Cqc Laboratory CQM Ul Testing Lab Environmental Radioactivity Detection Third-party authentication service

Provide a variety of radioactive detection items

Heat from radioactive elements is the main source of geothermal energy. Radioactive substances act not only in their local area, but also on the whole body. Granite, marble tiles and some brightly colored stones and gems contain a lot of radioactive elements. Radioactive material can change the permeability of blood vessels, leading to bleeding and concurrent infection. Serious damage to the living function of the body and make life activities stop. Large doses of radioactive substances can rapidly cause pathological changes when they act.

Product range:

Ionizing radiation:

Ionizing radiation is usually also known as radioactive radiation, because the energy of this kind of radiation is higher, it can cause atomic ionization of the surrounding material, so it is called ionizing radiation. In the field of radiation protection, ionizing radiation refers to radiation that produces ion pairs in biological matter. Ionizing radiation can be divided into α, β, γ(X), N and other radiation according to the nature of the composed particles. Sources of ionizing radiation can be radionuclides (both natural and manufactured), nuclear reaction devices such as reactors, colliders, accelerators, nuclear fusion devices, etc., or X-ray machines used for medical diagnosis and treatment.

The electromagnetic radiation:

Electromagnetic radiation is the radiation produced by electromagnetic waves into the surrounding space due to alternating electric and magnetic fields. Because of the low energy of this type of radiation, it cannot cause ionization of surrounding material. Strictly speaking all electrical appliances (including household appliances) will produce electromagnetic radiation, but the real causes pollution of the environment affects human health is some high power communication equipment, such as radar, television and radio transmitters, industrial microwave heater (microwave oven can also have the electromagnetic radiation), radio frequency induction and dielectric heating equipment, high voltage power transmission and transformation equipment, Electromagnetic medical and diagnostic equipment and so on. Because of the different nature of radiation, the mechanism of its action on the human body is also different from that of ionizing radiation. Electromagnetic radiation has near field and far field, it is divided by the distance of one wavelength. The electromagnetic field intensity in the near field is much greater than that in the far field, so it is the key point of monitoring and protection.

Detection method for radioactive elements:

1. Physical method (Mass spectrometry)

Calculated by determining the relative atomic mass of an isotope, based on its abundance in nature. The greatest advantage of this method is its high accuracy. In the mass spectrometer, the elements in the sample under test are generated by cathode rays into positively charged ions, which are deflected by electric and magnetic fields. Regardless of the size of the speed of positive ions, as long as the charge and mass ratio (E/m, referred to as the charge/mass ratio) of the same ions will converge in one place, will leave traces on the photographic plate; Positive ions with different E/M will converge at different locations, thus forming the corresponding lines. The relative masses of these ions or elements can be obtained by comparing the positions of these lines with the spectral lines on the l2C atomic mass spectrum and the corresponding mass scales. The relative abundances of these elements were obtained by measuring the intensity of ion current with a current detector, and then the relative atomic masses of the elements were calculated.

2. Chemical methods

First, a pure halide of the element is prepared, and then add the same amount of silver nitrate to a certain amount of halide sample solution, and then determine the weight of silver halide by gravimetric method,Calculate the relative atomic mass.

Radioactive element detection standard:
DIN 25457-2-1995 Radioactive residue release and activity measurement of non-input elements from nuclear installations. Part 2: Principles of alpha - ray measurement
GBZ/T 200.5-2014 Reference persons for radiation protection -- Part 5: Elemental composition of the human body and elemental content of major tissues and organs
GOST 27566-1987 Extra pure substance. Determination of chemical elemental impurities in liquid phase substances by atomic - radioactive spectroscopy
YB/T 4486-2015 Guidelines for Iron mine dump reclamation

Certification services

The test report issued by Global Zhongyi has legal effect and can be used in scenarios such as the entry of supermarkets, product appeals, anti-malicious rights protection, and auctions (appeals and auctions must meet Party A's testing requirements).