Dear forum members,(adsbygoogle = window.adsbygoogle || []).push({});

I would like to ask some help regarding irradiance calculation. I am a high school student doing a project in biology in which I expose drosophila m. (fruit flies) to UVA radiation and I would like to mention in my paper the actual dose that was used.

I know that... UV dose (J/m^2) = W/m^2 x s

W/m^2 refers to irradiance, this is the formula that I found for calculating it:

E= dΦ / d Ad

1. Ad is the area which is exposed to the radiation.

What does the d in front of Ad stand for?

dΦ = E0 cosθ d Ad

So, the formula above is the radiation intensity (W)...

2. E0 is the irradiance of light incident upon material, how do I calculate that?

From here I found the information: http://metrology.hut.fi/courses/S-108.4110/2007/RADIOMETRIA.pdf (on the 5th page)

Lamp:

Original Philips UVA

Type HP3147/A

220V ~ 50 Hz 75W

Thank you for any advice and help!

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# UV and irradiance

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