The carbon exists in the natural has three kinds of isotopes, which includes stable isotope C-12, C-13 and radioactive isotope C-14. C-14 was produced by hitting the C-12 atoms in the air by cosmic rays, its half-life period is about 5,730 years, the decay mode is β decay, and the C-14 atoms converted to nitrogen atoms. Carbon isotope techniques have been widely used in geology, environmental science, oceanography, meteorology, botany and some other fields.The main application of C-14 labeled compounds that used in medical science field is to diagnose the diseases in vivo or vitro of patients, in addition to the practical application, it also can widely used to do pathology study, as well as used in the competition radioanalysis of vitro diagnosis. The competition radioanalysis of vitro diagnosis is a microanalysis technique, it has high specificity, high sensitivity and good accuracy and precision, which can find many underlying diseases at an early stage, and take effectively to prevent the  disease.

 

C-14 Expiration Detector is a new generation instrument, which is used to detect the helicobacter pylori(HP) , the patients need only blowing five minutes without any other discomfort, then the disease can be detected. This C-14 Expiration Detector makes the people who has heart disease, hypertension or was allergy to gastroscopy to avoid the discomfort that occurs during gastroscopy, so it can be seen that C-14 Expiration Detector is one of the ideal detection methods currently. However, since C-14 is a radioactive isotope element, so the detector will inevitably exist radiation, which would restrict the applicability of the detector (such as pregnant women, who will be unfit for using C-14 Expiration Detector).

 

Due to its high density and good environmental characteristics, tungsten alloy has not only been welcomed by the people, but also the first choice of shielding materials production. The tungsten alloy shielding material applied to C-14 Expiration Detector, can better shield the detector radiations, expand its applicability scope and exert its great effectiveness.While the C-14 labeled compounds can be used as sensitive tracers, which has a very broad application prospects. With the development of scientific research and technology, the applications of C-14 is gradually extended to biological materials, biological products, renewable energy and other new technology industries, which also means that tungsten alloy shielding materials will occupy the leading position and will be developed and widely applied accompanied by the gradual deepen development and applications of C-14.