太陽光模擬器的用于光毒性實(shí)驗(yàn)
紫外線是與人體皮膚密切相關(guān)的一種重要的環(huán)境因素,根據(jù)波長(zhǎng)不同,紫外線可分為長(zhǎng)波紫外線(UVA,320-400nm)、中波紫外線(UVB,280-320nm)和短波紫外線(UVC,200-280nm)。能夠到達(dá)地球表面的紫外線僅包括UVA和UVB,與UVA相比,同等劑量的UVB對(duì)皮膚的損傷強(qiáng)度是UVA的1000倍左右。紫外線照射皮膚細(xì)胞產(chǎn)生大量活性氧自由基,這些活性氧自由基與引起細(xì)胞凋亡密不可分。
實(shí)驗(yàn)流程操作注意事項(xiàng):
新的金屬鹵化物紫外線燈管應(yīng)在使用前點(diǎn)亮約100小時(shí),以獲得穩(wěn)定的輻照強(qiáng)度。
根據(jù)Hoenle博士的說法,紫外線燈管的壽命時(shí)間(光譜穩(wěn)定)至少為800小時(shí)。因此,建議記錄太陽光模擬器的使用時(shí)間。只有在測(cè)試發(fā)射的紫外線輻照強(qiáng)度滿足的情況下,才允許延長(zhǎng)使用。
1、將配備H1濾光片的SOL 500/SOL 3太陽光模擬器安裝在適當(dāng)?shù)姆€(wěn)定支架上,以便微調(diào)照射距離。
2、將SOL 500/SOL 3太陽光模擬器調(diào)節(jié)到輻照距離約60厘米左右。
3、打開太陽光模擬器開關(guān),等待至少15分鐘,使用經(jīng)過校準(zhǔn)的UVA紫外輻射計(jì)測(cè)量通過細(xì)胞培養(yǎng)板蓋的紫外線輻照度。
4、調(diào)整SOL 500/SOL 3太陽光模擬器的距離,使UVA輻照度達(dá)到1.7 mW/cm2(每10分鐘輻照時(shí)間產(chǎn)生的劑量為1 J/cm2)
5、根據(jù)同時(shí)輻照的板數(shù),檢查輻照區(qū)域輻照度分布是否均勻:可接受1.6-1.8 mW/cm2的范圍。
重要提示:如果在達(dá)到半個(gè)輻照時(shí)間(30分鐘)后(如chess Castleing),改變低輻照度和高輻照度板的位置,則可接受1.5和1.9 mW/cm2的大差值。
每次進(jìn)行光毒性試驗(yàn)前,應(yīng)按照前面步驟檢查SOL 500/SOL 3太陽光模擬器的輻照值。如果使用UV輻射計(jì)進(jìn)行的測(cè)量結(jié)果低于規(guī)定值,則紫外線燈管可能已達(dá)到其壽命,或者輻射計(jì)由于各種原因造成測(cè)量偏差。在這種情況下,應(yīng)使用第二臺(tái)相同類型和校準(zhǔn)過的紫外輻射計(jì)進(jìn)行交叉檢查,該參考輻射計(jì)未每天進(jìn)行處理,且應(yīng)保持在黑暗中。
德國(guó)Dr. Hoenle AG好樂集團(tuán)成立于1976年,總公司為HONLE GROUP,是先進(jìn)的紫外工業(yè)的供應(yīng)商之一。作為紫外專家,開發(fā),制造和分銷各地的紫外線系統(tǒng),紫外線燈和紫外線測(cè)量設(shè)備。這套系統(tǒng)被用在交叉反應(yīng)活性物質(zhì),表滅shajun以及太陽模擬。HONLE(HOENLE)產(chǎn)品在電子、微電子、精密工程和光學(xué)工業(yè)生產(chǎn)過程中使用,在印刷,汽車,航空和醫(yī)藥等領(lǐng)域的也有廣泛應(yīng)用。
Calibration of the Solar Simulator
Note: New metal halide burners should be burned for ~100 hrs prior to first use to achieve a stable emittance.
According to Dr Hoenle the burner has a shelflife (in which the spectrum is stable) of at least 800 hrs. Recording of lamp usage hours is, therefore, recommended. Extended use is only acceptable if the emitted energy spectrum can be checked.
1. Mount the SOL 500 / SOL 3 lamp, equipped with a H1-filter, on any appropriate stable tripod allowing fine-adjustment of the exposure distance.
2. Adjust SOL 500 / SOL 3 to a distance of about 60 cm.
3. Switch the Lamp on, wait at least 15 minutes and measure irradiance through the lid of a cell culture plate using the calibrated UV radiometer (type 37, Dr. H?nle), equipped with an UVA-sensor of the same serial number
.
4. Adjust distance of SOL 500 / SOL 3 to achieve a UVA irradiance of 1.7 mW/cm2 (The resulting dose will be 1 J/cm2 per 10 min. exposure time)
5. According to the number of plates to be exposed concurrently, check the exposure area for equal distribution of irradiance:
A range of 1.6 - 1.8 mW/cm2 is acceptable.
Important: A maximum difference of 1.5 and 1.9 mW/cm2 can be accepted, if positions of the plates with low and high irradiance are changed after half time of the irradiation (30 minutes) is reached (like chess castling).
Calibration of the SOL 500 / SOL 3 shall be checked as described above each time before performing a phototoxicity assay. In case measurements with the UV radiometer reveal unexpected results, either the metal halide burner may have reached the end of it's shelflife, or the radiometer is de-calibrated due to various reasons. In this case, a second reference radiometer of the same type and calibration, which is has not been handled every day and kept in the dark shall be used for cross check.
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