... One way is to use a patterned mask of material which can cast gamma-ray shadows on a digital detector array. ... In place of a coded mask , familiar objects were positioned in front of a detector array and illuminated with gamma-rays in a laboratory test. ... Destined to fly on the International Gamma-Ray Astrophysics Laboratory ( INTEGRAL ) satellite scheduled for launch in October of this year, the detector array is part of the imaging gamma-ray telescope, IBIS . ... NASA Official: Jay Norris. ...