ZING!

crocoite · Post by **crocoite** » Wed Oct 11, 2006 12:56 am

click...click...click...click...click...click...click...click...click...click...

Another UV fluorescent shot - only this time it would send a Geiger off!

The mineral is saleeite from Lake Boga in Victoria. In the hand specimen (second photo), it appears as dull yellow plates a few mm across. But under a UV light source (in this case longwave again) it is an intense luminous green. Whole specimen is 90mm across. I got my wife to hold the specimen for the UV shot, and she was fine until I told her afterwards that it is radioactive

beetleman · Post by **beetleman** » Wed Oct 11, 2006 3:37 am

Nobody likes the word "radioactive" but their is natural radiation all around us

When you take these UV shots, are you just taking standard photo shots or do you have to do time Exposures (leave the shutter open for a few seconds)? Very interesting shots Steve....thank your wife for us for her support

Ken Ramos · Post by **Ken Ramos** » Wed Oct 11, 2006 4:25 am

Interesting photos Steve. Have you been able to measure the amount of radiation emminating from this sample? I would assume it to be extemely low and not dangerous but I am a bit curious.

crocoite · Post by **crocoite** » Wed Oct 11, 2006 5:00 am

beetleman wrote:When you take these UV shots, are you just taking standard photo shots or do you have to do time Exposures (leave the shutter open for a few seconds)?

Hi Doug

I had to set the exposure manually (I set it to 5). The auto exposure was saying 1 second but this was far too long.

crocoite · Post by **crocoite** » Wed Oct 11, 2006 5:07 am

Ken Ramos wrote:Interesting photos Steve. Have you been able to measure the amount of radiation emminating from this sample? I would assume it to be extemely low and not dangerous but I am a bit curious.

Hi Ken

I'm not aware of what the likely reading would be as I don't have ready access to a Geiger Counter, but it certainly would crackle. These types of mineral specimens are safe enough though. You'd need an awful lot tfor it to be a health hazard - fortunately!

Cyclops · Post by **Cyclops** » Wed Oct 11, 2006 5:34 am

crocoite wrote:

I had to set the exposure manually (I set it to 5). The auto exposure was saying 1 second but this was far too long.

So is that 1/5th of a second?What camera system are you uisng? Doesnt sound like 35mm.

Carl_Constantine · Post by **Carl_Constantine** » Wed Oct 11, 2006 8:08 am

Looks like kryptonite in the dark ;-)

crocoite · Post by **crocoite** » Thu Oct 12, 2006 2:36 am

Cyclops wrote: So is that 1/5th of a second?What camera system are you uisng? Doesnt sound like 35mm.

Sony DSC-F828 8 Megapixel Cybershot, and yes 1/5th