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<p>Ultraviolet sterilization is a traditional and effective disinfection method, which has been widely used in hospitals, schools, food factories, water treatment, etc., but it is affected by many factors in the use process, especially the low radiation intensity of the lamp and improper application will affect the disinfection and sterilization effect. In order to ensure satisfactory disinfection effect, we mainly implement the following monitoring and management measures in use.</p><p><br></p><p>1. Radiation intensity of <a href="https://www.tnuvir.com/uv-lamp" rel="noopener noreferrer" target="_blank"><strong><a href="https://www.tnuvir.com/uv-lamp" target="_blank">ultraviolet sterilization lamp</a></strong></a> tube:</p><p><br></p><p>Ultraviolet radiation intensity is the most basic factor that affects disinfection effect, according to "technical specification of disinfection" the requirement that sets, radiation intensity of new ultraviolet sterilization lamp should be greater than 100 W/cm2(distance 1m place) it is qualified, the lamp in use radiate intensity lowest should reach 70 W/cm2 temporarily can be used, but must extend illuminate time. According to the formula that the ultraviolet radiation dose is equal to the radiation intensity times the irradiation time, the prolonged irradiation time for different intensification can be calculated. If the intensity of ultraviolet light source is less than 40VW/cm2, then the extension of irradiation time can not play a satisfactory sterilization effect, that is, should stop using. Do not think ultraviolet sterilization lamp tube should be on only, still have antiseptic action.</p><p><br></p><p>2. Number of lamp tube installation</p><p><br></p><p>According to the ministry of health issued "technical standard for disinfection, third edition, volume 2 (hospital disinfection) norms, indoor pendant ultraviolet sterilization lamp installation quantity (30 W ultraviolet light, radiation intensity in vertical 1 m higher than 70 mu W/cm2) for the average per cubic meter of not less than 1.5 W, and uniform distribution, hoisting height from the ground 1.8-2.2 m, makes the human breathing zone at available irradiation range. Continuous irradiation of no less than 30min, the ultraviolet radiation intensity and the radiation distance are inversely proportional, the suspension is too high, affecting the sterilization effect. If it is the object surface disinfection, the ultraviolet sterilization lamp tube from the irradiation surface should be 1m as appropriate, sterilization is effective.</p><p><br></p><p>3. Ambient temperature</p><p><br></p><p>Ambient temperature has a certain impact on the intensity of ultraviolet radiation, the temperature is too high or too low will make the radiation intensity reduced, such as the temperature dropped to 4℃, the radiation intensity can be reduced by 65% ~ 80%, seriously affect the bactericidal effect. Generally 20 ~ 40℃ room temperature is the appropriate temperature for ultraviolet disinfection, in this temperature range of ultraviolet radiation intensity is the largest and stable, can achieve the ideal disinfection effect</p><p><br></p><p>4. Relative humidity</p><p><br></p><p>With high relative humidity, less uv radiation penetrates cells. Relevant literature introduces, when relative humidity is in 55% ~ 60%, ultraviolet ray kills the rate of the microorganism strongest, when relative humidity is in 60% ~ 70% above, the microorganism sensitive rate to ultraviolet ray reduces, relative humidity is in 80% above even has the activation effect to the microorganism instead, can make the bactericidal force reduces 30% ~ 40%. Just wet mop the ground and wipe desktop immediately after ultraviolet disinfection, can make indoor humidity increases, affect disinfection effect. Accordingly, when using ultraviolet ray disinfection indoor should keep clean, dry.</p><p><br></p><p>Protect against uv radiation damage</p><p><br></p><p>Main prevent ultraviolet ray to the eye, the skin of the face exposure radiation injury, do not look directly at the lamp tube to prevent cause conjunctivitis. Do not make ultraviolet ray illuminant irradiate directly to the person, lest the skin produces erythema. Ultraviolet radiation can release ozone. Excessive ozone can be toxic to people. The concentration of ozone should not exceed 0.3mg/m3 in a manned working environment. Should be in the room under the condition of unmanned ultraviolet radiation. When monitoring the radiation intensity, a special radiation intensity detection tool ruler is used to observe the light source with the back. Ordinary glass or sunglasses can also be used as a protective mask to protect the eyes and facial skin.</p><p><br></p><p>6. Clean the lamp tube regularly</p><p><br></p><p>The dust of ultraviolet sterilization lamp tube surface and oily dirty, can hinder ultraviolet ray to penetrate, the wipe that should notice lamp tube in use and keep clean, before new lamp tube is used, can use cotton ball of 75% alcohol to wipe first. Use in the process of general every 2 weeks wipe once. When discovering lamp tube surface has dirt, grease, answer to wipe at any time, maintain the cleanness of lamp tube and transparent, lest affect the penetration of ultraviolet ray and radiation intensity.</p><p><br></p><p>7. Strengthen the monitoring of the radiation intensity of ultraviolet sterilization lamp tube</p><p><br></p><p>The ultraviolet sterilization lamp in use should 3 ~ 6 months make an intensity examination with ultraviolet ray illuminance instrument, the lamp tube that discovers intensity unqualified should be replaced in time. Calibration is made annually with an ultraviolet ray illuminometer to maintain accuracy. When monitoring, it must be in accordance with the measurement conditions in the technical specification for disinfection, the voltage is 220V, the temperature is above 20℃, the relative humidity is less than 60%, the stable intensity after 5min of turning on the lamp is the radiation intensity of the ultraviolet sterilization lamp. Also can use ultraviolet radiation intensity chemistry to indicate a card to measure, will indicate card to be apart from lamp tube 1m place irradiate 1min, photosensitive coating turns purple red by white, compare with standard color piece, can know lamp tube radiate intensity, knew the use of ultraviolet sterilization lamp and test method.</p>
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