GM Pancake Detectors (Halogen Quenched)

Description

Pancake detectors are widely used in nuclear probes and instruments for detecting and measuring alpha, beta or gamma surface contamination of clothes, small objects, benches, floors, roads, etc. Such halogen-quenched Geiger Mueller detectors are cost-effective, have an unmatched quality/cost ratio, are easy to use and are very reliable. Their ultra-thin mica window allows for an efficient detection of alpha, low energy beta and gamma radiation.

Adherence to stringent design parameters, manufacturing procedures and quality assurance provisions of CANBERRA products has successfully fulfilled commercial and military exacting standards. Our military approved detectors used by military customers worldwide, are able to withstand rigorous shock and vibration testing.

Our 2000-series of GM detectors provides a direct-replacement to most widely used competitive detectors. These can be incorporated into various radiation monitors and dosimeters. Our GM pancake detectors range in diameter from 33.5 mm (1.32 in.) to 53.6 mm (2.11 in.) and are also offered in Low Hysteresis and High Altitude models. These are used in CANBERRA's own line of products as well as products from various companies. Please contact us should you wish to discuss specific requirements or references.

Characteristics	Detector Type (for α, β, γ applications)
	T2000/8767** T2000/900 LH T2000/900 HA	T2000/500 T2000/500 LH T2000/500 HA	T2006/900 T2006/900 LH	T2006/500 T2006/500 LH	T2011/900	T2011/500
Applications	SBM-2D, SBS	BP-100	-	BP-77	MCB2, SABG-15	-
Sensitivity* 137Cs cpm at 1 mR/h*	3500	3500	3500	3500	1500	1500
Window Area Density (mg/cm2)	1.8- 2.0	1.8- 2.0	1.8- 2.2	1.8- 2.2	1.8-2.0	1.8-2.0
Window Effective Diameter (mm, in.)	44.5, 1.75	44.5, 1.75	44.5, 1.75	44.5, 1.75	28.4, 1.12	28.4, 1.12
Recommended Operating Voltage (HV+)	900	500	900	500	900	500
Plateau Length Volts min.	850-1000	450-600	850-1000	450-600	850-1000	450-600
Plateau Slope (%100 V max.)	10	10	10	10	5	5
Dead Time (µs max.)	50	50	50	50	40	40
Background (cpm) Shielding 2" Pb + 1/8" Al	30 max.	30 max.	30 max.	30 max.	18 max.	18 max.
Resistor Ra (MΩ)	3.3	3.3	3.3	3.3	3.3	3.3
Resistor R1 (MΩ)	1.0	1.0	1.0	1.0	1.0	1.0
Operating Temp. (°C)	–20 to +55	–20 to +55	–20 to +55	–20 to +55	–20 to +55	–20 to +55
Cathode Material	Cr/Fe	Cr/Fe	Cr/Fe	Cr/Fe	Cr/Fe	Cr/Fe
Max. Overall Length including Pins (mm, in.)	LH = Low Hysteresis Model HA = High Altitude Model				OPTIONS: FL = Flying Leads C = Push-on Anode Clip
Max. Overall Diameter (mm, in.)
Window Recess (mm, in.)	1.6, 0.062	1.6, 0.062	1.6, 0.062	1.6, 0.062	1.3, 0.05	1.3, 0.05
* At recommended operating voltage ** The only Mil. Spec. Pancake is the "jan 8767"

GM End Window Detectors

Description

Our GM End Window detectors provides direct-replacement to most widely used competitive detectors. These can be incorporated into various radiation monitors and dosimeters. Our GM End Window detectors are offered in two diameters: either 19.8 mm (0.78 in.) or 28.4 mm (1.12 in.). These are used in CANBERRA's own line of products as well as products from various companies. Please contact us should you wish to discuss specific requirements or references.

	Mica End Window (for α, β, γ Applications)
	Mil. Version 2121 M Window 2.8–3.4 mg/cm2		Probe contains 2131 tube. Available with BNC.
Characteristics	T2121	TP2121S	TP2131	TP2131/4P
Application	α, β, γ	α, β, γ	α, β, γ	α, β, γ
Sensitivity* 137Cs cpm at 1 mR/h*	1700	1700	2400	2400
Window Area Density (mg/cm2)	1.8 – 2.2	1.8 – 2.2	1.8 – 2.0	1.8 – 2.0
Window Effective Diameter (mm, in.)	19.8, 0.78	19.8, 0.78	28.4, 1.12	28.4, 1.12
Recommended Operating Voltage (HV+)	500	500	900	900
Plateau Length Volts min.	450 – 700	850 – 1000	850 – 1000	850 – 1000
Plateau Slope (%100 V max.)	5	5	10	10
Dead Time (µs max.)	100	100	150	150
Background (cpm) Shielding 2" Pb + 1/8" Al	30 max.	30 max.	40 max.	40 max.
Resistor Ra (MΩ)	3.3	1.0	1.0	1.0
Resistor R1 (MΩ)	1.0	1.0	1.0	1.0
Operating Temp. (°C)	–40 to +75	–40 to +75	–40 to +75	–40 to +75
Cathode Material	Cr/Fe	Cr/Fe	Cr/Fe	Cr/Fe
Max. Overall Length including Pins (mm, in.)	51.0, 2.0	94, 3.7	124, 4.85	115, 54
Max. Overall Diameter (mm, in.)	25.4, 1.0	82, 3.22	35 – 1.38	35, 1.38
Window Recess (mm, in.)	1.6, 0.062	1.6, 0.062	1.6, 0.062	1.3, 0.05
* At recommended operating voltage.

GM Gamma & Gamma/Beta Sensitive Detectors

Description

Our gamma and gamma/beta detectors are designed to handle harsh environments, and have a very long operating lifetime in excess of 5 x 10¹⁰ counts. These are offered in a wide range of lengths (51 mm to 351 mm) and diameters of (15.2 mm to 19.3 mm) and can be used as direct replacements for competitive detectors. These are widely used in radiological surveys and monitoring equipment as well as industrial and laboratory applications. Please contact us should you wish to discuss specific requirements or references.

Our beta sensitive detectors have a wall thickness of 40-60 mg/cm², (average 0.002"). They are used in many reactor safety monitoring systems and have proved to be very reliable even when used in semi-corrosive conditions at elevated temperatures.

	Thin Wall Detectors (for β, γ Applications)
	Flying lead connections available for these models. Indicated by "-FL" suffix on order
Characteristics	T2200	T2202	T2211
Application	β, γ	β, γ	β, γ
Sensitivity* 137Cs cpm at 1 mR/h*	5275	2900	1550
Window Area Density (mg/cm2)	N/A	N/A	N/A
Window Effective Diameter (mm, in.)	N/A	N/A	N/A
Recommended Operating Voltage (HV+)	900	900	900
Plateau Length Volts min.	850-1000	850-1000	850-1000
Plateau Slope (%100 V max.)	8	8	8
Dead Time (µs max.)	100	75	150
Background (cpm)*** Shielding 2" Pb + 1/8" Al	60 max.	30 max.	20 max.
Test Circuit	Figure 1	Figure 1	Figure 1
Resistor Ra (MΩ)	1.0	1.0	1.0
Resistor R1 (MΩ)	1.0	1.0	1.0
Operating Temp. (°C)	-40 to +75**	-40 to +75**	-40 to +75
Cathode Material	Cr/Fe	Cr/Fe	Cr/Fe
Cathode Wall	40-60 mg/cm2	40-60 mg/cm2	40-60 mg/cm2
Max. Length including Pins (mm, in.)	276, 10.9	148, 5.83	110, 4.31
Max. Overall Diameter (mm, in.)	16.0, 0.63	16.0, 0.63	19.3, 0.75
Window Recess (mm, in.)	N/A	N/A	N/A
* An exposure of 115.07 mR in air equates to 1.0 mGy. ** High temperature version available for 150 °C operation. *** At recommended operating voltage.

	Thick Wall Detectors (for γ Applications)
	Flying lead connections available for these models. Indicated by "-FL" suffix on order
Characteristics	T2306	T2311	T2314	T2316	T2350
Application	γ	γ	γ	γ	γ
Sensitivity* 137Cs cpm at 1 mR/h*	950	1850	3050	3950	8150
Window Area Density (mg/cm2)	N/A	N/A	N/A	N/A	N/A
Window Effective Diameter (mm, in.)	N/A	N/A	N/A	N/A	N/A
Recommended Operating Voltage (HV+)	900	900	900	900	900
Plateau Length Volts min.	850-950	850-950	850-1000	850-1000	850-1000
Plateau Slope (%100 V max.)	8	8	6	6	10
Dead Time (µs max.)	100	100	100	100	120
Background (cpm)*** Shielding 2" Pb + 1/8" Al	12 max.	30 max.	47 max.	60 max.	100 max.
Test Circuit	Figure 1	Figure 1	Figure 1	Figure 1	Figure 1
Resistor Ra (MΩ)	3.3	3.3	3.3	3.3	3.3
Resistor R1 (MΩ)	1.0	1.0	1.0	1.0	1.0
Operating Temp. (°C)	-40 to +75	-40 to +75	-40 to +75	-40 to +75	-40 to +75
Cathode Material	Cr/Fe	Cr/Fe	Cr/Fe	Cr/Fe	Cr/Fe
Cathode Wall	0.25, 0.010	0.25, 0.010	0.25, 0.010	0.25, 0.010	0.25, 0.010
Max. Length including Pins (mm, in.)	86, 3.4	119, 4.7	165, 6.5	197, 7.75	351, 13.82
Max. Overall Diameter (mm, in.)	16.0, 0.63	16.0, 0.63	16.0, 0.63	16.0, 0.63	19.3, 0.76
Window Recess (mm, in.)	N/A	N/A	N/A	N/A	N/A
* An exposure of 115.07 mR in air equates to 1.0 mGy. ** High temperature version available for 150 °C operation. *** At recommended operating voltage.

GM Miniature Detectors

Description

The range of our Miniature GM Detectors offers a wide choice of sensitivity levels available to meet our customer requirements. From low level background environments to levels up to 1000 R/hr. gives our customer the opportunity to select the ideal detector for their application.

Robust construction and the ability to withstand excessive shock and vibration as required for military applications, makes these detectors an ideal choice for small hand held pocket dosimeters and small portable health physics monitors. Please contact us should you wish to discuss specific requirements or references.

	Gamma Sensitive Miniature Detectors
	Anode pin connector and cathode strap are supplied. Stated wall thickness includes glass envelope and cathode wall where appropriate. To achieve maximum linear count rate, always solder Ra directly to the supplied anode pin connector, or to the anode flying lead.
Characteristics	T2411M	T2416A	T2417A	T2420M	T2422
Sensitivity*** 137Cs cpm at 1 mR/h*	84	420	450	4.2	0.66
Window Area Density (mg/cm2)	N/A	N/A	N/A	N/A	N/A
Window Effective Diameter (mm, in.)	N/A	N/A	N/A	N/A	N/A
Recommended Operating Voltage (HV+)	575	575	575	500	460
Plateau Length Volts min.	500–650	500–650	500-650	450–550	450–550
Plateau Slope (%100 V max.)	15	8	8	35	40 max.
Dead Time (µs max.)	15	45	45	20	10
Background (cpm) Shielding 2" Pb + 1/8" Al	2 max.	12 max.	5 max.	6 typ.	0.6 typ.
Test Circuit	Figure 2	Figure 2	Figure 2	Figure 2	Figure 2
Resistor Ra (MΩ)	2.2	4.7	4.7	4.7	4.7
Operating Temp. (°C)	–40 to +75	–40 to +75	–40 to +75	–51 to +71	–20 to +60
Cathode Material	Cr/Fe	Cr/Fe	Cr/Fe	Cr/Fe	Cr/Fe
Cathode Wall	80–100 mg/cm2	64–80 mg/cm2	64–80 mg/cm2	360–400 mg/cm2	360–400 mg/cm2
Max. Overall Length including Pins (mm, in.)	37, 1.46	51, 2.0	46, 1.82	20, 0.8	20, 0.8
Max. Overall Diameter (mm, in.)	6.2, 0.244	10, 0.4	9.20, 0.36	7, 0.28	7, 0.28
Window Recess (mm, in.)	N/A	N/A	N/A	N/A	N/A
* An exposure of 115.07 mR in air equates to 1.0 mGy. *** At recommended operating voltage. The T2422 detector is equivalent to the 3G10.

	Gamma Sensitive Miniature Detectors
	L – Max. Length without Leads D – Max. Overall Diameter
Characteristics	3G70/ EM14752 3G70	4G60M/ EM14754 4G60M	4G2500/ EM14749 4G2500	3G6500/ EM14748 3G6500
Sensitivity*** 137Cs cpm at 1 mR/h*	4.2	4.2	150	270
Window Area Density (mg/cm2)	N/A	N/A	N/A	N/A
Window Effective Diameter (mm, in.)	N/A	N/A	N/A	N/A
Recommended Operating Voltage (HV+)	460	500	550	460
Plateau Length Volts min.	420–500	450–550	500–600	420–500
Plateau Slope (%100 V max.)	30	30	25	25
Dead Time (µs max.)	25	25	35	50
Background (cpm) Shielding 2" Pb + 1/8" Al	0.6 max.	0.6 max.	6 max.	10 max.
Test Circuit	Figure 2	Figure 2	Figure 2	Figure 2
Resistor Ra (MΩ)	4.7	4.7	4.7	4.7
Operating Temp. (°C)	–20 to +60	–20 to +60	–20 to +60	–20 to +60
Cathode Material	Cr/Fe	Cr/Fe	Cr/Fe	Cr/Fe
Cathode Wall	360 mg/cm2	360 mg/cm2	260 mg/cm2	280 mg/cm2
Max. Overall Length including Pins (mm, in.)	34, 2.91	20, 2.36	34, 2.91	54, 3.7
Max. Overall Diameter (mm, in.)	7, 0.28	7, 0.28	7, 0.28	7, 0.28
Window Recess (mm, in.)	N/A	N/A	N/A	N/A
* An exposure of 115.07 mR in air equates to 1.0 mGy. *** At recommended operating voltage. The T2422 detector is equivalent to the 3G10.