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TRAIN DETECTION UTILIZING ABSORPTION AND SCATTERING PHENOMENA OF RADIATION (in Japanese)

Journal Article · · Proc. Japan Conf. Radioisotopes
OSTI ID:4707990
;
A new method of train detection using radiation absorption and scattering was lnvestigated. The radioisotope as a radiation source is located on the railway tracks together with a Radiation Electronic Relay (R.E.R.). First the signaling system of the radiation-interruption type was tested. When a gamma ray traverses just above the rail and a R.E.R. with a G-M tube is activated by its incidence, the beam is absorbed by the wheels of a passing train, dropping away the R.E.R. at the same time. This system may be applied as an axle counter for the automatic control in yard operations. When bremsstrablung from Sr/sup 90/ of 0.5 C traverses the tracks, the beam is continuously interrupted by the body of a passing train. The above system installed with scintillation detectors is also promising as a train detector. Next, the intensities of back-scattered radations by massive portions of cars were measured with a halogen G-M tube of 40 x 400 mm. The values of 4000 approximates 5000 cpm were obtained on an average when Cs/sup 137/ of 10 mC was laid beside a rail on the tracks. This count rate agread well with approximately calculated values. The scattered radiations gave a R.E.R. accurate trip action even with trunk lines, demonstrating the system to be nothing but a train approach signal. When it is necessary to consider the mischecking of the system owing to noisy background pulses, cosmic ray coincidence pulses from two G-M tubes can be used after preparing the second as the spare. (P.C.H.)
Research Organization:
Railway Technical Inst., Japan National Railway
NSA Number:
NSA-17-030181
OSTI ID:
4707990
Journal Information:
Proc. Japan Conf. Radioisotopes, Journal Name: Proc. Japan Conf. Radioisotopes Vol. Vol: 5th, No. 4
Country of Publication:
Country unknown/Code not available
Language:
Japanese

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Related Subjects

GENERAL AND MISCELLANEOUS