How to measure the radioactivity of natural marble?

In general the stone is divided into marble, granite, marble radioactivity is smaller than granite.

Can be based on the color of the stone can be simple to determine the strength of the radiation, red, green, crimson exceeds the standard more, such as azalea red, Indian red, maple leaf red, rose red, etc. exceeds the standard more.

In recent years, the decoration of materials, natural stone because of its colorful, natural, strong and durable material, and is increasingly used in a variety of public **** facilities. Stone will certainly make a full house, but also with other substances in nature, contains natural radioactive elements - gamma ray particles. People receive long-term ultra-high gamma radioactive radiation, can cause radiation damage, skin disease, but also make lung cancer, leukemia incidence increased.

Previously, the traditional method of classification of stone radioactive categories is the first large stone crushed, take the weight of about 300 grams of samples sealed for 20 days, and then the gamma radioactive element content of the measurement of the division. According to the level of gamma element content, comprehensively determine the type of stone radioactivity, the fastest time is one month, and must be carried out in the laboratory, can not be widely promoted. Time-consuming and laborious, the cost of analyzing samples is also very high.

In order to make up for the shortcomings of past methods, scientists invented the field rapid stone radioactivity detector. Speaking of its invention, which is also thanks to the revelation of the photoelectric effect. We all know that Edison's invention of electric light is the conversion of electrical energy into light energy, the same light energy can also be transformed into electrical energy, which is the photoelectric effect. The rapid stone radioactivity detector is the use of the photoelectric effect of this feature, so that the detection process and results both fast and accurate. Gamma rays are similar to light, which carries a certain amount of energy. Most of the gamma rays generated in the stone can penetrate the stone itself, into the detector detector sodium iodide crystals, and with the role of the ray of energy into light, light through the detector in the photomultiplier, was amplified by the amount of shot rays.