d4l3k / sanitizer

sanitizer

Building a box lined with aluminum foil and mounting this in the top of the box is probably the best way to disinfect things quickly.

UVC Leds Power by distance away

For a half sphere falloff:

• $36 mW /(4 pi * (32 cm)^2/2) * 15*60 seconds = 5 mJ/cm^2$
• $36 mW /(4 pi * (100 cm)^2/2) * 2.56060 seconds = 5.157mJ/cm^2$
• $36 mW /(4 pi * (200 cm)^2/2) * 106060 seconds = 5.157mJ/cm^2$

Power to kill SARS-CoV-2

power	1.25 mJ/cm^2	2.5 mJ/cm^2	3.75 mJ/cm^2	5 mJ/cm2
time at 1.25 mW/cm^2	1 second	2 seconds	3 seconds	4 seconds
260 nm				2.6
268 nm	0.7	1.2	1.5	2.8
270 nm				2.8

from https://www.klaran.com/crystal-is-and-boston-university-research-demonstrate-klaran-uvc-leds-effective-wavelength-for-inactivating-sars-cov-2

Aluminum foil reflectivity

Aluminum foil has a reflectivity of 73% for UVC light.

https://www.klaran.com/images/kb/application-notes/Using-UV-Reflective-Materials-to-Maximize-Disinfection---Application-Note---AN011.pdf