Data Structures

Externally the geometry data is held in 2 types of title bank:-

GEDS

GEometry DeSign. This contains details of the size and shape of a detector element region. It also records the total volume of the region. This is needed to calculate the correct weighting when picking points in multiple regions. See section 12.1.2.

GEDP

GEometry DePloyment. This describes the position of the region.

The bank number is the region type number, so, for example, the positions of all PMTS (region type 420) is held in the GEDP 420 bank.

Internally the geometry data is held in COMMON blocks defined in the following INCLUDE files:-

ge_titles.inc 		 Holds link access banks for all titles banks. 


ge_array_data 		 Holds data on the positioning of detector element arrays. 


ge_current.inc 		 Information about the current call to the geometry. 


ged_current.inc 		 Information about the current detector element. 


gep_current.inc 		 Information about the current geometry primitive.