THE APPLICATION OF RADIOISOTOPES TO RAILWAY SIGNAL SYSTEM

Journal Article · Tue May 01 04:00:00 EDT 1962 · Denki Zasshi OHM

OSTI ID:4653110

Sakai, S

A gamma -ray source of 1-mC Co/sup 60/ sealed in a pig iron container was installed under a car. The detector used was a G-M counter in a brass case and buried underground between two rails. When a train passes, the detector triggers the relay circuit, which sends out the signals. Two types of G-M counters, type-8165 (25 mm x 280 mm) and type8168 (50 mm x 330 mm), were used. Type 8168 was 5 times more sensitive than type-8165 and gave good results for source-detector distance between 20 approximates 30 cm and speed 25 approximates 82 km/hr. Type 8165 succeeded at 20 cm and 25 approximates 55 km/ hr, but failed at 30 cm and 76 approximates 82 km/hr. It was concluded that 20 cm is the proper distance between the source and detector. The device surpasses the conventional contact type signal system in its simplicity, lower cost, applicability to distinguish train type or determine train speed, and is undisturbed by bad circumstances such as snow and gravel due to gamma -ray penetrating power. (OID)

• Research Organization: Tokyo Electrical Railway Express
• NSA Number: NSA-17-036095
• OSTI ID: 4653110
• Journal Information: Denki Zasshi OHM, Journal Name: Denki Zasshi OHM Vol. Vol: 49: No. 5
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

CIRCUITS
COBALT 60
COPPER ALLOYS
ECONOMICS
FERMI INTERACTION
GAMMA SOURCES
GEIGER-MUELLER COUNTERS
INDUSTRIAL APPLICATIONS OF ISOTOPES AND RADIATIONS
IRON
MECHANICAL STRUCTURES
RADIOISOTOPES
RAILWAY
RELAYS
SEALS
SENSITIVITY
SIGNALS
SOILS
TRANSPORT
USES
VESSELS
ZINC ALLOYS