Method for sterilizing, certificating and tracing of liquid nitrogen

A method for sterilisation, certification and traceability of liquid nitrogen, comprising the steps of

• preparing a container, provided with an opening and a surface, in use, and pouring a batch of liquid nitrogen to be sterilised into it;
• preparing an identification element uniquely associable to said batch of liquid nitrogen, said identification element comprising an indicator of the state of sterilisation of the batch of liquid nitrogen contained in said container configured so as to modify its appearance following exposure to ultraviolet radiation;
• associating said identification element with said container of the batch of liquid nitrogen to be sterilised, positioning it on a portion of said container, adjacent to said opening;
• and
• performing a sterilisation treatment of said batch of liquid nitrogen by means of exposure to ultraviolet radiation for a predetermined period of time, so as to modify at least one characteristic of said indicator, perceivable by a user, so as to certify a successful sterilisation of said batch of liquid nitrogen.