law: Atomic Energy Act, 1962 
  2. Definitions and interpretation 
  (1) In this Act,
  
  unless the context otherwise requires,- 
  (a)  "atomic
  
  energy" means energy released from atomic nuclei as a result of any process,
  
  including the fission and fusion processes,
  (b) "fissile material" means uranium
  
  233, uranium 235, plutonium or any material containing these substances or any
  
  other material that may be declared as such by notification by the Central Government;
   1  [(bb) "Government Company" means a
  
  company in which not less than fifty-one per cent, of the paid up share capital
  
  is held by the Central Government;]
  (c) "minerals" include all
  
  substances obtained or obtainable from the soil (including alluvium or rocks)
  
  by underground or surface working;
   (d) "notification" means notification published in the
  
  Official Gazette;
  (e) "plant" includes machinery,
  
  equipment or appliance whether affixed to land or not;
  (f) "prescribed equipment" means any
  
  property which the Central Government may, by notification, prescribe, being a
  
  property which in its opinion is specially designed or adapted or which is used
  
  or intended to be used for the production or utilisation 
  
  of any prescribed substance or for the production or utilisation 
  
  of atomic energy, radioactive substances, or radiation, but does not include
  
  mining, milling, laboratory and other equipment not so specially designed or
  
  adapted and not incorporated in equipment used or intended to be used for any
  
  of the purposes aforesaid;
  (g) "prescribed substance" means any
  
  substance including any mineral which the Central Government may, by
  
  notification, prescribe, being a substance which in its opinion is or may be
  
  used for the production or use of atomic energy or research into matters
  
  connected therewith and includes uranium, plutonium, thorium, beryllium,
  
  deuterium or any of their respective derivatives or compounds or any other
  
  materials containing any of the aforesaid substances;
  (h) "radiation" means gamma rays,
  
  X-rays, and rays consisting of alpha particles, beta particles, neutrons,
  
  protons and other nuclear and sub-atomic particles; but not sound or radio
  
  waves, or visible, infrared or ultraviolet light;
  ( i )
  
  "radioactive substance" or "radioactive material" means any
  
  substance or material which spontaneously emits radiation in excess of the
  
  levels prescribed by notification by the Central Government.
  (2) Any reference in
  
  this Act to the working of minerals shall be construed as including a reference
  
  to the mining, getting, carrying away, transporting, sorting, extracting or
  
  otherwise treating of minerals.
  (3) Any reference in
  
  this Act to the production or use of atomic energy shall be construed as
  
  including a reference to the carrying out of any process, preparatory or
  
  ancillary to such production or use.