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LET-spectra measurements from accelerated beams of energetic heavy particles
A b s t r a c t s - - I 1 th 1CSSNTD
389
CHARGED-PARTICLE RADIOGRAPHYAND COMPUTERIZED TOMOGRAPHY E. V. Benton*, R, P. Henke*, C. A. Tobias**, W. R. Holley**, J. I . Fabrikant**, and D. L. Henshaw*** *University of San Francisco, San Francisco, California 94l]7, USA **Lawrence Berkeley Laboratory, University of California Berkeley, California 94729, USA ***H. H. Wills Physics Laboratory, University of Bristol Bristol BS8 ITL, England
ABSTRACT Charged-particle radiography and computerized tomography are being developed for the medical diagnostic imaging of tumors and other abnormalities which result in tissue density differences, Beamsof high-energy carbon and neon particles accelerated by the Berkeley Bevalac are being used in conjunction with nuclear track detectors. I t has been demonstrated that these methods are feasible and are capable of high resolution. Differences in tissue densities as small as 0.2% have been detected and measured. Comparisonbetween heavy-ion CT images and X-ray CT images are discussed.
L E T - S P E C T R A M E A S U R E M E N T S FROM A C C E L E R A T E D BEAMS OF E N E R G E T I C HEAVY P A R T I C L E S E. V. Benton,
R. P. Henke,
Physics Department, San Francisco,
University california
W. H e i n r i c h Siegen,
C. S. Johnson of San F r a n c i s c o 94117, USA
and R. Rudat
U n i v e r s i t y of Siegen Federal R e p u b l i c of Germany
ABSTRACT Plastic track detectors are being used in the c h a r a c t e r i z a t i o n of heavy energetic, a c c e l e r a t o r - p r o d u c e d charged p a r t i c l e beams such as 2°Ne and 28Si as these beams traverse d i f f e r e n t thicknesses of d i f f e r e n t a ~ sorbers. F r a g m e n t a t i o n of the b e a m particles is r e c o r d e d with CR-39 d e tectors y i e l d i n g LET200 spectra. The m e a s u r e m e n t s are c o m p a r e d w i t h t h e o r e t i c a l calculations.
A M E A S U R E M E N T OF C O S M I C - R A Y L E T - S P E C T R A USING A M I C R O P R O C E S S O R SUPPORTED M I C R O S C O P E
Department
J.Beer,
W.Heinrich
of Physics,
University
of Siegen,
5900 Siegen U - G e r m a n y
ABSTRACT A m i c r o p r o c e s s o r s u p p o r t e d s e m i - a u t o m a t i c s y s t e m for m e a s u r e m e n t s of n u c l e a r tracks in p l a s t i c detectors is presented. It consists of a m i c r o s c o p e and a stepping m o t o r d r i v e n stage. A M o t o r o l a m i c r o p r o cessor MC 6800 controls the measurement. It accepts the c o - o r d i n a t e s of the stage as well as the p o s i t i o n of the focus and computes cone length and dip angle from the t h r e e - d i m e n s i o n a l co-ordinates. LETspectra were m e a s u r e d from two cellulose nitrate foils of the Biostack III e x p e r i m e n t flown with the A p o l l Q - S o y u s - T e s t - P r o j e c t in 1975.
389
CHARGED-PARTICLE RADIOGRAPHYAND COMPUTERIZED TOMOGRAPHY E. V. Benton*, R, P. Henke*, C. A. Tobias**, W. R. Holley**, J. I . Fabrikant**, and D. L. Henshaw*** *University of San Francisco, San Francisco, California 94l]7, USA **Lawrence Berkeley Laboratory, University of California Berkeley, California 94729, USA ***H. H. Wills Physics Laboratory, University of Bristol Bristol BS8 ITL, England
ABSTRACT Charged-particle radiography and computerized tomography are being developed for the medical diagnostic imaging of tumors and other abnormalities which result in tissue density differences, Beamsof high-energy carbon and neon particles accelerated by the Berkeley Bevalac are being used in conjunction with nuclear track detectors. I t has been demonstrated that these methods are feasible and are capable of high resolution. Differences in tissue densities as small as 0.2% have been detected and measured. Comparisonbetween heavy-ion CT images and X-ray CT images are discussed.
L E T - S P E C T R A M E A S U R E M E N T S FROM A C C E L E R A T E D BEAMS OF E N E R G E T I C HEAVY P A R T I C L E S E. V. Benton,
R. P. Henke,
Physics Department, San Francisco,
University california
W. H e i n r i c h Siegen,
C. S. Johnson of San F r a n c i s c o 94117, USA
and R. Rudat
U n i v e r s i t y of Siegen Federal R e p u b l i c of Germany
ABSTRACT Plastic track detectors are being used in the c h a r a c t e r i z a t i o n of heavy energetic, a c c e l e r a t o r - p r o d u c e d charged p a r t i c l e beams such as 2°Ne and 28Si as these beams traverse d i f f e r e n t thicknesses of d i f f e r e n t a ~ sorbers. F r a g m e n t a t i o n of the b e a m particles is r e c o r d e d with CR-39 d e tectors y i e l d i n g LET200 spectra. The m e a s u r e m e n t s are c o m p a r e d w i t h t h e o r e t i c a l calculations.
A M E A S U R E M E N T OF C O S M I C - R A Y L E T - S P E C T R A USING A M I C R O P R O C E S S O R SUPPORTED M I C R O S C O P E
Department
J.Beer,
W.Heinrich
of Physics,
University
of Siegen,
5900 Siegen U - G e r m a n y
ABSTRACT A m i c r o p r o c e s s o r s u p p o r t e d s e m i - a u t o m a t i c s y s t e m for m e a s u r e m e n t s of n u c l e a r tracks in p l a s t i c detectors is presented. It consists of a m i c r o s c o p e and a stepping m o t o r d r i v e n stage. A M o t o r o l a m i c r o p r o cessor MC 6800 controls the measurement. It accepts the c o - o r d i n a t e s of the stage as well as the p o s i t i o n of the focus and computes cone length and dip angle from the t h r e e - d i m e n s i o n a l co-ordinates. LETspectra were m e a s u r e d from two cellulose nitrate foils of the Biostack III e x p e r i m e n t flown with the A p o l l Q - S o y u s - T e s t - P r o j e c t in 1975.