¾M OSL Þ Ã Å Æ W d l X ¢ ºM S z »8 ý LM-OSL V R Ë Ä Z Ø Ä Z ØV Ä

(1)

¾M OSL Þ Ã Å Æ W d l X ¢ ºM S z »8 ý LM-OSL V R Ë Ä Z Ø Ä Z ØV Ä

»g ` @ ¸ ^∗ · ý ¡ ÷ 7 B

/ B

N Å Ò@ / < Æ § Ó ü t o < Æõ , / B N Å Ò 314-701

"

k¹ ÿ x

/ B

N Å Ò@ / < Æ § t | 9 ¨ 8 â õ < Æõ , / B N Å Ò 314-701 (2005¸ 5 Z 4 12{ 9 ~ Ã Î6 £ §)

íl ñ K SARD ~ ½ ÓZ O Ü ¼ Ð @ /8 £ ¤& ñ s Ô ¦ 0 p xÙ þ ¡~ 4 x o Ðl \ F g " é ¶ _ [ jl \ ¦ + þ A& h Ü

¼ Ð 7 £ x r v H l Õ ü t (LMT)` ¦ & h 6 x # LM-OSL ñ\ ¦ % 3 % 3 . LM-OSL ñ\ ¦ / B G & h ½ + Ë # 6 > h $ í ì r Ü ¼ Ð ì r K % i . 6> h_ $ í ì r ñ × æ fast, medium $ í ì r \ " f ¸ | ¾ Ó\ É r ñ_ [ jl

+ þ A$ í ` ¦ Ð% i .

PACS numbers: 61.82.M

Keywords: SARD ~ ½ ÓZ O , LM-OSL, $ í ì r ñ, + þ A$ í

I. " e Â ] Ø

@& h Ó ü t s ¦ ¦ < Æ Ä »Ó ü t \ " f Æ ÒØ ¦ ô Ç $ 3 % ò (Quartz)s

© $ 3 (Feldspar) É r & ñ ? /\ < Ês > r F ô Ç . s

Ð K { ç ß (band gap) s \ W = (trap)õ F ½ + Ë × æ d

(recombination center)s + þ A$ í ÷ & ¦ o $ í ~ ½ Ó \ _

K W = \ H , F ½ + Ë × æd \ H ª / B N (hole) s í S \

) a . s M : # l F g " é ¶` ¦ ~ Ã ÎÜ ¼ ª / B N õ F ½ + Ë

H X < s õ & ñ \ " f ~ ½ ÓØ ¦ ÷ & H y n Cs OSL (optically stim- ulated luminescence) s .

OSL` ¦ 8 £ ¤& ñ H ~ ½ ÓZ O É r CW-OSL (continuous wave O SL) õ LM-OSL (linearly modulated OSL)s e . CW- OSL É r r ç ß \ ñ_ [ jl y è H Ô æ õ / B G (decay curve) + þ AI X < Bailey H s כ s [ j > h_ $ í ì r s

× æ^ o ? ) a ñe ` ¦ µ 1 ß) Í Ç x ¦, © @ /& h F g < Æ& h ~ ½ ÓØ ¦Ö ¦ (detrapping rate) õ $ í © / B G (growth curve)_ : £ ¤$ í \

fast, medium, slow$ í ì r Ü ¼ Ð " î " î Ù þ ¡ [1]. LM-OSL

É r 0 \ " f þ j@ /° ú כ t 7 £ x W = s q 0 >f \

ñ y è H 4 x Ä ºo ¸ ª _ / B G Ü ¼ Ð, " f Ð É r W =

\

l ô Ç r ç ß _ s \ ¦ ¿ º ¦ H # Q $ í ì r

ñ (component signal)_ × æ^ o ?s . ½ ¨\ _ $ í ì r _

Ã º H 3 > h [2], 4> h [3], 5> h [4], 6> h [5] Ð { 9 Ã ºî r1 l x

< Æ (first-order kinetics) $ í ì r ñ[ þ t Ð · ú 9& . 6 £ § d

∗

E-mail: [email protected]

(1) É r { 9 Ã ºî r1 l x < Æ $ í ì r` ¦ · p .

L(t) = n

0

αI

0

P t exp(− αI

0

t

²

2P ) (1) t

max

=

r P αI

₀

L

max

= n

0

P αI

₀

√ 1

e = n

0

t

_max

1 v

#

l " f n

⁰

H W = _ Ã º (trap population), α H F g s : r o é ß

& h (photoionisation cross-section), I

₀

H F GF g " é ¶ _ þ j

@

/y © ¸ (maximum stimulation light intensity), P H 8 ú x 8 £ ¤

&

ñ r ç ß (total observation time)s . t

^max

H 4 x Ä ºo

H r ç ß Ü ¼ Ð" f F g s : r o é ß & h \ % i q Y Vô Ç . 7 £ ¤,

$ H 4 x Ä ºo { 9 Ã º2 ¤ F g s : r o é ß & h s & " f ~ 1

>

q 0 >t H W = õ ' aº e . L

^max

H 4 x Ä ºo _ þ j@ /° ú כ s

. LM-OSL ñ\ " f ± p · ú ¡\ H ¶ ð7 á ¤ ô Ç 4 x Ä º o

H z ´ : r \ " f 5 í & ñ ¸ë ß y n C\ ¸Ø ¦ ÷ &# Q ¸ _ ] j ÷ &

H Â Òì r Ü ¼ Ð CW-OSL @ /8 £ ¤& ñ \ s 6 x ) a [6].

SARD (single aliquot regenerative dose) ~ ½ ÓZ O É r 2000

¸

Murray, Wintle\ _ K > hµ 1 Ï ) a CW-OSL @ /8 £ ¤& ñ _ ô

Ç ~ ½ ÓZ O Ü ¼ Ð @& h 8 £ x s ¦ ¦ < Æ Ä »Ó ü t _ @ /8 £ ¤& ñ \ V , o

s 6 x ÷ & ¦ e [7]. Õ ª Q LM-OSL ½ ¨\ " f y $ í ì r [

þ

t _ Ó ü t o & h : £ ¤$ í s µ 1 ß) t " f fast $ í ì r s © @ /& h Ü ¼ Ð

ô Ç r « Ñ [8] OSLs ¸ H õ & ñ \ " f medium $ í ì r Ü ¼

Ð 4 ¤ ½ ¨ (recuperation)÷ & H r « Ñ [9]\ @ /K " f H SARD

~

½ ÓZ O s & h ] X t · ú § H ½ ¨ õ e [10].

: r ½ ¨\ " f H OSL íl ñ -Á º SARD~ ½ ÓZ O Ü

¼ Ð @ /8 £ ¤& ñ s Ô ¦ 0 p xÙ þ ¡~ 4 x o Ðl \ LMT (line-

-233-

(2)

arly modulated technique)\ ¦ & h 6 x # OSL ñ\ ¦ % 3

%

3 ¦ d (1)` ¦ s 6 x, / B G & h ½ + Ë (curve fitting) # $ í ì r

ñ (component signal) Ð ì r K % i Ü ¼ 9 ¸ | ¾ Ó (irradiati- on dose) @ /q y $ í ì r ñ_ + þ A$ í (linearity)` ¦ · ú

Ð ¤ .

II. ÷ m Ç] M ö õ m Í + s ÇÊ Ý

1. S z » õ m Í ÷ m Ç] M öX ê sR

"

f ;ç H 4 x o ¦5 Å q ¸ Ð / B N & ³ © \ " f µ 1 ÏÏ ã J ) a Ðl

¸y \ " f Flemings ] jî ß ô Ç ~ ½ ÓZ O \ $ 3 % ò ` ¦ ì r o

% i ¦ [11] & h ü @ Ü ¼ Ð F G # © $ 3 s [ O s t · ú § É r í

H Ã ºô Ç $ 3 % ò e ` ¦ S X % i [12]. Ö ¦ Q ñ_ : £ ¤$ í q

§\ ¦ 0 A # z í ß l ü < [13]_ $ 3 % ò s s 6 x ÷ &% 3 . ¸

H 8 £ ¤& ñ \ H Riso TL/OSL © q (TL/OSL-DA-15)\ ¦ s 6

x % i . © Ã Ì ) a © u H r « Ñ\ þ j@ / 50 mW/cm

²

' õ A Ò

o y n C` ¦ ¸ H LED (λ470 ± 30 nm), F g 7 £ x C ' a (EMI9235), F GF g " é ¶ õ Í tF g` ¦ ì r o [14] H F g < Æ 9 ' (U340,SchottGG-420), β " é ¶ (

⁹⁰

Sr 0.09Gy/s), + þ A\ P (0.1 - 30

^◦

C/s) s 0 p x ô Ç ½ + ËF K\ P 1 p x s .

2. CW-OSL Þ Ã Å Æ R w

Murray ü < Wintles ¦î ß ô Ç sequence (Table 1)\ ¦ z í ß l

ü <ü < 4 x o Ðl \ & h 6 x # Fig. 1õ ° ú s OSL

ñ (Ô æ õ / B G )\ ¦ % 3 % 3 . 3.6Gy ~ ½ Ó ¸ Ê ê 8 £ ¤& ñ ) a OSL \ " f z í ß l ü < (Nam) H íl ° ú כs 7,391 (counts;s Ê

ê cts Ð ³ ðl )% i ¦ 4 x o Ðl (Bong) H 54 (cts) Ð B Ä

º ¤ . 1 p x | ¾ Ó (equivalent dose) É r Fig. 2 ü < ° ú s

$ í

© / B G Ü ¼ ÐÂ Ò' & ñ ) a . Ô æ õ ñ íl ° ú כs B Ä º

É

r 4 x o Ðl H ¸ # 3 0 A -Á º & " f 1 p x | ¾ Ó` ¦ & ñ

½

+ É Ã º \ O % 3 . s ü < ° ú s 4 x o Ðl % ! 3 ñ_ [ jl

½ + É â Ä º\ H + þ A$ í s S X Ð÷ &t · ú § @ /8 £ ¤& ñ s

# Q§ > .

Fig. 1. CW-OSL decay curves. These are OSL intensities corresponding to 3.6Gy, respectively. In spite of the same dose, the initial first value(0.16s) is 7,391(cts) for a roof tile from Nam and 54(cts) for a pottery from Bong.

Table 1. Generalised single-aliquot regeneration se- quence

Step Treatment

Load samples on Riso 1. Load samples

TL/OSL reader

2. Preheat Preheat to 220

^◦

C for 10s 3. OSL measurement Stimulate for 40s at 125

^◦

C : Lx

^a

4. Test dose Give test dose for 16s

5. Cutting-heat Heat to 160

^◦

C

6. OSL measurement Stimulate for 40s at 125

^◦

C : Tx

^b

Give dose,

7. Dose

D

^ci

= 40s, 80s, 120s, 0s, 40s 8. Repeat step2-7 Return to step2

a,b

Lx and Tx are the integrated OSL signal for initial 0.8s with background subtracted.

c

D

i

are carried out one at a time for repeated step2-7.

3. LM-OSL Þ Ã Å Æ R w

z

í ß l ü <ü < 4 x o Ðl \ ¦ @ / © Ü ¼ Ð LM-OSL` ¦ 8 £ ¤

&

ñ # Fig. 3\ Í Ç x . 650

^◦

C t \ P # íl o r

6 £ § 9Gy _ β ` ¦ ¸ ¦ 160

^◦

C \ " f \ P % o

# 3600 í 1 l x î ß ñ\ ¦ 8 £ ¤& ñ % i . SARD~ ½ ÓZ O Ü ¼ Ð

@ /8 £ ¤& ñ (1 p x | ¾ Ó 8 £ ¤& ñ )s ¸ ú ÷ &% 3 ~ z í ß l ü < H Fig.

3(a) \ " f fast$ í ì r s slow$ í ì r \ q K © { © y Ä º[ j .

Õ

ª Q SARD~ ½ ÓZ O s Ô ¦ 0 p x ô Ç 4 x o Ðl H íl ñ y

¸ B Ä º ± ú . ¢ ¸ô Ç Fig. 3(b)\ " f ^ & h Ü ¼ Ð 4 x o

Ðl z í ß l ü <\ q K ñ y ¸ ± ú .

4. ¤ Ò ÅX ì Ä¶ ¥; c 8 ý X ¢ LM-OSL8 ý V R Ë Ä Z ØÞ Ã Å Æ Ä Z ØP

4 x o Ðl ñ\ ¦ íl or v l 0 A # 5

^◦

C/s _ q Ö

¦ Ð © : r \ " f 650

^◦

C t \ P % i ¦ ~ ½ Ó ¸ | ¾ Ó` ¦

Fig. 2. Regenerated growth curves of a roof tile from

Nam and a pottery from Bong. (a) This 90.41(s) could

be accounted as a equivalent dose of the tile. (b) This

116.30 (Gy) could not be accounted as a equivalent dose

of the pottery due to big errors. A large open ellipse in

(b) represents the size of the error.

(3)

7 £

x r v " f LM-OSL ñ\ ¦ 8 £ ¤& ñ % i . { 9 º _ õ & ñ

É r Table 2 ü < ° ú

LM-OSL É r # l F g " é ¶ _ [ jl \ ¦ + þ A& h Ü ¼ Ð 7 £ x (0 ∼ 50 mW/cm

²

) r v " f 8 £ ¤& ñ ô Ç ñ Ð" f # Q > h_ $ í ì r

ñ × æ^ o ? ) a כ s . Buler H 4 > h_ $ í ì r ñ\ ¦ & ñ Ù þ

¡ ¦ [3] ^ Ã º É r F K y © ¸A \ " f G 2 [ô Ç $ 3 % ò _ ½ ¨\

"

f 6> h_ $ í ì r ñ (fast, medium, 4> h slow)\ ¦ × æ^ o ?r (

`

¦ M : ª ñô Ç & h ½ + Ë õ \ ¦ % 3 % 3 [5].

6 £ § d (2) H W = Ü ¼ Ð r ¸ ú y t · ú § H { 9 Ã

ºî r1 l x < Æ_ LM-OSL ñ [ jl s [15].

L(t) = X

i

α

i

I

0

P n

0i

t exp( −α

i

I

0

2P t

²

) (2) Mathematica \ " f d (2)\ ¦ & h 6 x # LM-OSL z ´+ « >° ú כ` ¦ /

B G & h ½ + Ë % i . z ´+ « >° ú כ` ¦ 6 > h(i = 1, 2, . . ., 6)_ $ í ì r

ñ[ þ t Ð ì r o % i ` ¦ M : ¸ H / B G & h ½ + Ë_ õ ¸

#

3 0 A 3 %s ? / Ð" f © ª ñÙ þ ¡ . õ \ ¦ Fig. 4 \ Í Ç

x . ñ íl \ H ¶ ð7 á ¤ ô Ç LM-OSL 4 x Ä ºo H

Fig. 3. LM-OSL signals. (a) The data shown here are normalized to the maximum value of LM-OSL signals.

From Bong, the intensity of the initial signal is weaker than the late part of signal. Therefore the dating using the SARD method is unreliable. (b) In a whole, the signal sensitivity of a pottery from Bong is lower than a roof tile from Nam.

Fig. 4. LM-OSL signal is decomposed into 6 component signals by curve fitting. The result is corresponded to 9Gy for pottery from Bong. The thick black part(line) is the experimental data and the dotted white line in the black part is superposition of 6 components. The error between the two lines was 2.36 %.

Table 2. LM-OSL sequence

Step Treatment

Load samples on Riso 1. Load samples

TL/OSL reader 2. Heat Heat to 650

^◦

C for 10s 3. Dose Give dose for 100s 4. Preheat Preheat to 160

^◦

C for 10s 5. LM-OSL measurement Stimulate for 3600s at 160

^◦

C 6. Heat Heat to 650

^◦

C for 10s

Give dose, 7. Dose

D

^a_i

= 200s, 300s, 400s, 500s 8. Repeat step2-7 Return to step2

a

D

i

are carried out one at a time for repeated step2-7

CW-OSLÔ æ õ / B G \ " f @ /8 £ ¤& ñ \ 6 x ÷ & 9 ~ 1 > q 0 >

t

H (easy-to-bleach) $ í ì r s [16]. Table 3 É r y $ í ì r

ñ ñ t 5 Å q ÷ & H r ç ß \ @ / # ñ[ jl \ ¦ & h ì

r ô Ç ° ú כs . < >î ß _ Õ ü w H ^ ñ\ @ /ô Ç y $ í ì r

ñ[ þ t _ Ñ þ ì rÖ ¦ l # ¸s . ¸ | ¾ Ós 7 £ x ½ + ÉÃ º2 ¤ s6$ í ì

r _ l # ¸ H y èÙ þ ¡ ¦ Qt $ í ì r _ l # ¸ H ¸¿ º 7

£ x Ù þ ¡ .

5. V R Ë Ä Z ØÞ Ã Å Æ8 ý Ò Å] k ùV R Ë º

OSL s @ /8 £ ¤& ñ \ s 6 x ÷ &l 0 AK " f H ñ_ [ jl

+ þ A$ í ` ¦ Ä »t K ô Ç . íl ñ SARD ~ ½ Ó Z O

Ü ¼ Ð @ /8 £ ¤& ñ s Ô ¦ 0 p xÙ þ ¡~ 4 x o Ðl \ @ /K " f

Fig. 5. Growth curves of 6 components in Table 3.

Fast(s1), medium(s2) components show linearity with

increase of dose. But s3, s4, s5 component show sen-

sitization and s6 component shows saturation.

(4)

Table 3. Integrated values of 6 LM-OSL components with signal duration time.

fast medium sum

^a

β-ray

component component slow component

(Experimental error

dose s1(cts) s2(cts) s3(cts) s4(cts) s5(cts) s6(cts) value) (%)

100s 107,458.6 116,381.4 136,199 299,331.1 905,913.5 8,533,460 10,098,744

(9Gy) <1.06> <1.15> <1.34> <2.96> <8.97> <84.50> (10,094,142) 2.36 200s 270,304.5 274,921.3 293,654.6 595,110.7 1,755,125 16,276,746 19,465,861

(18Gy) <1.39> <1.41> <1.51> <3.06> <9.02> <83.62> (19,453,260) 2.00 300s 432,915.3 430,329.6 440,568.2 828,273.9 2,230,206 21,013,193 25,375,486

(27Gy) <1.71> <1.70> <1.74> <3.26> <8.79> <82.81> (22,378,821) 2.00 400s 582,451.8 611,991.9 613,706.7 1,049,150 2,869,796 25,020,140 30,747,236

(36Gy) <1.89> <1.99> <2.00> <3.41> <9.33> <81.37> (30,720,974) 1.75 500s 752,652.4 804,529.3 820,321.5 1516547 4,013,068 28,329,031 36,236,150

(45Gy) <2.08> <2.22> <2.26> <4.19> <11.07> <78.18> (36,201,737) 1.76

a

The sum means the summation of intensity from s1 to s6.

The figures in braket < > express contribution percentages of an each component.

The error were calculated by using

^|Exp−sum|_Exp

× 100.

d

(2)\ ¦ s 6 x # LM-OSL` ¦ / B G & h ½ + Ë % i ¦ 6> h_ $ í ì

r ñ Ð ì r o # y $ í ì r ñ + þ A$ í ` ¦ · ú Ð

¤ . Fig. 5 H Table 3 _ β ¸ | ¾ Ó\ É r $ í ì r ñ

\

¦ Õ ªA á Ô Ð · p כ s . β ¸ | ¾ Ó` ¦ & h & h Ü ¼ Ð 7

£

x r ( ` ¦ M : fast(s1), medium(s2) $ í ì r \ " f + þ A$ í s Ä

»t ÷ &% 3 . s3, s4, s5 $ í ì r É r ì ø Í4 ¤ ÷ & H z ´+ « > õ & ñ \ " f y

s6$ í ì r É r é H y o (de-sensitisation) z ¤ H X < ¸

| ¾ Ó_ 7 £ x Ð # W = s í o÷ &% 3 F ½ + Ë× æd (recombination center) s y èÙ þ ¡l M :ë H{ 9 כ s .

III. + s Ç Â ] Ø

SARD ~ ½ ÓZ O É r Murray ü < Wintle(2000)\ _ K è> h÷ &

#

Q @& h Ó ü t õ Ä »Ó ü t _ @ /8 £ ¤& ñ \ ´ ú §s s 6 x ÷ & ¦ e . Õ ª

Q Ä »Ó ü t \ íl ñ & h OSL_ õ & ñ \ " f medium $ í ì r Ü ¼ Ð 4 ¤ ½ ¨ (recuperation)÷ & H r « Ñ\ @ /K

"

f H SARD ~ ½ ÓZ O s Â Ò& ñ S X H ½ ¨ õ e .

: r ½ ¨ H íl ñ & h # Q SARD ~ ½ ÓZ O Ü ¼ Ð @ /8 £ ¤& ñ s

Ô ¦ 0 p x ô Ç 4 x o Ðl \ LMT\ ¦ & h 6 x # LM-OSL

`

¦ 6 > h_ $ í ì r ñ Ð ì r K % i ¦, ¸ | ¾ Ó` ¦ & h & h Ü ¼

Ð 7 £ x r v " f y $ í ì r ñ\ ¦ Æ Ò& h ô Ç õ fast(s1), medium(s2) $ í ì r \ " f + þ A$ í s Ä »t ÷ &% 3 .

@ /8 £ ¤& ñ É r ~ ½ Ó ¸ ü < OSL ñ s \ + þ A$ í s Ä

»t ÷ &# Q 0 p x . Õ ª X < @ /8 £ ¤& ñ õ & ñ \ " f ì ø Í4 ¤

÷

& H \ P % o , y n C F G, ~ ½ Ó ¸ y ¸\ ¦ or

&

+ þ A$ í ` ¦ Á º -ä ¼o l M :ë H \ s \ @ /ô Ç Ð& ñ (correc- tion) s 9 כ ¹ .

SARD ~ ½ ÓZ O É r fast $ í ì r × æ \ " f ¸ % 6 £ § 1 í s ? /_ B Ä

º & h É r ª Ü ¼ Ð @ /\ ¦ 8 £ ¤& ñ H ~ ½ ÓZ O Ü ¼ Ð f É r $ í ì

r` ¦ s 6 x H ~ ½ ÓZ O É r \ O . Õ ªX O t ë ß · ú ¡Ü ¼ Ð LMT\ ¦ & h 6

x # ñ\ ¦ ì r K ¦ y ¸_ & ñ | ¾ Ó& h ì r$ 3 õ Ð& ñ

@

/8 £ ¤& ñ s 0 p x ½ + É כ s .

P

c p 8 ý ò k >

: r ½ ¨ H õ < Æl Õ ü t Â Ò ² D G t & ñ ½ ¨z ´ \ O Ü ¼ Ð t & ñ

)

a / B N Å Ò@ / < Æ § ë H oF q õ é ß ½ ¨z ´_ F & ñ & h ¸¹ ¡ § Ü

¼ Ð Ã º' ÷ &% 3 _ þ v m .

Y

c p w Ã U Ø ô

[1] R. M. Bailey, B. W. Smith and E. J. Rhodes, Radiat.

Meas. 27, 123 (1997).

[2] C. K. Kuhns, N. Lagersnap and S. W. McKeever, Radiat. Meas. 32, 413 (2000).

[3] E. Buler, L. Botter-Jensen and A. S. Murray, Ra- diat. Meas. 32, 407 (2000).

[4] J. S. Singarayer and R. M. Bailey, Radiat. Meas. 37, 451 (2003).

[5] S. G. Kim, H. S. Kim and S. Y. Hong, SAEMULLI, 47, 368 (2003).

[6] E. Bulur and H. Y. Goksu, Radiat. Meas. 30, 505

(1999).

(5)

[7] A. S. Murray and A. G. Wintle, Radiat. Meas. 32, 57 (2000).

[8] J. H. Choi, A. S. Murray, M. Jain, C. S. Cheong and H. W. Chang, Quat. Sci. Rev. 22, 407 (2003).

[9] M. Jain, A. S. Murray and L. Botter-Jensen, Radiat.

Meas. 37, 441 (2003).

[10] A. S. Murray and A. G. Wintle, Radiat. Meas, 37, 377 (2003).

[11] S. J. Fleming, Archaeometry 12, 133 (1970).

[12] R. B. Galloway, Radiat. Prot. Dosim. 47, 679 (1993).

[13] H. S. Rho, D. Phil. thesis. Kongju National Univer- sity. (2002).

[14] D. G. Hong and R. B. Galloway, Nucl. Instrum.

Meth. B 160, 59 (2000).

[15] N. A. Spooner and D. G. Questiaux, Radiat. Meas.

32, 659 (2000).

[16] L. Botter-Jensen, G. A. T. Duller, A. S. Murray and D. Banerjee, Radiat. Prot. Dosim. 84, 335 (1999).

LM-OSL Component Analysis of Pottery with a Weak Early OSL Signal

Hyun-sik Kim

^∗

and Sayong Hong

Department of Physics, Kongju National University, Kongju 314-701

Man-cheol Suh

Department of Geoenvironmental Science, Kongju National University, Kongju 314-701 (Received 12 May 2005)

Pottery from Bongseonri which could not be dated by single aliquot regenerative dose (SARD) because of a weak early signal, was investigated by using linearly modulated-optically stimulated luminescence (LM-OSL). The LM-OSL signals were decomposed into 6 components by curve fitting.

The fast and the medium components were linear with increasing of irradiation dose.

PACS numbers: 61.82.M

Keywords: SARD, LM-OSL, Components, Linearity

∗

E-mail: [email protected]

¾M OSL Þ Ã Å Æ W d l X ¢  ºM S z »8 ý LM-OSL V R Ë Ä Z Ø Ä Z ØV Ä



¾M  OSL Þ Ã Å Æ W d l X ¢  ºM S z »8 ý LM-OSL V R Ë Ä Z Ø Ä Z ØV Ä

 »g ` @   ¸ ∗ · ý  ¡  ÷ 7 B

/ B

N Å Ò@ / < Æ § Ó ü t o  < Æõ , / B N Å Ò 314-701

"

k¹ ÿ   x

/ B

N Å Ò@ / < Æ § t | 9 ¨ 8  â õ  < Æõ , / B N Å Ò 314-701 (2005¸  5 Z 4 12{ 9  ~ Ã Î6 £ §)



íl    ñ   K  SARD ~ ½ ÓZ O Ü ¼ Ð   @ /8 £ ¤& ñ s  Ô  ¦ 0 p xÙ þ ¡~  4  x  o   Ðl \  F g " é ¶ _  [ jl \  ¦   + þ A& h Ü



 + þ A$ í `  ¦  Ð% i  .

PACS numbers: 61.82.M

Keywords: SARD ~ ½ ÓZ O , LM-OSL, $ í ì  r  ñ,   + þ A$ í

I. " e Â ] Ø

@& h Ó ü t s    ¦ ¦ < Æ Ä »Ó ü t \ " f Æ ÒØ  ¦ ô  Ç $ 3 % ò (Quartz)s 

  © $ 3 (Feldspar) É r   & ñ ? /\        < Ês   > r F ô  Ç . s 



Ð   K  {  ç ß   (band gap)  s \  W = (trap)õ  F   ½ + Ë ×  æ d 

 (recombination center)s  + þ A$ í ÷ & ¦   o $ í ~ ½ Ó   \  _

K  W = \   H    , F   ½ + Ë ×  æd  \   H  ª / B N (hole) s   í S \

 ) a . s M :     # l  F g " é ¶`  ¦ ~ Ã ÎÜ ¼   ª / B N õ  F   ½ + Ë

  H X < s  õ & ñ \ " f ~ ½ ÓØ  ¦ ÷ &  H y n Cs  OSL (optically stim- ulated luminescence) s  .

 ×  æ^ o ? ) a   ñe  `  ¦ µ 1 ß) Í Ç x ¦,  © @ /& h   F g  < Æ& h ~ ½ ÓØ  ¦Ö  ¦ (detrapping rate) õ  $ í  © / B G  (growth curve)_  : £ ¤$ í \ 



  fast, medium, slow$ í ì  r Ü ¼ Ð " î " î Ù þ ¡  [1]. LM-OSL



É r 0 \ " f þ j@ /° ú כ t  7 £ x    W = s  q 0 >f  \      

ñ y   è   H 4  x Ä ºo   ¸ ª _  / B G  Ü ¼ Ð, " f Ð  É r W =

\

 l   ô  Ç r ç ß _  s \  ¦ ¿ º ¦     H #  Q $ í ì  r 

ñ (component signal)_  ×  æ^ o ?s  .   ½ ¨\  _    $ í ì  r _

 Ã º  H 3 > h [2], 4> h [3], 5> h [4], 6> h [5] Ð { 9  Ã ºî  r1 l x



< Æ (first-order kinetics) $ í ì  r  ñ[ þ t  Ð · ú  9&   . 6 £ § d 

E-mail: [email protected]

(1) É r { 9  Ã ºî  r1 l x  < Æ $ í ì  r`  ¦   · p .

L(t) = n

αI

P t exp(− αI

t

2P ) (1) t

=

r P αI

L

= n

P αI

√ 1

e = n

t

1 v

#

l " f n

  H W = _  Ã º (trap population), α  H F g s  : r o é ß 



 & h (photoionisation cross-section), I

  H  F GF g " é ¶ _  þ j

@

/y ©  ¸ (maximum stimulation light intensity), P   H 8 ú x 8 £ ¤

&

ñ r ç ß  (total observation time)s  . t

  H 4  x Ä ºo  

   H r ç ß Ü ¼ Ð" f F g s  : r o é ß   & h \  % i q Y Vô  Ç . 7 £ ¤,



 $      H 4  x Ä ºo { 9 Ã º2  ¤ F g s  : r o é ß   & h s  & " f ~ 1 

>

 q 0 >t   H W = õ   ' aº  e   . L

  H 4  x Ä ºo _  þ j@ /° ú כ s

 . LM-OSL   ñ\ " f  ± p · ú ¡\      H ¶ ð7 á ¤ ô  Ç 4  x Ä º o

  H z ´ : r \ " f 5 í & ñ  ¸ë ß  y n C\   ¸Ø  ¦ ÷ &# Q ¸  _  ] j ÷ &



 H Â Òì  r Ü ¼ Ð CW-OSL   @ /8 £ ¤& ñ \  s 6 x ) a  [6].

SARD (single aliquot regenerative dose) ~ ½ ÓZ O  É r 2000

¸

 Murray, Wintle\  _ K  > hµ 1 Ï  ) a CW-OSL   @ /8 £ ¤& ñ _  ô

 Ç ~ ½ ÓZ O Ü ¼ Ð @& h 8 £ x s    ¦ ¦ < Æ Ä »Ó ü t _    @ /8 £ ¤& ñ \  V ,  o

 s 6 x ÷ & ¦ e    [7]. Õ ª Q  LM-OSL   ½ ¨\ " f y   $ í ì  r [

þ

¾M OSL Þ Ã Å Æ W d l X ¢ ºM S z »8 ý LM-OSL V R Ë Ä Z Ø Ä Z ØV Ä

¾M OSL Þ Ã Å Æ W d l X ¢ ºM S z »8 ý LM-OSL V R Ë Ä Z Ø Ä Z ØV Ä

»g ` @ ¸ ^∗ · ý ¡ ÷ 7 B

N Å Ò@ / < Æ § Ó ü t o < Æõ , / B N Å Ò 314-701

k¹ ÿ x

N Å Ò@ / < Æ § t | 9 ¨ 8 â õ < Æõ , / B N Å Ò 314-701 (2005¸ 5 Z 4 12{ 9 ~ Ã Î6 £ §)

íl ñ K SARD ~ ½ ÓZ O Ü ¼ Ð @ /8 £ ¤& ñ s Ô ¦ 0 p xÙ þ ¡~ 4 x o Ðl \ F g " é ¶ _ [ jl \ ¦ + þ A& h Ü

+ þ A$ í ` ¦ Ð% i .

Keywords: SARD ~ ½ ÓZ O , LM-OSL, $ í ì r ñ, + þ A$ í

@& h Ó ü t s ¦ ¦ < Æ Ä »Ó ü t \ " f Æ ÒØ ¦ ô Ç $ 3 % ò (Quartz)s

© $ 3 (Feldspar) É r & ñ ? /\ < Ês > r F ô Ç . s

Ð K { ç ß (band gap) s \ W = (trap)õ F ½ + Ë × æ d

(recombination center)s + þ A$ í ÷ & ¦ o $ í ~ ½ Ó \ _

K W = \ H , F ½ + Ë × æd \ H ª / B N (hole) s í S \

) a . s M : # l F g " é ¶` ¦ ~ Ã ÎÜ ¼ ª / B N õ F ½ + Ë

H X < s õ & ñ \ " f ~ ½ ÓØ ¦ ÷ & H y n Cs OSL (optically stim- ulated luminescence) s .

× æ^ o ? ) a ñe ` ¦ µ 1 ß) Í Ç x ¦, © @ /& h F g < Æ& h ~ ½ ÓØ ¦Ö ¦ (detrapping rate) õ $ í © / B G (growth curve)_ : £ ¤$ í \

fast, medium, slow$ í ì r Ü ¼ Ð " î " î Ù þ ¡ [1]. LM-OSL

É r 0 \ " f þ j@ /° ú כ t 7 £ x W = s q 0 >f \

ñ y è H 4 x Ä ºo ¸ ª _ / B G Ü ¼ Ð, " f Ð É r W =

l ô Ç r ç ß _ s \ ¦ ¿ º ¦ H # Q $ í ì r

ñ (component signal)_ × æ^ o ?s . ½ ¨\ _ $ í ì r _

Ã º H 3 > h [2], 4> h [3], 5> h [4], 6> h [5] Ð { 9 Ã ºî r1 l x

< Æ (first-order kinetics) $ í ì r ñ[ þ t Ð · ú 9& . 6 £ § d

(1) É r { 9 Ã ºî r1 l x < Æ $ í ì r` ¦ · p .

l " f n

H W = _ Ã º (trap population), α H F g s : r o é ß

& h (photoionisation cross-section), I

H F GF g " é ¶ _ þ j

/y © ¸ (maximum stimulation light intensity), P H 8 ú x 8 £ ¤

ñ r ç ß (total observation time)s . t

H 4 x Ä ºo

H r ç ß Ü ¼ Ð" f F g s : r o é ß & h \ % i q Y Vô Ç . 7 £ ¤,

$ H 4 x Ä ºo { 9 Ã º2 ¤ F g s : r o é ß & h s & " f ~ 1

q 0 >t H W = õ ' aº e . L

H 4 x Ä ºo _ þ j@ /° ú כ s

. LM-OSL ñ\ " f ± p · ú ¡\ H ¶ ð7 á ¤ ô Ç 4 x Ä º o

H z ´ : r \ " f 5 í & ñ ¸ë ß y n C\ ¸Ø ¦ ÷ &# Q ¸ _ ] j ÷ &

H Â Òì r Ü ¼ Ð CW-OSL @ /8 £ ¤& ñ \ s 6 x ) a [6].

SARD (single aliquot regenerative dose) ~ ½ ÓZ O É r 2000

Murray, Wintle\ _ K > hµ 1 Ï ) a CW-OSL @ /8 £ ¤& ñ _ ô

Ç ~ ½ ÓZ O Ü ¼ Ð @& h 8 £ x s ¦ ¦ < Æ Ä »Ó ü t _ @ /8 £ ¤& ñ \ V , o

s 6 x ÷ & ¦ e [7]. Õ ª Q LM-OSL ½ ¨\ " f y $ í ì r [

t _ Ó ü t o & h : £ ¤$ í s µ 1 ß) t " f fast $ í ì r s © @ /& h Ü ¼ Ð

ô Ç r « Ñ [8] OSLs ¸ H õ & ñ \ " f medium $ í ì r Ü ¼

Ð 4 ¤ ½ ¨ (recuperation)÷ & H r « Ñ [9]\ @ /K " f H SARD

½ ÓZ O s & h ] X t · ú § H ½ ¨ õ e [10].

: r ½ ¨\ " f H OSL íl ñ -Á º SARD~ ½ ÓZ O Ü

¼ Ð @ /8 £ ¤& ñ s Ô ¦ 0 p xÙ þ ¡~ 4 x o Ðl \ LMT (line-

arly modulated technique)\ ¦ & h 6 x # OSL ñ\ ¦ % 3

3 ¦ d (1)` ¦ s 6 x, / B G & h ½ + Ë (curve fitting) # $ í ì r

ñ (component signal) Ð ì r K % i Ü ¼ 9 ¸ | ¾ Ó (irradiati- on dose) @ /q y $ í ì r ñ_ + þ A$ í (linearity)` ¦ · ú

Ð ¤ .

1. S z » õ m Í ÷ m Ç] M öX ê sR

f ;ç H 4 x o ¦5 Å q ¸ Ð / B N & ³ © \ " f µ 1 ÏÏ ã J ) a Ðl

¸y \ " f Flemings ] jî ß ô Ç ~ ½ ÓZ O \ $ 3 % ò ` ¦ ì r o

% i ¦ [11] & h ü @ Ü ¼ Ð F G # © $ 3 s [ O s t · ú § É r í

H Ã ºô Ç $ 3 % ò e ` ¦ S X % i [12]. Ö ¦ Q ñ_ : £ ¤$ í q

§\ ¦ 0 A # z í ß l ü < [13]_ $ 3 % ò s s 6 x ÷ &% 3 . ¸

H 8 £ ¤& ñ \ H Riso TL/OSL © q (TL/OSL-DA-15)\ ¦ s 6

x % i . © Ã Ì ) a © u H r « Ñ\ þ j@ / 50 mW/cm

' õ A Ò

o y n C` ¦ ¸ H LED (λ470 ± 30 nm), F g 7 £ x C ' a (EMI9235), F GF g " é ¶ õ Í tF g` ¦ ì r o [14] H F g < Æ 9 ' (U340,SchottGG-420), β " é ¶ (

Sr 0.09Gy/s), + þ A\ P (0.1 - 30

C/s) s 0 p x ô Ç ½ + ËF K\ P 1 p x s .

2. CW-OSL Þ Ã Å Æ R w

Murray ü < Wintles ¦î ß ô Ç sequence (Table 1)\ ¦ z í ß l

ü <ü < 4 x o Ðl \ & h 6 x # Fig. 1õ ° ú s OSL

ñ (Ô æ õ / B G )\ ¦ % 3 % 3 . 3.6Gy ~ ½ Ó ¸ Ê ê 8 £ ¤& ñ ) a OSL \ " f z í ß l ü < (Nam) H íl ° ú כs 7,391 (counts;s Ê

ê cts Ð ³ ðl )% i ¦ 4 x o Ðl (Bong) H 54 (cts) Ð B Ä

º ¤ . 1 p x | ¾ Ó (equivalent dose) É r Fig. 2 ü < ° ú s

© / B G Ü ¼ ÐÂ Ò' & ñ ) a . Ô æ õ ñ íl ° ú כs B Ä º

É

r 4 x o Ðl H ¸ # 3 0 A -Á º & " f 1 p x | ¾ Ó` ¦ & ñ

+ É Ã º \ O % 3 . s ü < ° ú s 4 x o Ðl % ! 3 ñ_ [ jl

½ + É â Ä º\ H + þ A$ í s S X Ð÷ &t · ú § @ /8 £ ¤& ñ s

# Q§ > .