A large-area balloon-borne gamma ray detector

Details A large-area balloon-borne gamma ray detector A large-area balloon-borne gamma ray detector

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974csgr.conf..171j&link_type=abstract

In ESRO The Context and Status of Gamma Ray Astronomy p 171-173 (SEE N75-25813 16-93)

Computer Science

Performance

Balloon-Borne Instruments, Gamma Rays, Proportional Counters, Angular Resolution, Monte Carlo Method, Performance Prediction, Photons, Project Planning

Scientific paper

A gamma ray detector sensitive to gamma rays about 10 MeV and having an effective area of about 1 sq m at 8% efficiency is described. A multiwire proportional counter provides data on the direction of secondary electrons, from which the direction of the initiating photons is inferred. The system consists of an array of seven converter plates alternating with pairs of multiwire proportional counters; the array is surrounded by scintillator anticoincidence counters. A time-of-flight detector below the array triggers the system upon detecting the downward moving conversion products. The Monte Carlo calculations were used to study the expected performance of this apparatus; it was found that the instrument's permits identification of 100 MeV source of 0.000005/sq cm sec to a 3 sigma level in 4h flight.

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