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Can UVC light kill the viruses and bacteria?

時間:2020-04-21

For decades, scientists have been devoted to the research of UVC light for disinfection, especially when the UVC market is huge and the human pursuit of health is more important than ever before.


More and more reports indicate that UVC light products can kill viruses and bacteria higher than a 99.9% rate, which directly leads to the crazy purchase of UVC products.


But in fact, few people know exactly what UVC light is and whether UVC light is useful for sterilization.

次に詳しく説明します what UVC lights are, how they work, their precautions for use and some commercial applications あなたが明確な理解を得るために。


uvc light sterilization


Wha is UVC light?


誰もが知っているように、太陽光は異なる波長の光エネルギーの混合です。


380ナノメートル(nm)から780ナノメートル(nm)の範囲の波長は可視光と呼ばれ、波長の範囲を超える波長は不可視光と呼ばれます。

Ultraviolet light is a type of invisible light ranging from 10 nm to 400 nm. And the function of UV light depends on the range of wavelength.

  • UV-A:320 nm〜400 nm

It makes up the majority of UV light reaching the Earth. And it can damage our skin.

  • UV-B:280 nm〜320 nm

皮膚病の治療に使用されます。 しかし、過度の曝露は日焼けを引き起こし、さらには皮膚癌を引き起こします。 そして、UVBの2%未満しか地球に到達できません。

  • UV-C:200 nm〜280 nm

It is particularly good at sterilizing. But its penetration ability is very weak. Before reaching the ground, all UVC light will be absorbed by ozone in the atmosphere. That means, standing under the sun is useless for sterilization.

  • In summary: UV light Rule

波長が短いほど、エネルギーは強くなりますが、透過が弱くなるほど、消失は速くなります。


Function of UVC light

Related Knowledge: Which UV light is the best?

Because UVC light can be used for sterilization, coupled with the epidemic environment, the market demand for UVC products can be described as Crazy now.

そして、市場の評価額は140,000,000億500,000,000万ドルから推定XNUMX億ドルにまで増加しました。

The big question right now may be how does UVC light work and can it kill viruses & bacteria?


How does UVC light work?


Before the deep study of UVC light, I thought all sunlights have the sterilization effect. Bacteria and viruses will be killed by "sunburn" or heat.

But that's not the truth.


  • Sterilization Principle of UVC light


In fact, UVC light will destroy the DNA or RNA of the bacteria & viruses, without the use of chemicals, making them inactive and unable to reproduce.

Since the lifespan of single bacteria & viruses is very short, once they lose the reproduce ability, it means death. So the purpose of sterilization has been achieved.


In scientific research, it has been found that UVC light can use very little time to finish the disinfection process and make most microbes reduction up to 99.99%.


Research of UVC light

Based on this information, UVC light is believed to be quiet effective at killing viruses and bacteria.


However, the vitality of different viruses and bacteria are different. Some bacteria&viruses may be injured once they are exposed to UVC light, while others are not.


UV線量が不十分な場合、一部のウイルスは一時的に活動を失い、その後ゆっくりと自身の構造を修復します。


  • Special requirements of UVC lights

At present, there are no specific figures to show how much UV dose flu viruses needs to be killed. Maybe 1,085 mJ / cm2 or 3,640 mJ / cm2 . Anyway, a huge number.

You may be wondering if we stand under the sunlight containing UVC light, can we be disinfected by it?

Unfortunately, the answer is no. Although the sterilization ability of UVC light is extremely strong, the penetration ability to objects (including air) is extremely weak. Before reaching the ground, all UVC light will be filtered out by ozone in the atmosphere.

消毒を行うために紫外線消毒ランプと同様のキャリアを使用する必要があるのはこのためです。


Please pay attention to the fact that most UV lamps on the market are only designed to meet the common standard, that is, 40mJ / cm2 UV dose required for a 99.99% inactivation rate.


Study result of UVC light

Further considering the decay of UVC light in the air, those lamps make no sense for disinfection.

したがって、「ウイルスやバクテリアを殺すことができる」というある会社の発言を簡単に信じないでください。時々、それはマーケティング言語だけである場合があります。

効率、時間、コストだけが、UVランプの選択における重要な要素であることを認識しなければなりません。


Are ultraviolet lamps containing uvc light safe?


Although UVC light can indeed kill viruses and bacteria, there are various problems with household ultraviolet disinfection lamps on the market:

(1)従来の紫外線消毒ランプは大きく(少なくとも高さが40cm以上)、効率が低い。 1W LED光源は、基本的に1平方メートルのスペースしかカバーできません。


(2)ほとんどの紫外線消毒ランプの光源には水銀が含まれています。水銀は放出された場合、環境と健康に悪影響を及ぼします。

(3)ほとんどの紫外線消毒ランプはUVC、UVA、UVBを含む広域スペクトルのランプであり、オゾンを生成する可能性が高く、疲労、咳、胸部圧迫感、吐き気、記憶喪失などの症状を引き起こします。


Applications of UVC light

From this perspective, the main application scenarios of UVC light should be industrial types to maintain safe.


Applications of uvc light


To make better use of UVC light, we have developed a new lighting technology, which can make the UVC energy in a very small size with 3.5mm x 3.5mm without mercury.


このサイズで、消毒機能を備えた多くのポータブル機器に適用できます。

(1)表面


病室や設備、居間、空港、ほとんどすべての公共の場所や私物などの汚染された表面。


(2)水


Mercury-free UVC light is a clean and safe water disinfectant, UVC LED based solutions tackle these pathogens without impacting the water's smell, taste or mineral contents.

UVCソリューションは浄水システムやトイレシステムで使用できます。


(3)空気


空気清浄機は浮遊粒子の99.97%を除去しますが、フィルターはインフルエンザのような小さな病原性微生物を除去しません。

UVCソリューションは、空気清浄システムまたは商用空調ダクトシステムで使用できます。


How to use UVC light

All in all, UVC light can indeed kill viruses and bacterial if we choose the right system for specific applications.


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