SELECTIVE SIGNAL DETECTOR

Patent · Tue Jan 01 04:00:00 EST 1963

OSTI ID:4722746

Waddel, R C

A radiation detector system is designed for detecting a desired radiation among more intenae radiation, particularly beta particles in a background field of gamma rays. The system is based on the method of altering the radiation path to absorb periodically the desired radiation and cancelling out the pulses due to the background with pulses of opposite polarity. In the embodiment for detecting betas in a gamma field, the radioactive air is pumped through a filter placed in the path of a scintillation detector. The detector output is amplified and fed to a pulse generator having electric charges of both polarities, and the resulting pulses are stored in a condenser. The radiation incident on the detector is modulated by a rotatlng absorber. When the absorber is in the radiation path, the gammas but not the betas are detected, and a cam actuates a double throw switch to reverse the polarity of the pulses from the pulse generator. Thus, the pulses due to the gamma radiation are cancelled out. (D. L.C.)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-008676
• Assignee: U.S. Navy
• Patent Number(s): US 3071688
• OSTI ID: 4722746
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
AIR
AMPLIFIERS
BACKGROUND
BETA DETECTION
CAPACITORS
GAMMA RADIATION
INSTRUMENTS AND INSTRUMENTATION
PLANNING
PULSE GENERATORS
PULSES
RADIATION DETECTORS
SCINTILLATION COUNTERS
SIGNALS
SWITCHES