I don't think so, I haven't been able to find any.

while in teh game type "cash" without the qoutes and you gain 1000 cash

Most types of radioactive decay cannot be affected by anything. However, radioactive decay involving electron capture will be affected by the removal of electrons from around the nucleus. In the absence of orbital electrons, it cannot occur at all.

Explorer 1 entered orbital decay [See related link] on March 31, 1970

This isn't a straight forward math question. A satellite in orbit at a height of 173 miles and is experiencing orbital decay of 1640 feet a day will eventually come into contact with the upper atmosphere. Atmospheric drag will begin to affect the orbital decay rate, and it will increase. It will not be long before atmospheric drag, which will be heating the satellite, offers so much resistance that the satellite will be burning up and will be slowing down extremely rapidly. It's orbital decay will not be a linear thing as suggested by the problem posed. Only for a while at the start will its decay rate remain constant.