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(1)

! :

" # x

:

$%&

!

"# !$%

%

&

' (%

)*

+ *

, -

&

. /0 .

* ,2

3 45 67 %

89 :

;

" + ,

<- ) = #

) ' ?!%

(

% .

A B 4B

&

C ,

67 % 8 :

D & =4 " + 89 : 67 % 3 45 )

67 % E%2 9

&

; C

(F

;

&

3 % G

' ?!%

C .

Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Dr. H. Pourghassem, 2

(2)

Department of Electrical Engineering, Najafanad Branch, Islamic Azad University, Dr. H. Pourghassem, 3

!

" # x

H

; )*

, -

! x 4

J $- K4 C

=$

:

1 - 4B

Coherent scattering

2 - H )* =KO = Photoelectric effect

3 - , =Q4

Compton scattering

4 - O - C$:

Pair production

* E% - RS:

%

? / 'S

%

* E% -

% TU V* %

* -

% .

1 -

$%&

) $*

,2

=

* B ; ,

W B 6 <- X Y

Z F - [D CE:

%2 . * 4B B <-

3 %

, -

/*

: .

, -

)*

, =KO

$

; C

O

/*

4- 6 E% =KO )*

-

; C

% .

*

; Y 4U

!

\K*

6

% 4%

7 %

6 . = J $- FC CO , =KO / 30 -15 \K* !

! 67 %

6 B , =KO )*

-

; E%2

%

X !

\%

; , % 2

. X Y )*

F /*

,

K* =KO Z

Y < =KO , -

F 8 - 67 %

; '

5 . - 6 B , =KO 4-, %

, =KO -

% -

* 67 % K 67 % 8 - 8=

5 =%

,2

8=%

)*

, - 67 % 8

" E:

_/=`

C .

(3)

1 -

$%&

) $*

Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Dr. H. Pourghassem, 5

Department of Electrical Engineering, Najafanad Branch, Islamic Azad University, Dr. H. Pourghassem, 6

2 - ,

- .

)*

, - 67 % 4

=8

&

67 % A= 94B )*

, =KO

#

* k K*

&

6 E% =KO

*

; TU

Z ; ,2 , =KO .

, =KO

&2

67 %

% - ,2

; F

C

K% a )*

+

"

+ $%

4 F b*

RS:

. -

)*

, =KO

*#

V % k )*

, =KO

&

*#

6 ,2

D= O - x ! , - " 67 % 6 D * 5 : * H

* F !

! 0 =;

* .

*

* H

= )* =KO

* .

X 4=

3

* )* =KO =

, - 67 %

, -

? KU

\ , -

U 4-

? D=

.

3

1 ~

( ) Photoelectric effect energy

(Atomic number) ~3 Photoelectric effect

(4)

2 - ,

- .

* )* =KO = 4-

67 % , - 8 -

% =KO

&

- Z ;

D=

.

6 : O ; , =KO /

% =KO

&

* *#

67 % A=

=4

B ; % 6B *#& B , =KO X D=% & 0 % =KO 8 2)* * . 6 B *#

% -

*

*2 .

Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Dr. H. Pourghassem, 7

2 - ,

- .

a X 4=

H )* =KO =

c* V 67 % , - cB * .

* d= ; X 4= ' )* U B 6 . : * V %

H

)* =KO =

67 % , - : .

(5)

2 - ,

- .

H )* =KO = A B

B , - 67 %

- 6

U - 4

*#

FC

; eO G R (

; , =Q4

=8 - B ,

* 4- U 6 `8-\K* ! ( *7 %

F %

; eO G C .

Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Dr. H. Pourghassem, 9

Department of Electrical Engineering, Najafanad Branch, Islamic Azad University, Dr. H. Pourghassem, 10

&

,

- .

/0

&

9 : , -

H )* =KO =

6

* -

67 O * .

9 : R ; ,2

* C H )* =KO = TU

9E C $ -

*

. =K - 5* )* =KO = H K * X : C O * -C $ 9E 4%

. K * : - K * D 6 B ! )* =KO =

U 4- , -

C9 % D=

.

* 6 E=

0 U F_/=`

H

= )* =KO

TU . * -C = 9E

9 :

* H

* C TU c* V c -

! x 4 .

(6)

67 O * C

%

# 4!

4-

6 B -

&

3 % , =Q4 C .

, =Q4 - ( 67 %

30! eO G ; FCO , =KO /

\K*

C .

)*

, - 8 - 67 %

# *

) ; : ; *#& &2, =KO

&

. Z ; .

, - /

, =KO ' (

CE:

6 * :

, U

!

=K 67 %

=4 C

. X ) f 6

9 (

<-

X Y Z )*

, -

=K

" 9U C

&

Department of Electrical Engineering, Najafanad Branch, Islamic Azad University, Dr. H. Pourghassem, 11

3 -

$%&

2 3*&

)

$%&

5 6 7 8 9 : (

) (

0.024(1 cos )

λ θ

∆ = −

θ

3 -

$%&

2 3*&

)

$%&

5 6 7 8 9 : (

c* V 67 %

, - F 8 -

6 B , - , =KO

B

=8 C4 g4U *

C c

% . 4B F O

* B , -

6 B& K 2 6 =8 X 4=

!

\K*

6 B = * -

6 .

(7)

Department of Electrical Engineering, Najafanad Branch, Islamic Azad University, Dr. H. Pourghassem, 13

3 -

$%&

2 3*&

, V 67 % cB

= * H

; V %

"

*&

C

*2 :

6 B !

=K 6 / TU O2

* V* %

* -

.

* B , 8% . ; =8 F =4 ' (% * & = K8

K% a

67 % , -

=K

*&

C .

0

12.4 ( ) Kv= ∆λ A

$

< 9

= 7

!

0 3 B )*

&

6 B ; FR2

, `=

=, 8% CO , =KO / 100 -20 67 % ( * *

B .

C F % F a /hU B

&

5%2 A4B

6 U 4-

* B

=

6 = 9* D-

% i%2 4%

j R2 C B 8 .

Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Dr. H. Pourghassem, 14

(8)

Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Dr. H. Pourghassem, 15

4 -

$

?@A

* 3 %

; 67 O *

`8- J $-

= 4%

.

$ :?@A )*

, - 67 %

*&

C(- Hk- 6 %

= B F - c*7 %

"

+

* 9-

; V %

* % .

K*

&

*

F +. K , =KO 8 : 6 +, =*& 6 A* O 4! , =KO O - C$:

E -

% &

l B 67 %

!

\K*

c

&

A ½

, =KO CO .

B C D

'S B , -

&

)*

= -

!

\K*

A B 9U

&

C/U RS:

F

O

= K , B , - 5*

_ !h-

% .

, - 6 B F67 % H )* =KO = H

eO G 6 B *2

_ !h- C

% C .

A B )*

, - 67 %

# )*

R+ : U 4-

* ) fd C % (

;

F , =Q4

eO G C .

X 4=

; /*

6 B 6 * - K V

* FC 6 Y 10

%

&

B ; 5

%

&

B ;

*

$

; n =;

B .

(9)

Department of Electrical Engineering, Najafanad Branch, Islamic Azad University, Dr. H. Pourghassem, 17

E F B G

e* o _ !h- 6 !

&

C 4

! _ !h- [ -

= `o

!

&

R+ : C

. 67 O *

`8- [D

e* o cB

?;

: . = B E

E F B C 8!

* e* o )*

6 & % 4

&

_ !h-

! B

=%

=

&

R+ :! = `o p=% _ !h- , V V e* o * . C

&

C , .

* e* o q=`

" !8!8- )-

67 % 67 %

=

!

3 % . A= R+ :

c* V 67 % e:

cB

!- 6 B -

! C x _ !h-

% _ !h - A% *& ? . ?; _ !h-e* ocB ,2 b9-

!

C x :

!-N , - F6 9U

!- , - F O e* o _ !h-

?;

C `ox

R+ : .

0

N=N eµx

N0

µ

µ

E F B G

8!

e* o _ !h-

?;

&

3 45 )- )- e* o _ !h-

?;

3 % B ;

9 ( .

Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Dr. H. Pourghassem, 18

Pair Compton ric

Photoelect

Rayleigh µ µ µ

µ

µ= + + +

(10)

Department of Electrical Engineering, Najafanad Branch, Islamic Azad University, Dr. H. Pourghassem, 19

E F B C

# A

* e* o

&

g* Y D- e* o _ !h-

?;

= % * Aa O )

( 6 ,2 C ( ) 0 =; C fU 6 *2 C

FR+ :

=%

= b ) ( C .

e* o _ !h- FR2 r*

R2 ` , K*

C O e* o _ !h- :

E%2 . E%2" $= O Aa O C " $= / ;

ρ

µ ρ/

2

g cm ]

)[

( ] )[

] ( [ )

( 3

1 2

cm g g cm

cm ρ

ρ µ µ

=

*#

% RS:

% A% 4B

= * 4 % 4U

* _ !h-

! V %

x

*#

) C `o (

% RS:

)

Half-value layer

(

* .

!*

= `o

&

R+ :

"

! _ % , V

O B

c R2 =% c* &2

x

! = _ !h- & % * D . B O !

* 4%

. B ; C

:

0

N=N eµx

(1) 1000

800 1000 e e

µ µ

= × = 0.693 0.693

0.22 , 3.15

HVL 0.22 cm

µ µ

= = = =

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