How to prepare tungsten needle? You should prepare the following materials at first:

Ultrathin tungsten needle has advantages of high hardness and strong ductility. Also, it is not easy to break with durability. The diameter of tip of tungsten needle can reach micron level, which can be used to dissect and separate individual human cells, such as inner ear labyrinth cells. Some experts use 0.32mm tungsten wire to prepare ultrathin tungsten needles. They pre-machined the tips of fine tungsten wire blanks into needle-shaped, sickle-shaped, or hook-shaped needles. The diameter of the tip of these tungsten needles is generally 3 to 10 μm, and the smallest diameter can reach 1.5 μm.

Tungsten needle is an elongated tungsten product made of pure tungsten or tungsten alloy, having the advantages of high temperature resistance, high hardness, and good conductivity. Tungsten needle can be used as an electrode material for argon arc welding (the fastest growing and most widely used welding technology at home and abroad), as a probe needle for detecting instrument, or as a dissection needle for various minimally invasive surgery.

Tungsten heavy alloy is also called tungsten alloy. The main component of tungsten alloy can be W-Ni-Fe, W-Ni-Cu or W-Ni-Cu-Fe, among which other metals such as cobalt, molybdenum, and chromium can also be added. The density of tungsten heavy alloy is twice that of steel, and 1.5 times of lead (conventional radiation shielding material). Moreover, tungsten alloy is an environmentally friendly material, which is non-toxic and pollution-free, so it is more suitable for collimator applications as a radiation protection material than heavy metal lead.

Tungsten alloy is a safe and reliable radiation shielding material that can replace the traditional radiation shielding material lead for parallel-hole collimator - the most commonly used collimator for stationary SPECT imaging in hospitals. As a new type of radiation shielding material, tungsten alloy has many advantages such as high strength, good processability, no secondary bremsstrahlung radiation, and environmental protection for applications of parallel-hole collimator. Also, the thickness of tungsten alloy is only 2/3 of lead to obtain the same shielding effect. Wherein, SPECT is the short for single photon emission computed tomography.

Tungsten alloy collimator is also known as tungsten heavy alloy collimator or high-density tungsten alloy collimator. Collimator is a key component of gamma camera - the most basic imaging equipment in nuclear medicine, and affects the imaging quality. So, it is very important to choose the raw material of collimator. Tungsten alloy has good absorption and shielding performance to 60Co, 137Cs and other strong gamma ray sources, and therefore, it is regarded as the best shielding material for collimators. And tungsten alloy collimator can prevent γ-ray omission from causing permanent harm to medical workers, patients and their family members.

As a medical radiation shielding material, tungsten alloy shield may be a tungsten alloy collimator, a tungsten alloy isotope container, a tungsten alloy syringe shield, a tungsten alloy shield door, and the like. They are all high-density tungsten alloy parts. You know, the higher the density, the better the radiation shielding performance.

Tungsten heavy alloy collimator, an important part of detector of SPECT system, is a collimator made of high density tungsten-based alloy with composition of W-Ni-Fe, W-Ni-Cu or W-Ni-Cu-Fe. There are a certain number of holes arranged on the collimator. According to the form of the drilled hole, the tungsten heavy alloy collimator is divided into tungsten alloy parallel-hole collimator, tungsten alloy focusing collimator, tungsten alloy converging collimator, and tungsten alloy pinhole collimator.

Lead shield is a thing of past. Tungsten alloy X-ray shield, a newly developed poison-free shielding partition, is the future in hospitals or dental clinics, which can fully protect the medical workers and patients from different radiation resources such as X-rays. It has been reported that tungsten alloy X-ray shield is safe as it is non-toxic, fire-resistant and anti-corrosion with premium stability. Also, it features excellent sound insulation properties. And it can create an excellent and robust surface.

Compared with lead, tungsten alloy has higher density and better radiation shielding performance, so it is often used as a radiation protective material in medical electron linear accelerator. In addition, taking the factors of environmental protection, tungsten alloy shields are more and more popular and are gradually replacing lead shields in the field of radiation shielding.