Ludlum Measurements 182, Руководство пользователя

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Model 182 Radon Flask Counter
Ludlum Measurements, Inc. Page 1 June 2011
Introduction
he Model 182 Radon Flask Counter is a light-tight
sample box that uses scintillation techniques for the
detection of radiation material. It consists of a light-
tight cylindrical well, a two-inch photomultiplier tube (PMT)
optically coupled to a light pipe, and an automatic high voltage
ON-OFF switch. For sample counting, the radon flask is
placed on the acrylic light pipe. The upper tube body assembly
is fitted onto the lower tube base and held in place with two
thumbscrews. When the upper tube body is in place on the
lower base, a push-rod assembly automatically activates a
microswitch, allowing high voltage to be applied to the PMT.
When the upper tube assembly is removed, the HV is
automatically disconnected. This allows the cover to be
removed without turning off the high voltage on the
accompanying scaler/count-rate meter type instrument.
The Model 182 Switch Shield/Connector Box is constructed
for a Series C connector. The Series C connector uses a one-
wire system combining the HV and Signal. The HV is blocked
from the Signal part of the PMT by a capacitor located in the
tube socket. A terminal strip containing a filter circuit prevents
unwanted noise from the microswitch’s actuations.
Separate BNC signal and MHV high-voltage connectors can be
provided on the connector box.
Operation
Connect detector cable from Scaler/Counter to the Flask
Counter. Remove top cover from main body and place
T