Simplify the following text for a Grade 11 native English-speaking person.
Original: Counting efficiencies under ideal conditions range from about 30 % for tritium ( a low-energy beta emitter ) to nearly 100 % for phosphorus-32 , a high-energy beta emitter .
Simplified: Counting efficiencies under ideal conditions is about 30 % for tritium . Tritium is a low-energy beta emitter .