| Show Enamel Enamel Coated Coated Tin Cans Play Part in Atom Role In experimenting with radioactive chemicals from the atomic piles plIes at Oak Ridge plant scientists of the U. U S S. S department of agriculture have stopped using the familiar amUlar clay pots and Jars in their greenhouse experiments Instead they are using inexpensive tin cans coated with enamel After each experiment they discard the cans and soil soU that contains contains contains con con- the radioactive material and bury them deep in hi the ground to get rid of them The reason is simple In checking the action of th the radioactive chemicals chemicals chemi chemi- cals Gals moving out of the soil and into and ami through the plant the scientists make use of the deli delicate ate tracer method Counting instruments detect detect de de- de- de teet and record the passage ol of charged molecules as they pass through the plant tissues It Is necessary necessary necessary essary to have exact knowledge as asto asto asto to the radiant energy present at the start of the experiment This Is possible pos pOSe sible by using fresh soil solI a new container container con con- tamer and exactly measured quantities quan quan- titles of radioactive chemicals But if a clay container had been used previously the pot would have become at least slightly radioactive tive and so would add some unmeasured unmeasured un measured radioactive energy that would complicate the experiment It If would disturb rb what the scientists term the control af conditions condition i- i f 1 |
