Assume you have a radioactive spill of 9tc and you are measuring it using a large volume gm tube detector in the shape of a flat disc. you measure 1 counts per minute at a distance of 1 cm from the contaminated surfac a. what detection geometry will you assume for your calculation? b. what is your estimate of the counting efficiency of this geometry? c. what is the activity of the spill? d. if it was decided to leave it there without cleaning it off the surface, how long would it be before the activity was indistinguishable from background radiation of 25 counts per second (assuming it would be within 2 standard deviations of background)? how dangerous is this spill?

ι вєℓιєνє ιт ιѕ тнє fιяѕт ¢нσι¢є(α.)

нє ѕнσυℓ∂ ѕмιℓє ρσℓιтℓу αи∂ ѕρєαк тσ тнє ρєяѕσи ωнσ ιѕ ιитєяяυριиg αfтєя тнє ∂ιѕ¢υѕѕισи

нσρє ι ¢συℓ∂ нєℓρ.

an energy transformation flow diagram is shown

where is it ?

iron would move it is magnetic there is a mag field around the current in the wire

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.