Is wearing a gold necklace harmful to people's health?

Hehe, this is harmless. See below to understand the optical application of gold.

Gold can absorb X-rays, while gold alloys containing other elements can change the optical properties related to wavelength. As a stable coating of spacecraft, bright gold plating plays an important role in controlling the temperature of internal instruments and components of spacecraft. This is mainly because gold has good scattering and reflectivity to infrared rays in the universe, which can protect astronauts and equipment from cosmic rays.

Because gold can change the wavelength of gold alloy, thus changing the color of various metal elements. Using this characteristic of gold, special optical requirements can be achieved through certain coating. For example, a special glass made of metal-treated gold (coated with a film of 0. 13 micron) can reflect infrared rays back in hot summer and keep the room cool. This film is brown in reflected light and sky blue in incident light. If current passes through this glass, it will be transparent and pollution-free. Gold was used as a phosphor (ZnS: Cu+Zn; Au, AI) is used for the green primary color display of color kinescope. This powder is yellow-green, and emits yellow-green light under the excitation of cathode rays or 365nm ultraviolet rays.

Medical application of gold

The application of gold in medicine can be traced back to ancient times. People always think that taking gold can cure all diseases. /kloc-in the third century, the "golden drink" that people took at that time was called a panacea. China folk also use gold foil as a method to treat children's panic disorder; Gold is also widely used as dental implant material.

The univalent sulfhydryl compound of gold (auranofin) is mainly used to treat rheumatoid arthritis. Gold (J) thiomalate "gold medicine" has antibacterial effect on the lesions caused by Mycoplasma and Leishmania in the normal treatment process within the therapeutic concentration range.

Radioisotopes of gold are widely used in radiotherapy. Gold can be placed in the irradiation zone in the form of particles or colloids. Colloidal gold (198Au) is used for radiotherapy of pleural or peritoneal exudates and bladder cancer, that is, when insoluble radiopharmaceuticals are needed to uniformly irradiate irregular surfaces; Colloidal gold is also used for various diagnostic purposes, such as bone marrow scanning or liver and lung angiography, that is, colloidal gold is filled with organs to be studied, and then observed by scintillation photography; Gold foil is used to treat burned skin; Treatment of gastric cancer and lung cancer with gold vapor laser.

In medical biology research aimed at human health, precious metal elements such as gold have become important artificial organ materials and surgical transplant materials because of their good chemical stability, biocompatibility and mechanical properties. Microprobe made of gold and other precious metals has made remarkable achievements in exploring the mysteries of nervous system. Such as nerve repair and pacemakers. , all use gold and precious metals and their alloy materials.

Gold is chemically stable and will not rust when burned. The ancient gold wares are thousands of years old now, and they are still shining. It is safe to put gold in hydrochloric acid, sulfuric acid or nitric acid (single acid) and will not be eroded.

Gold culture and health care

This is the beginning of the prevalence of the idea of immortal magic in the Western Han Dynasty, and the expectation of becoming immortal and ascending to heaven is something that emperors and generals and ordinary people are extremely eager for during this period. In 133 BC, Li, an alchemist, told Emperor Wu that he could make gold from cinnabar, and make cups and plates with this refined gold, and he could live forever after drinking it. He also put forward the theory that using gold and silver vessels can prolong life, which made the production and use of gold vessels widely popular.

Since then, gold and longevity have forged an indissoluble bond. There are immortals, feathered people, rare birds and animals everywhere on the gold wares of the Han Dynasty, as well as inscriptions that directly express wishes, such as "Long live the Millennium" and "Long life is like a stone, the Queen Mother of the West (commonly known as the Queen Mother, the legendary god)". This ideological trend of longing for immortality continued until Wei (220-265) and Jin (265-420). It has been proved on many unearthed gold wares, such as the alchemy furnace in Anshapo Village, Xi, the gold-carved jade clothes and gold needles of Liu Sheng, the king of Zhongshan in Mancheng, Hebei Province, and some medicine boxes, all of which reflect the nostalgia of princes around the world for the enjoyable life and life at that time. Many gold carvings and jade clothes were unearthed, which expressed their strong desire to be resurrected even after death. Taking elixir of life was popular in Tang Dynasty, which was in line with the pursuit of elixir of life in Qin and Han Dynasties. In the Tang Dynasty, this trend was even stronger. Generally, the utensils used for alchemy are homemade ceramics, while the emperors and nobles use luxurious gold utensils. For example, a gold medicine tray was found in a gold vessel unearthed in Anhe Village, Xi 'an, which was used for cooking and heating the elixir.

To sum up, although gold is widely used, wearing gold ornaments directly is neither beneficial nor harmful to human body.