Long Period Gratings (LPGs) have been developed using carbon dioxide laser in a standard optical ﬁbre. LPGs with a periodicity of 600 𝜇m and grating length of 24 mm have been inscribed on standard single mode ﬁbre. Such gratings have been used in designing temperature sensors and temperature is monitored up to 80°C. The sensitivity of such type of sensor is 0·06 nm/° C where as for standard Fibre Bragg Grating (FBG) it is 0·011 nm/°C. The LPG performance is also evaluated after 𝛾-ray irradiation for total dose of 5 KGy and has not shown any effect on transmission spectrum.