• Create Account

Submit your paper to J Biol Methods today!

# How do I calculate the enery absorved by cells form a UV light

UV light UV lamp

3 replies to this topic

### #1 BioPe

BioPe

member

• Active Members
• 19 posts
0
Neutral

Posted 14 January 2014 - 12:38 PM

Hey all

I am doing some rough experiments irradiating cells with a UV lamp.

I know this is not exactçy the most scientific way to do it, but please bear with me.

How do I calculate the energy (Joules) absorbed by cells?

I suppose I can do this calculation as long as I know the type of lamp (UVC light, I know the wave lenght), the distance of the light source to the cells and the time period the lamp remains on.

Thanks in advance for any help guys.

Cheers,

BioPe.

### #2 hobglobin

hobglobin

Growing old is mandatory, growing up is optional...

• Global Moderators
• 5,598 posts
116
Excellent

Posted 14 January 2014 - 12:58 PM

Not sure if I'm completely wrong but IMO you have to measure the light "amount" which arrives on the cells, there are sensors which e.g. measure watts per square meter or micromoles (μmol) per squaremeter (m-2) per second (s-1) (depends on sensor type).

From this you can calculate joules then using some relationships which are here: http://5e.plantphys....php?ch=t&id=131

The problem might be how to get the absorbance finally which might be different from emitted radition.

One must presume that long and short arguments contribute to the same end. - Epicurus
...except casandra's that did belong to the funniest, most interesting and imaginative (or over-imaginative?) ones, I suppose.

### #3 bob1

bob1

Thelymitra pulchella

• Global Moderators
• 6,282 posts
494
Excellent

Posted 14 January 2014 - 03:05 PM

hobgoblin is right, you need to know the power output of the bulb.

If you have access to one, a UV crosslinker (e.g. Stratalinker) usually has this information provided and can time for exact amounts of exposure.

### #4 Borek

Borek

member

• Active Members
• 13 posts
0
Neutral

Posted 31 January 2014 - 02:08 PM

If you need absorbed energy you need to account for the reflected/passed through radiation.