PURPOSE: To obtain a high natural spatial resolution and detection efficiency while achieving a reduction in the cost of the equipment as a whole, by using a charge split type SWPC.
CONSTITUTION: A hexagonal SWPC1 has a hexagonal chamber 2 and an inert gas with a high atomic number and a quenching gas is sealed up thereinto at a high atmospheric pressure. One wire 3 is supported with an insulator strut 4 in the chamber 2 and a high voltage is applied to the wire 3 to turn outer walls 21 and 22 to a ground potential. Radiation from the RI in a person 6 to be inspected is made incident into the chamber 2 through a number of parallel slots of a hexagonal collimator 5 in the SWPC1 to obtain 1-dimensional positional information of the incident radiation along the length of the wire 3. Then, a subtractor 33, an adder 34 and a divider 35 are used to obtain a position signal and an energy signal thereby assuring an accurate discrimination of position.
AZUMA YOSHIBUMI
FUJIEDA ICHIRO
