COMPTEL SPECIFICATIONS

1. Detectors:
 
   a. Detector type: 

      1) upper detector D1:  liquid scintillator NE 213A 

      2) lower detector D2:  NaI(Tl) 
 
   b. Geometric arrangement: 

      1) D1:  7 cylindrical modules 27.6 cm in diameter and 
              8.5 cm deep; total geometric area 4188 cm2

      2) D2:  14 cylindrical modules 28 cm in diameter and  
              7.5 cm deep; total geometric area 8620 cm2
 
   c. Effective area for gamma-rays: 20 - 50 cm2
      (no event selections applied to the data) 
 
   d. Energy range:  0.8 - 30 MeV 
 
   e. Energy resolution:  5 - 8% (FWHM) 
 
   f. Angular resolution:  1.7 - 4.4 degrees (FWHM) 
 
   g. Geometric factor:  5 - 30 cm2 sr 
 
   h. Field-of-view:   1 sr 
 
   i. Accuracy of Source Position Determination:  5 - 30 arcmin 
 
2. Experiment Sensitivities:
 
   a. Telescope Observations of a Point Source 

      1) Minimum source detectability at 3 sigma, 1-30 MeV 
         (2-week observation) 
         = 1.6 x 10-4 cm-2 s-1  

      2) Line sensitivity 
         (3 sigma, 2-week observation) 
         = 6 x 10-5 cm-2 s-1 at 1 MeV 
         = 1.5 x 10-5 cm-2 s-1 at 7 MeV 
 
   b. Burst Observations 

      1) Telescope mode 
         lower limit: S(>1 MeV) = 2 x 10-6 erg cm-2 
         upper limit: S(>1 MeV) = 1 x 10-4 erg cm-2 (45 s duration) 

      2) Single detector burst mode 
         variable, depending on duration 


   c. Solar Flare Observations 

      1) Telescope mode 
         = 1.2 ph cm-2 (1-3 MeV, 100 s duration) 
         = 0.5 ph cm-2 (3-10 MeV, 100 s duration) 

      2) Single detector burst mode 
         as for burst observations, above 
 
3. Miscellaneous Instrument Specifications:
 
   a. Weight:   1460 kg 

   b. Dimensions:  2.61 m x 1.76 m diameter 

   c. Power:   206 W 

   d. Telemetry Rate:  6125 bit/s (equivalent time-average) 

   e. Timing accuracy:  +/- 1/8 msec with respect to UTC. 

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