Tungsten Alloy Shielding for Ionizing Radiation

Astronauts traveling from planet to planet are exposed to the natural radiation of space. This is generally always particle radiation, and the exposure time is "chronic". The sun's ultraviolet light is a form of radiation that can give your skin a sunburn. Ionizing radiation is more penetrating, so it is capable of giving you a lethal "sunburn" on your internal organs. The general term for dangerous unhealthy everybody-panic-now kind of radiation is "ionizing radiation." This is because the radiation is capable of ionizing atoms which composes the material being irradiated. Non-ionizing radiation such as visible light and radio waves can be safely ignored.The sun's ultraviolet light is a form of radiation that can give your skin a sunburn. Ionizing radiation is more penetrating, so it is capable of giving you a lethal "sunburn" on your internal organs. The general term for dangerous unhealthy everybody-panic-now kind of radiation is "ionizing radiation." This is because the radiation is capable of ionizing atoms which composes the material being irradiated. Non-ionizing radiation such as visible light and radio waves can be safely ignored (by which I mean a laser beam can chop you into bits but it won't give you cancer).Here, tungsten alloy shielding material could be used as good material for radiation protection, which is usually made with tungsten content of 90%W~97%W, and the higher tungsten content, then the better absorption ability would be.

Tungsten Alloy Shielding for Radiation Stopping

The extended health data and dosimetry including external irradiation and transuranium elements are available for staff of the “Shelter” object at the RCRM. The existing experience of French and other international registries as well as of the State registry of exposed after Chernobyl, the Clinical-epidemiological registry, and dosimetry databases gained in the Research Center for Radiation Medicine from the prospective follow-up studies could help for practical implementation of the nuclear workers registry. Several tasks are foreseen that could be successfully implemented with international cooperation: a survey of professions, types of jobs and radiation qualities; development of qualification criteria and accreditation procedures for personal dosimetry services; pilot study of medical registry of occupationally exposed workers. Establishment of a new multi-thousand cohort for both prospective and retrospective biomedical and epidemiological studies will allow more precise estimated of the low dose effects of ionizing radiation. 

The density of a material is related to its radiation stopping ability. Higher density means better stopping power and shielding. Due to a higher density, tungsten heavy alloy has a much higher stopping power than lead. Its greater linear attenuation of gamma radiations means that less is required for equal shielding. Alternatively equal amounts of tungsten shielding provide diminished exposure risks than equivalent lead shielding. For more details, please visit tungsten alloy shielding.

Tungsten Alloy Radiation Shielding for Radiation Protection Problem-1

Nuclear energy sector in Ukraine includes 50,000 workers of the 15 power and research units, uranium mines, radioactive waste storages, staff of the Chernobyl zone and the “Shelter” object. Creation of a centralized registry with dosimetry and health data is essential and such understanding exists at the governmental and local levels. However, de facto this work is initiated slowly due to lack of budgetary funding. An analysis was performed of the existing sources of health and dosimetry data information. Two surveys defined the general status of dosimetry monitoring and number of occupationally exposed workers. The local data sources will be used including individual data from the local medical-sanitary departments, dosimetry shops and regional registries for radiologists. Cancer statistics of sufficient quality of case identification and pathological data could be obtained by linkage from the National cancer registry. 

In this case, we need high density of radiation shielding to have a radiation protection, it is reported that tungsten alloy material is the suitable material as its high density almost similar to real gold, the denser density, and then the better radiation absorption. More information, you could visit Tungsten Alloy Radiation Shielding for Radiation Protection Problem.

Radiation Leakage and Tungsten Alloy

The Valencia applicators which are accessories of the microSelectron-HDR afterloader (Nucletron, Veenendaal, The Netherlands) are designed to treat skin lesions. These cup-shaped applicators are an alternative to superficial/orthovoltage x-ray treatment units.

They limit the irradiation to the required area using tungsten alloy shielding, and are equipped with a tungsten alloy flattering filter allowing the treatment of skin tumors, the oral cavity, vaginal cuff, etc. The tungsten alloy thickness to shield radiation is not the same in all parts of the applicators. This fact led us to question whether the leakage radiation differs depending on where it is measured, and whether this may be relevant in some clinical cases. The purpose of this work is to study from the radiation protection point of view the radiation leakage of the Valencia applicators, and provide a solution for current users and for the manufacturer.

Flexible Tungsten Shielding Materials

Radiation includes many types such as α-rays, β-rays, γ-rays, χ-rays and neutron rays. Since the penetrating power of each type of radiation is known, radiation can be blocked by selecting appropriate thicknesses based on materials.

Recently, tungsten alloys are widely used as an environment friendly material. Since tungsten alloys of higher density have higher radiation absorption factors, shielding materials can be easily produced with small thicknesses.

Recently, flexible tungsten shielding materials added with polyethylene, paraffin, etc. that can be reduced in size and can block neutron rays, γ-rays and χ-rays simultaneously have been developed and are used together with other materials.

Of them, tungsten sheet type shielding materials have excellent radiation shielding performance and thus can be applied as shielding materials for various types of X-ray equipment and they can be attached to the inside or outside of storage containers when they are used.

Neutron Shielding Properties of a New High-Density Concrete

The neutron shielding properties of a new high-density concrete developed in Spain have been characterized experimentally. The shielding properties of this concrete against photons were previously studied and the material is being used to build bunkers, mazes and doors in medical accelerator facilities with good overall results. In this work, the objective was to characterize the material behaviour against neutron, as well as to test alternative mixings including boron compounds in an effort to improve neutron shielding efficiency. With this purpose, different thickness were exposed to an Am-Be neutron source under controlled conditions in the neutron measurements laboratory. The original mix, which includes a high fraction of magnetite, was then modified by adding different proportions of anhydrous borax. In order to have a reference against common concrete used to shielding medical accelerator facilities, then same experiment was repeated with ordinary concrete slabs.

As far as I know, tungsten material could also be used for radiation protection. But for the information whether it could be used for neutron shielding, and how could it protect, you could visit tungsten alloy.

Radiation Exposure on Mars

The 210-day trip on Mars results in radiation exposure of the crew of 386 +/- 61 mSv. On the surface, they will be exposed to about 11 mSv per year during their excursions on the surface of Mars. This means that the settlers will be able to spend about sixty years on Mars before reaching their career limit, with respect to ESA standards. In this way, radiation protection for scientific research is very important for scientist. 

According to studying, which shows that tungsten material has a high density 65% denser than lead and 130% denser than steel, if the material goes denser, then the radiation absorption ability will be better. 

We could get the calculation from the following formula:

Formula: K = e0.693 d / △1/2

K: Shield weakened multiple

△ 1/2: The shielding material of the half-value layer values

d: Shielding thickness, with the half-value layer thickness of their units, people need to half-value layer thickness of the quality of translation into the thickness of the material, divided by the density of the material can be obtained.

For more details, you could visit: http://www.tungsten-alloy.com/tungsten-alloy-radiation-shielding.html.