Alpha/Beta Monitor - Model 177-84
Introduction

The Model 177-84 is a microprocessor based radiation survey instrument used to measure and discriminate low level alpha/beta radiation when used with an alpha/beta scintillation or proportional detector. The instrument has automatic background subtract and automatic background update. It also has an adjustable count timer which can be set from 0 to 120 seconds. An external switch must be connected to the instrument to initiate a count.

The radiation level is displayed on two analog meters. The Alpha meter dial indicates 0-1000 CPM on a three decade log scale. The Beta meter dial indicates 100 to 100,000 CPM on a three decade log scale. Each channel has its own distinguishable click per event audible tone. Beta events are a low pitch and alpha events are a high pitch. Beta clicks per event can be set at 1 per 1, 10, 100, or 1000. Each channel has its own alarmpoint which is adjustable from 0 to full scale. Alarms are indicated by an audible tone and LED’s (Light Emitting Diodes).
 

Model 177 Series

Model 177: supports GM and scintillation detectors, linear analog meter, 4-decade range, 0 to 500,000 cpm (other dials available), adjustable audible & visual alarm (Part Number 48-1632)
Model 177-50: supports GM, scintillation, and proportional detectors, logarithmic meter, 5-decade range, 10 to 1,000,000 cpm (other dials available), adjustable audible & visual alarm (Part Number 48-1202)
Model 177-61: supports GM, scintillation, and proportional detectors, linear analog, 4-decade range, 0 to 500,000 cpm (other dials available), adjustable audible & visual alarm (Part Number 48-1382)
Model 177-84: supports scintillation and proportional detectors, dual analog 3-decade meters (alpha range 0 to 1000 cpm, beta range 0 to 100,000 cpm), independent adjustable audible & visual alarms (Part Number 48-2727)