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Re: [Phys-l] experimentation 101

Have you measured the radioactivity of dust? IIRC, an intro. exercise is to triboelectrically charge an inflated ballon at the beginning of a lab. period and near the end deflate it and measure the activity, which is noticeable. I measured the activity of a filter I used to clean the air from a window fan. Very active.

bc

On 2010, Jul 14, , at 13:22, ludwik kowalski wrote:

That is a tricky issue; on one hand this and on the other hand that. I am rejecting the outliers, blaming a possibility of migrating alpha radioactive contamination. My attempts to confirm this hypothesis were not successful.

Ludwik