The Disk-M telescope operated in the energy range 20 keV-5 MeV . It consisted of Sodium iodide scintillation crystals, and had an angular resolution of 25 arcminutes.
2.
The X-ray telescope onboard OSO 4 consisted of a single thin NaI ( Tl ) scintillation crystal plus phototube assembly enclosed in a CsI ( Tl ) anti-coincidence shield.
3.
The Sail carried a hard X-ray experiment from UCSD, with a single thin NaI ( Tl ) scintillation crystal plus phototube enclosed in a howitzer-shaped CsI ( Tl ) anti-coincidence shield.
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