Light Yield and Noise Measurements

The crystals tested consisted of small cylindrical pieces and two full-sized blocks, the dimensions of which are listed in Table 5.1. The crystals were wrapped in many layers of 75 pm thick teflon film, using up to 24 (17) layers for small (large) crystals. In some of the measurements, we preserved an air gap between the wrapping and the crystal by insertion of thin clear plastic netting with a 1 cm x 1 cm mesh. 

stal Dimensions (cm) shaping ( /tSCc) Readoiit Device 7511 (%) 1275 (%) 

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Table 5.2, Light yield and noise measurements with small and large CsI(Tl) crystal read out with an APD, yin is the initial photoelectron yield, Yout is the output electron yield from the APD, and ENC is the equivalent noise charge.

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