1、 KSKSKSKS KSKSKSK KSKSKS KSKSK KSKS KSK KS KS B ISO 12721 L/D KS B ISO 12721:2008 2008 8 25 http:/www.kats.go.krKS B ISO 12721:2008 : ( ) ( ) ( ) : (http:/www.standard.go.kr) : : 2002 10 21 : 2008 8 25 2008-0437 : : ( 025097270) (http:/www.kats.go.kr). 10 5 , . KS B ISO 12721:2008 L/D Non-destructiv
2、e testing Thermal neutron radiographic testingDetermination of beam L/D ratio 2000 1 ISO 12721, Non-destructive testing Thermal neutron radiographic testing Determination of beam L/D ratio , . 1 20 1 000 L/D . , . . 2 . 2.1 L/D , (D) (L) . 2.2 ( ) ( 1 ) 2.3 ( .)( 1 ) 2.4 , . KS B ISO 12721:2008 2 1
3、2 3 4 5 1 3 L/D , 7. . . 4 L/D L/D . L/D , . 5 5.1 ( 2 3 ). 450.25 V . V 2.8 mm 21 V( ) 7.1 mm V . d 0.64 mm V . 450.25 . 150 L/D 4 (B ) . 0.64 mm , 7. 0.64 mm . KS B ISO 12721:2008 3 : mm 1 2 (6061 T 6) 3 4 5 a . b11 ( 4 5 ) c20 ( 4 5 ) 1 A 10 mm (22 ). 2 B 20 mm (9 ). 3 C 25 mm (1 ). 4 . 5 . 77.8
4、mm 11 134.3 mm 19 (56.5 mm 20 ) . 6 . 2 KS B ISO 12721:2008 4 a) ( ) b) ( ) c) 3 : mm 1 A L/D 150 2 B L/D 150 , 300 4 L/D 0.2 cm 0.5 cm KS B ISO 12721:2008 5 6 6.1 . 6.2 . 6.3 2.50.4 . 6.4 . 6.5 7. . 7 7.1 L/D . , . . . 5 10 . , b . L/D . L/D (b/d) (1) b( 5) d . L/D 100 . . 1 2 3 1 4 2 5 KS B ISO 12
5、721:2008 6 7.2 “0” . 6 . 20 m300 m , . 6 , “0” ( ) b . L/D 300 . L/D 300 b . 1 2 3 6 (1: 1) 7.3 7.3.1 L/D , L/D . 20 m300 m 50( ) . 7 . 2 , . . . 100 L/D / (cm) KS B ISO 12721:2008 7 L/D 0 cm . L/D (100 ) 0 cm X2 U0 . : mm a 7 (50: 1) 7.3.2 b b . ( ) . . . b ( 5 ). 02111)/()( XUUXUb += (2) U1: X1: U
6、2: X0: U1 , L/D b/d (3) , 0.64 mm L/D . 64.0/02111+= XUUXUDL (4) L/D 100 , . 64.0/02020+= XUUXUDL (5) U0: aKS B ISO 12721:2008 8 X2: U2 U0 0.64 mm , L/D . 2264.0/UXDL= (6) 7.3.3 . ( ) b x . L/D b/d . L/D 200 . KS B ISO 12721:2008 9 A ( ) A.1 A.1.1 L D . D (2 cm ) L/D . , A.1 . A.1.2 (D) (d) (b) , L/
7、D . XYZ STZ L/D b/d . L : D : b : d : b L L L b . L . b L/D . 1 2 3 4 5 A.1 KS B ISO 12721:2008 10 A.2 A.2.1 L/D L/D , 20 250 . . a) b) c) / d) 1: 1 L/D . A.2.2 , 1 000 L/D 2 3 % . 250 L/D 5 % , . A.2.3 . , 4 cm 4.5 cm L/D (4/0.064) (4.5/0.064), 62.5 70.3 . 12.5 % . L/D 20 , 0.2 cm 16.7 %(L/D 18.75
8、21.87 ) . A.2.4 . L/D . L/D , . L/D . . , L/D . . KS B ISO 12721:2008 11 KS B ISO 12721:2008 . 1 1.1 20 1 000 L/D . , . 1.2 2002 ISO 12721 (2008 ) . 2 a) 2003 2008 7 8 KS A 0001( ) . b) , . c) , . L/D 135513 7017 (02)60094114 (02)600948878 http:/ Korean Agency for Technology and Standards http:/www.kats.go.kr KS B ISO 12721:2008KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS Non-destructive testing Thermal neutron radiographic testing Determination of beam L/D ratio ICS 19.100