Cne~mpa.eb~b~t cocmae u u~tmencue~tocrnb .~lo~u~teettenrnuoeo eee~tenu:t

CBeTa, BO-BTOpbIX, X21g cBeTa JIIOMHHecKeHIIH}L OXHHaNOBbIfI COCTaB JIIOMIIHeC- IieItgllI/I HeaKcnOHOBai~I~oro ~i aNCUOHOBaHHoro o6pasga 06~cHgeTCfl TeM, qTO c e p e 6 p s s s s l e Nanssi He o6aaxaDT ceaeNT~SHofi aScop6aHefi S B.gHMOfi UaCTS cnewrpa. 0 6 p a 3 o s a n , e cKpsIroro ~oTorpa~DnqecHoro H 3 o 6 p a ~ e s , ~ 3am,~C~iT aT TeMnepaTypb~ [7], ~TO COOTBeTCTByeT uamlCM xaKgNM 3aB~C~MOCTI~ ~ . T e S - CFIBHOCTI{ 2IIOMI, IHHCI~eHIII411 OT TeMnepaTypsI npl~ npegBapgTenbgOM ocsemeHnm

]/I3MeHeHHe IIHTeI~c!/IBItOCTI4 MaNC~IMyMa B KpaeHOf~ HaeT~{ cneKTpa Ha;( B~I41~HHeM n p e ] I B a p n T e ~ b H o r o o c B e m e u g ~ O~%I=ICHI4TB He y ~ a a o c b , r a ~ NaN MBI p a c ~ o J i a r a z i g He gOCTaTOqHO TOqI4OfI a r m a p a T y p o f L EcJII~ CqI4TaTb, tITO 0TO cBegeuHe oSycaoB~e~o upnMeC~Mg [I, 2], TO TOr~a ~IHTelICFIBHOCTB IIpll NO- pOTN~X 3~C~03~U~X 5~Ina 5~i nOCTO~S~Ofi. Ha oc~oBann~ pa60T [3, 4], ~o- Topple r~p~H~cy~OT c B e ~ e ~ e I~36S~T~;y cepe6pa ~ HeoupeAe~e~of~ nox<a q~opMe, }IHTeHOI4BHOCTI~ MaNCH~'~yMa ~ I<pacHOii qacT~ x o a ~ a y~e.~n~Baa'~c,~.

B oSo~x cayqaHx aTO o3Ha~aao 6M - - oFpaHI~IFITBO~ I{0p0THHM!5 3HOIlO3glIH- gMYI, I<OTOpBIM~ BepofITHO, oTBe~laeT llOqep~ieHi~e B llO;~3NCllO3~IKldOIIHOfI qaeTH ~;pgBof~ no,~epHeHgfL B ~am~,~x on~ITax ~ N c n o s g ~ t ~ 65IJJ~4 ~I,0BOJII, H0 J t ~ H H s I e , TaN qTO c n m i ; e H ~ e ItItTettcI~IBHOCTI/I ~;pac~oro MaNeIIMyMa 5lO~I-IO 06%~ICItIITt~

0TO e o o 6 i ~ e H n e g~J i~eTe~ pe3y:IBTaTOM ArmXOM~OfI pa6oTSI, ~ smoJ IHennof i noA py~;ozOXCTBOM Itpoqpeccopa 3 a x o ~ a a a s q)gai~qeCNOM ~IgCYnTyTe Hap~oBa NnuBepcr~Teya.

I I o c T y n ~ o 3. 12. 1956.

S P E C T R A L C O M P O S I T I O N A N D I N T E N S I T Y O F L U M I N E S C E N T

R A D I A T I O N OF A P H O T O G R A P H I C E M U L S I O N

(Abstract of p reced ing paper)

0LGA NOVJ~KOVX Phys ica l Ins t i tu te , Charles Universi ty, Prague*)

A s tudy is m a d e of the spectral compos i t ion of luminescen t r ad ia t ion of var ious photo- graphic mater ia l s and of the effect of pre-exposure and pressure on the spectra l composi - t ion and in t ens i ty of luminescent rad ia t ion . The spectral compos i t ion of luminescent r ad ia t ion was de te rmined spectrographical ly . The decrease in i n t ens i t y of the luminescen t rad ia t ion was de te rmined re la t ive ly on the basis of the charac ter i s t ic curve of the p la te used for recording (Fig. 1).

The spectra l compos i t ion of luminescen t r ad ia t ion was de te rmined for f ive nega t ive and three pos i t ive pho tograph ic mater ia ls . I n the luminescen t spec t rum of nega t ive pho tograph ic mater ia l s two m a x i m a were found -- in the green par t of t he spec t rum in t he region ,t = 536 -- 559 m# according to the t y p e of emuls ion used, and in the red par t of the spec t rum Z 625 -- 615 m/~. W i t h pos i t ive s i lver chloride emulsions only one maxi - m u m 2 - - 485 m/~ was found.

Pre-exposure, to which there corresponds a dens i ty grea ter t h a n 2.5 and di rec t v is ib le blackening, ca~t~es a decrease in in t ens i ty of the f luorescent r ad ia t ion of the pho tograph ic f i lm. This decrease takes place t h roughou t the spec t rum (Fig. 2). The m a g n i t u d e of t he decrease in i n t ens i t y is dependen t on the t empe ra tu r e dur ing the pre-exposure of the specimens. The decrease in i n t ens i t y grows wi th the per iod of i l l umina t ion for otherwise cons t an t condi t ions of i l l umina t ion (Fig. 3).

S ta t ic pressure (500--3,000 kg /cm ~) and impac t pressure (falling weigh t of 4.5 kg f rom a he igh t of 20--100 era) also causes a decrease in i n t ens i t y of the luminescence wi thou t change in the spectra l composi t ion . (Fig. 4).

B a t h p h e n o m e n a were qua l i t a t i ve ly ver i f ied on all f ive nega t ive pho tograph ic mate - rials and dep-3nd q u a n t i t a t i v e l y on the k ind of emulsion. I t was found by m e a s u r e m e n t

*) Now at l~eseareh I n s t i t u t e for E lee t ro techn ica l Physics , Prague.

Czechos]. Journ. Phys. 7 (1957) 479

Otgct Novdlcovd: Cne~mpaJtbuslg cocmae u uumettcueuocmb ~o$tuuecueum1~ozo ceeueuun

tha t pressure and i l lumination do not mutual ly cancel each other. The decrease obtained by pressure-exposure and expostLre-pressure is greater than the decrease caused by pres- sure or pre-exposure individually.

I n conclusion the paper at tempts to explain the influence of pre-exposure on the inten- s i ty of hunineseent radiation.

Received 3. 12. 1956.

r - - Re]erence8

[1] FoJJy6 C. I/I.: Vcnex~ ~ay~H0~ ~oTorpa~}~ I. H3~aTea~cTBo AH CCCP, Moc~Ba, 1951.

[2] I/IsB. AH CCCP, cep. X~M. 1 (1952), 202. [3] F a r n e t l G., B u r t o n P., K a l l a m a 1%.: Phil. Mag. 41 (1950), 157. [4] F a r n e ] l G., B u r t o n P., H a l l a m a R.: Phil. Mag. 41 (1950), 545. [5] M e i d i n g e r W." Phys. Zs, ~1 (1940), 277. [6] F r i e d m a n n O . , H o r o w i t z B.: P h o t . Sci. T e c h n . 2 (1955) , 42. [7] B e r g W.: Trans. Farad. Soc. 35 (1939), 445.

480 tIexoc~, qbH3. ~KypH. 7 (1957)