The criteria that I have established for selecting proper instrumentation is as follows:

1. is not prohibitively expensive

2. is not overly complicated and directed towards scientific uses

3. is not difficult to maintain and calibrate

4. is not too simplistic so that it will give us a meaningful scale

5. is not too limited in its scale so that it may not respond to the high ranges about which we are speculating as to occurriing

6. is hardened so that will not be damaged by those high ranges

7. is not overly delicate so that we can use it in the hazardous situation that we anticipate

8. ideally the equipment would be either EMP hardened or not EMP sensitive, however there are other solutions for dealing with EMP.

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Professional equipment is too expensive for my pocket book (between two thousand and fifteen thousand dollars) and is often too complicated to use.

There are two pieces of equipment that help measure UVR--one on the rooftop and one in the building. The broadband detector, which is placed on the rooftop, is a UV light meter with a quartz dome. First, sunlight passes through the dome, strikes a black filter called a solar blind filter, and visible light is filtered out. Next, UV light illuminates phosphor beneath the filter. (The phosphor represents skin's reaction to UV radiation.)

After that, a photo-cell converts UV light to an electrical impulse, which travels along a cable to a recorder inside the building. Then, the recorder measures UV intensity as minimal erythema dose (MED). ( MED represents how long it takes the skin to begin burning, and erythema is the reddening of the skin caused by the dilation of blood vessels.) Finally, MED is recorded as a numeric value on a scale from one to 10+.

You might try to build your own -
but I have never done it
and don't know of anyone else who has either.

Nevertheless, here are some directions -
but I really doubt that this will work out.

You can see the difference between inside and outside
BUT -
I have no idea how one would calibrate them.

I don't know how many you will get for $11.95 but it will probably be a bunch.

You could have a problem if, as another supplier says, they are subject to Hazardous Materials surcharge and require special packaging and/or must be shipped by motor freight.

Check them out at:

A simple, reusable, credit card size device that indicates the ultraviolet light intensity.

The UV Card measures the strength of UV light (in about 20 seconds).

Good price - but I don't know -

* how durable it is
* whether it detects at high enough range
* what the scale is

South Seas Trading Company

Dose: 0 � 99 MED

Accuracy: 15% (3 � 15UVI); 20% (0 � 3UVI)

Basic Mode: Erythemal UV Intensity, Erythemal UV Daily Dose

Dimensions: 4.6� x 2.0� x 0.9� (115 x 51 x 23 mm)

Weight: 5 ounces (140 g.), with batteries.

Operation time:

(hours) switched on 900

(hours) switched off 1800 (standby mode)

Operation humidity: 0 � 95%, non condensing

Construction: ABS plastic

Battery Type: two CR2430 lithium batteries (equivalents: DL2430, 5011LC)

I am told that the batteries are readily available at places like Radio Shack
and one would want to stock a bunch of them - looking at those usage times.

The other thing is that I need to check out further
is the correlation between the scales and our charts and needs.

I think we could get these for about $100 each
as a group buy.
That would include delivery to the individual members.