Ronan X96S LEVEL GAGE Manuel d'utilisateur télécharger pdf (Page 40)

Detector

Scintillator Detector

Description The Ronan scintillation detector consists of three main components: The

plastic scintillation n crystal, the photomultiplier tube (PMT), and the

associated electronics.

Scintillation Crystal The crystal used for the Continuous Level Monitor System is poly vinyl

toluene (PVT) plastic. The crystal produces light pulses which are

proportional to the incident radiation events striking it.

Typically mounted in a stainless steel shell the entire crystal assembly is

sealed against moisture and dirt and is non-repairable. An integral flange

serves to mount the crystal to the PMT. A special silicone membrane

serves as an optical coupling medium between the crystal and the PMT.

Photomultiplier Tube The PMT is a light sensitive vacuum tube with a photosensitive layer that

converts the light pulses to an electrical current. Light pulses from the

crystal strike the photosensitive layer and release electrons. A high voltage

power supply connected to the photosensitive layer accelerates the

electrons through stages of current amplification.

The PMT and its associated components are housed in a special magnetic

shield. The tube is shock-mounted internally, with an interface plate at the

top, which also mounts the electronics and the outer shell.

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Electronics Four boards, housed in a stainless steel shell, comprise the electronics and

their functions.

• High Voltage Power Supply

• Preamplifier

• Discriminator

• Pulse Output

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Ronan X96S LEVEL GAGE Manuel d'utilisateur Page 40