Photometric measurements of thin tracks in nuclear emulsion

Katz, Robert

doi:10.1016/0029-554x(79)90057-0

Cited by 4 publications

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References 7 publications

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“…Except for microdensitometric measurements of the blackness of nuclear emulsions as a function of transverse distance from the ion's path, (15,(19)(20)(21)(22) there is no possibility for direct measurement of the radial-dose distribution in solids or liquids. This group used essentially the same equipment for all its measurements.…”

Section: Particle Tracks In Emulsionsmentioning

confidence: 99%

Radial Distribution of Dose

Katz

Varma

1991

Physical and Chemical Mechanisms in Molecular Radiation Biology

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The radial distribution of dose about the path of a heavy ion, principally from delta rays, is one of the central contributions of atomic physics to the systematization of high LET radiation effects in condensed matter, whether the detection arises in chemical, physical, or biological systems. In addition to the radial distribution of dose, we require knowledge of the response of the system to X-rays or gamma-rays or to beams of energetic electrons such that the electron slowing-down spectra from these radiations can approximate the slowing-down spectra from delta rays even at different radial distances from the ion's path. A combination of these data enables us to calculate the action cross sections for heavy ion bombardments in all detectors for which this information is available. These cross sections are indispensable for the evaluation of effects caused by high LET radiations. In this paper we focus attention principally on the calculation and measurement of the radial distribution of dose and on their limitations.

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Section: Particle Tracks In Emulsionsmentioning

confidence: 99%

Radial Distribution of Dose

Katz

Varma

1991

Physical and Chemical Mechanisms in Molecular Radiation Biology

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Radiobiological Modeling Based On Track Structure

Katz¹

1988

Quantitative Mathematical Models in Radiation Biology

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R a d i o b i o l o g i c a l M o d e l i n g B a s e d On T r a c k S t r u c t u r eR o b e r t K a t z U n i v e r s i t y o f N e b r a s k a , L i n c o l n NE 6 8 5 8 8 -0 1 1 1 USA ABSTRACT S i n c e t h e i n t e r a c t i o n o f b e a m s o f c h a r g e d p a r t i c l e s w i t h t a r g e t s i n p h y s i c s i s c u s t o m a r i l y b a s e d o n beam f l u e n c e a n d i n t e r a c t i o n c r o s s s e c t i o n we h a v e c h o s e n t h e s a m e l o g i c a l s t r u c t u r F o r t h i s m o d e l we r e q u i r e 1 ) k n o w l e d g e o f t h e a v e r a g e r a d i a l d i st r i b u t i o n o f l o c a l d o s e a b o u t t h e p a t h o f a n i o n , 2 ) t h e s i z e o f t h et a r g e t v o l u m e , a n d 3 ) t h e r e s p o n s e o f t h e d e t e c t o r t o gamma r a y s , m e a s u r e d a s a f u n c t i o n o f d o s e . R e q u i r e m e n t s 2 a n d 3 d e t e r m i n e d e t e ct o r p a r a m e t e r s : t h e r a d i u s o f t h e t a r g e t v o l u m e a , , t h e c h a r a c t e r i s t i c d o s e E, a t w h i c h t h e r e i s a n a v e r a g e o f 1 h i t p e r t a r g e t a n d C , t h e h i t t e d n e s s i n t h e s e n s e o f t h e c u m u l a t O u r r e q u i r e m e n t s a r e i n p r i n c i p l e e x p e r i m e n t a l l y d e t e r m i n a b l e . T h u s , f o r t h e F r i c k e d o s i m e t e r E, i s d e t e r m i n a b l e f r o m t h e y i e l d a s a f u n c t i o n o f d o s e w h i l e a , i s f r o m y i e l d a s a f u n c t i o n o f F e + + c o n c e nt r a t i o n . H e r e s i z e i s r e p l a c e d by a n e f f e c t i v e d i f f u s i o n l e n g t h . H i tt e d n e s s i s d e t e r m i n a b l e by c o m p a r i s o n o f t h e s h a p e o f t h e d o s e r e s p o n s e c u r v e a f t e r gamma i r r a d i a t i o n w i t h t h a t o f t h e c u m u l a t i v e P o i s s o n d i s t r i b u t i o n ,w h e r e t h e s h a p e c a n b e m e a s u r e d . N o t e t h a t t h i s t r a c k m o d e l i s n o t m e c h a n i s t i c b u t i s r a t h e r s t at i s t i c a l a n d p a r a m e t r i c . G i v e n t h e r e q u i r e d i n f o r m a t i o n we c a n t r a n s l a t e t h e gam,ma r a y r e s p o n s e t o t h e r a d i a l d i s t r i b u t i o n o f t h e p r o b a b i l i t y o f t a r g e t a c t i v a t i o n a b o u t t h e p a t h o f a n i o n . W i t h u s eo f p s e u d o -r a n d o m n u m b e r s we c a n s i m u l a t e a p a r t i c l e t r a c k .O r by r a d i a l l y i n t e g r a t i n g t h e p r o b a b i l i t y we c a n c a l c u l a t e a n a c t i o n c r o s s s e c t i o n . When d e a l i n g w i t h a beam o f c h a r g e d p a r t i c l e s , o r t h e s e c o nd a r y p a r t i c l e s f r o m n e u t r o n s , we a s s u m e t h a t t h e P o i s s o n d i s t r i b u t i o n a d e q u a t e l y t a k e s c a r e o f o v e r l a p .F o l l o w i n g t h e a p p e a r a n c e o f p a r t i e l e t r a c k s i n e m u l s i o n we s e p a r a t e t r a c k s i n t o t h e g r a i n c o u n...

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