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Observations on diffuse cosmic X-rays in the energy range 20–120 keV

Published online by Cambridge University Press:  14 August 2015

P. C. Agrawal ,
S. Biswas ,
G. S. Gokhale ,
V. S. Iyengar ,
P. K. Kunte ,
R. K. Manchanda  and
B. V. Sreekantan
P. C. Agrawal
Affiliation:
Tata Institute of Fundamental Research, Bombay, India
S. Biswas
Affiliation:
Tata Institute of Fundamental Research, Bombay, India
G. S. Gokhale
Affiliation:
Tata Institute of Fundamental Research, Bombay, India
V. S. Iyengar
Affiliation:
Tata Institute of Fundamental Research, Bombay, India
P. K. Kunte
Affiliation:
Tata Institute of Fundamental Research, Bombay, India
R. K. Manchanda
Affiliation:
Tata Institute of Fundamental Research, Bombay, India
B. V. Sreekantan
Affiliation:
Tata Institute of Fundamental Research, Bombay, India

Extract

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In this paper we present observations of the diffuse background X-rays in the energy range 20–120 keV, based on two balloon experiments carried out from Hyderabad (latitude 17.6°N, longitude 78.5°E), India. The flights were made on April 28, 1968 and December 22, 1968. The detector used was a NaI(Tl) crystal of effective area 97.3 cm2 and thickness 4 mm. The crystal was surrounded both by active and passive collimators. The passive collimator was a cylindrical graded shield of lead, tin, and copper, and the active collimator was a plastic scintillator surrounding the shield. The FWHM of the telescope was 18.6° and the geometrical factor for isotropic radiation 13.2 cm2 sr. The pulses from the NaI crystal were sorted into ten contiguous channels extending from 17 to 124 keV. An Am241 source came into the field of view of the telescope periodically and provided in-flight calibration of the detector. All the information was recorded on photographic film.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 37: Non-Solar X- and Gamma-Ray Astronomy , 1970 , pp. 289 - 296
Copyright
Copyright © Reidel 1970 

References

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