Sewage sludge(sludge)from cities poses a  big challenge to municipalities for its disposal.  Exposure to Gamma rays kill pathogens, reduce smell, kill weeds and degrade chemicals in the sludge. The study shows that an  average10 kGy gamma radiation dose can reduce microbiological load by 4 log cycles which is considered  enough for hygienisation of the  sludge. The Hygienised sludge can be used as  carrier for inoculation  which allows enhanced  growth of  added  plant growth promoting microorganisms(PGPB) by  more than 100 times(Bio-Gold)Use of 1 tons/hectare/crop of Bio-Gold results in  lower pollutant loading in the soil and increased productivity of Potato, Tomato and Wheat and saved  20% of chemical fertilizers. Based on the study, Bio-Gold specifications have been suggested. Two large scale Co-60 facilities,1.5 million curies each, 100 tons/day at  Ahmedabad City (AMC,2019) and Indore City (IMC,2022) cities were established and  have been in operation in India. It is for the first time where irradiation and inoculation is being used on large scale,    resulting in use of lower quantities of sludge   with improved productivity. The method would not only recycle a waste material but also improve organic contents of soil, a need of present day world over. Basis of  the technology, technological challenges, comparison with liquid sludge irradiation, economic considerations, field trials and future recommendations have been discussed in this presentation.