RAILWAY SIGNALLING SYSTEMS USING RADIOISOTOPES LOCATED ON TRACKS AND THE CONTINUATIVE CHECKING OF THEIR ACTIONS BY COSMIC RAY BACKGROUND RADIATION (in Japanese)
Journal Article
·
· Genshiryoku Kogyo (Japan)
OSTI ID:4039058
Preliminary tests on several types of radioisotope signalling systems are reported, including an axle counter, a recorder of the interception of gamma rays by passing trains, and a Bremsstrahlung detector utilizing absorption of / sup 90/Sr radiation by passing trains. A radiation-reflection train detector was also tested as an approach signal for highspeed trains. The device uses gamma rays scattered from a passing train to activate a relay located beside the /sup 137/Cs source. For fail-safe operation, a system of duplicate Geiger counters and circuits is used to feed cosmic-ray background pulses to a monitoring relay, which gives a warning indication of the failure of a Geiger tube or circuit. (from NSA of Japan)
- Research Organization:
- Japanese National Railways
- NSA Number:
- NSA-18-018253
- OSTI ID:
- 4039058
- Journal Information:
- Genshiryoku Kogyo (Japan), Journal Name: Genshiryoku Kogyo (Japan) Vol. Vol: 9: No. 10; ISSN GKOGA
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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