<Half life of the stock> 1 X 10^6 millirads per thermodyne. Teacher: Hermann! Herman Geiger! What are you doing at the back of the class mumbling to yourself and wiggling your fingers! Hermann! Herman: Sorry, teacher but you made me lose count! Teacher: You and Muller are the worst reprobates. Always with the taking off the shoes! What is that all about? Muller: Hermann said he could out-count me and I won't let that happen! EC<:-}