M-16R-4 G-U 458 4.3 S.O 4.0 4.9 5.7 4.

15 JAERI-M Table ft.j~ir Ir assembly sources used for radiography Source co"ti1r~~ Number of contained Radioactivity target (urn) (piece/unit) (Cl/unit) 1.6* x 0.4* 2.0* x 2.0* Table 6 Measurement of unsharpness Assembly source Fila density Unsharpness («") Step : OM Step : 10M (P») 1.6* x piece * x 0.4* 3 pieces * x 0.4* 4 pieces * x 2.0* 1 piece

(piece/unit) (Cl/unit) 1.6* x 0.4* 2.0* x 2.0* 1 3 4 1 2.9 7.8 10.3 14.

16 JAERI-U li 1 ninr i jndjno Aa-eiMKB pazutauttt o JOJMJ t«ipl>ii S-iias uejineaj -U- JAERt:~.. イト~

17 3 ~ > M W Steel thickness (m) Steel thickness (urn) Fig. 3 Measurement of contrast

18 JAERI-M ~ _ 4 ~ 2.0««II* x Z.Onm* 1 piece -13- ~ ~ 5 3 ~ S 3 _i_ I I I _l_ Steel thickness (am) l.&m* x 0.4m 4 pieces Steel thickness (mi) ~ ri 3 司 ~ la i* i - 1.6m»* x 0.4m 3 pieces X 40 Steel thickness (m) ^ 4 M i U 4J I F1g. 4 Measurement of penetrmeter sensitivity 1.6nw* x 0.4nm 1 piece Steel thickness (MI)

19 I JAERI-M SCANNING MICROOENSITOMETER (SAKURA-POS-15) Slit: Width W\m Height 100pm A-D CONVERTER (YEW-2805) PEN RECORDER I - i GP-IB CONVERTER (YEW-3466) MICROCOMPUTER (HP-85) 16k + 16k byte PRINTER DISPLAY J D Fig. 5 Computer controlled scanning nrfcrodensltometer for measurement of unsharpness -14-

(YEW-3466) MICROCOMPUTER (HP-85) 16k + 16k byte PRINTER DISPLAY J D Fig.

20 JAERI JAKRl ~ =? 3 Step of steel : Omm/lOmm Unsharpness : 483pm Distance across film, 8.15mm >. 3 c ^«^>o'*l " : nr\ i m» Step of steel : 0mm/40mm T >**»" * »«>«.», * * * * ' " Unsharpness ym fil~. Distance across film, 8.15DM Fig. 6 Measurement of unsharpness by Klasen's method -15-

$film, 8.15mm >. 3 c ^«^>o'*l " : nr\ i m» Step of steel : 0mm/40mm T >**»" * »«>«.$

Visual Evaluation of Polka-dot Patterns Yoojin LEE and Nobuko NARUSE * Granduate School of Bunka Women's University, and * Faculty of Fashion Science,

Visual Evaluation of Polka-dot Patterns Yoojin LEE and Nobuko NARUSE * Granduate School of Bunka Women's University, and * Faculty of Fashion Science, Bunka Women's University, Shibuya-ku, Tokyo 151-8523