Patent Number: 
Section: claims

1. A tracer delivery system which comprises of a melamine formaldehyde resin (MFR) polymer wherein the polymer is doped with one or more tracers and the polymer releases tracer after placement in a liquid system; andwherein the amount of tracer is about 5-20% by weight based in the total weight of the system and wherein the doping of the polymer comprises of mixing the tracer with a MFR condensate solution comprising of melamine, formaldehyde, methanol and water prior to hardening the solution with a hardener. 2. The system of claim 1, wherein the tracer is a radioactive tracer. 3. The system according to claim 2, wherein the radioactive tracer is 3H or 14C. 4. The system of claim 1, wherein the tracer is a non-radioactive tracer. 5. The system according to claim 4, wherein the non-radioactive tracer is naphthalenesulphonic acid, amino naphthalenesulphonic acid, fluorinated benzoic acid or salts thereof. 6. The system of claim 1, wherein the system may further comprise fillers, plasticizers, stabilizers and/or colorants. 7. A method of verifying fluid flow of a liquid system which comprises applying a tracer delivery system of claim 1 to an upstream location of the liquid system and detecting the amount of tracer released into the liquid system at a downstream location of the liquid system. 8. The method of claim 7, wherein the tracer delivery system has an amount of tracer is about 5-20% by weight based in the total weight of the system, the tracer is a radioactive tracer which is 3H or 14C and may further comprise fillers, plasticizers, stabilizers and/or colorants. 9. The method of claim 7, wherein the tracer delivery system has an amount of tracer is about 5-20% by weight based in the total weight of the system, the tracer is a non-radioactive tracer which is naphthalenesulphonic acid, amino naphthalenesulphonic acid, fluorinated benzoic acid or salts thereof and may further comprise fillers, plasticizers, stabilizers and/or colorants. 10. The method of claim 7, wherein the polymer releases tracer for up to about one year after placement in a liquid system. 11. A method of verifying fluid flow at multiple locations of a liquid system which comprises applying a tracer delivery system of claim 1 to each desired upstream location of the liquid system and detecting the amount of tracer released into the liquid system at each downstream location the liquid system which corresponds to the respective desired upstream location. 12. The method of claim 11, wherein the tracer delivery system has an amount of tracer is about 5-20% by weight based in the total weight of the system, the tracer is a radioactive tracer which is 3H or 14C and may further comprise fillers, plasticizers, stabilizers and/or colorants. 13. The method of claim 11, wherein the tracer delivery system has an amount of tracer is about 5-20% by weight based in the total weight of the system, the tracer is a non-radioactive tracer which is naphthalenesulphonic acid, amino naphthalenesulphonic acid, fluorinated benzoic acid or salts thereof and may further comprise fillers, plasticizers, stabilizers and/or colorants. 14. The method of claim 11, wherein the polymer releases tracer for up to about one year after placement in a liquid system.