( ( ( ( They ( ( are then ) heated ) ) and ) ( ( ( luminescence proportional ) ( to ( ( the ( total doses ) ) ( received ( during ( several ( read cycles ) ) ) ) ) ) ) ( is produced ) ) ) . )
(ROOT (S (S (NP (PRP They)) (VP (VBP are) (ADVP (RB then)) (ADJP (JJ heated)))) (CC and) (S (NP (NP (JJ luminescence) (NNS proportional)) (PP (TO to) (NP (NP (DT the) (JJ total) (NNS doses)) (VP (VBN received) (PP (IN during) (NP (JJ several) (VBN read) (NNS cycles))))))) (VP (VBZ is) (VP (VBN produced)))) (. .)))
They are then heated and luminescence proportional to the total doses received during several read cycles is produced.
(ROOT (S (NP (NP (NNP Producing) (NN light)) (PP (IN without) (NP (NN heat)))) (VP (VBZ is) (VP (VBN called) (S (ADJP (JJ luminescence))))) (. .)))