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Radiation Detection

Ludlum Radiation Devices

Nuclear Radiation Detection
(This page is not intended for small screens.)
This page is NOT associated with Ludlum Instruments, Inc.
by Vaughn Aubuchon

Below, I present a nuclear radiation detection information guide. I am not a nuclear engineer. Some data may be incorrect.
.

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ON-PAGE

4. Ludlum Radiation Product Summary
    - detection devices and probes
       1.
Nuclear Radiation Detection Devices

       2. Nuclear Radiation Detection Probes

       3. Disclaimer
.

OFF-PAGE

1. Nuclear Radiation Detection Summary
    - for general information

2. Geiger Counters Summary
    - for descriptions and pricing

3. Geiger Counter Data Compared
    - for sensitivity comparisons

4.

5.
Victoreen CDV-700 6B Detector Summary
    - True Geiger Counter

6. Victoreen CDV-715 1A Detector Summary
    - Ion chamber detector

7. Victoreen CD V-750 5B Dosimeter Charger
    - Charges CD dosimeters

8. Uranium Ore Summary
    - common types of radioactive ore

.



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     1. Ludlum Radiation Detection
         Meters/ Devices - Definitions

.
     Type of Device

Description

Model
Number

Features

Meter
Faces
Oct.
2010
Price

.
     1. Geiger Counter without Readout

-

May produce audio
May show green light
May flash red light

-

-

Self-contained - Requires no external probe
May use a semiconductor detector
May use a Geiger-Mueller detector
Provides an audio/ visual indication of detected radiation - usually beta and gamma

.
     Geiger Counter with Readout
     and Internal Probe

Model 5 (gama)

Model 6 (gamma)

Radiography Ratemeter (5 ranges)
- - - - - 2 internal EC GM tubes

Radiography Ratemeter (3 ranges - gamma)
- - - - - 1 internal EC GM tube

3


3

$ 1,105


$ 1,056

Self-contained - Requires no external probe
Averages the numbers of events, and provides a meter showing Counts per Minute (CPM) and/ or mR per hour.

.
     2. Survey Meter
         (General Purpose Portable Meters)

Model 2
Model 3
Model 3A

Model 12

Model 14C

Model 16
Model 18

G.P Ratemeter (3 ranges)
G.P. Ratemeter
(4 ranges)
G.P. Ratemeter (4 ranges) with alarm

G.P. Ratemeter (4 ranges) HV Button

G.P. Ratemeter (5 ranges) Int. Det. + Ext.

G.P. Ratemeter (4 ranges) Prog. Win.
G.P. Ratemeter (4 ranges) 3 Detectors

-
18
18

4

11

1
4

$ xxx
$ 532

$ 853

$ 825

$ 735

$ 1,180
$ 1,231

Requires an external probe
A probe may be selected for alpha, beta and/ or gamma radiation - the increments on the meter face are based upon the probe it is used with.
Select a probe from the table below.

Model 2401
Model 2402
Model 2403

Pocket-size Ratemeter
Pocket-size Ratemeter (3 ranges)
Pocket-size Ratemeter (4 ranges)

1
1
1

$ ???
$ 630
$ 655

Mod. 2401-EC
Mo. 2401-ECA
Mod. 2401-EW
Mo. 2401-EWA
Mod. 2401-P
Mod. 2401-S

Pocket-size Ratemeter, (3 range, en. com.)
Pocket-size Ratemeter, (3 range, en. com.)
Pocket-size Ratemeter, (3 range, end win.)
Pocket-size Ratemeter, (3 range, end win.)
Pocket-size Ratemeter, (3 range, pancake)
Pocket-size Ratemeter, (3 range, scintillator)

1
1
1
1
1
1

$ 489
$ 554
$ 495
$ 575
$ 550
$ 1,485

Internal probe

.
     MicroR Ratemeters

-

Model 19
Model 19A
Model 192
Model 193

MicroR/ Ratemeter - Int. 1x1 NaI detector
MicroR/ Ratemeter - Alarm, log scale
MicroR/ Ratemeter - Int. 2x1 NaI detector
MicroR/ Ratemeter - Ext. Scintillator

4
3
1
1

$ 1,371
$ 1,425
$ 1,987
$ 1,129

Micro REM meters
High sensitivity to low levels of gamma radiation

.
     3. Ratemeter/ Scaler

-

Model 2221

Model 2224-1

Model 2241
Model 2241-1
Model 2241-2
Model 2241-3

Scaler/Ratemeter, SCA (everything)(6 D)

Alpha/Beta Scaler/Ratemeter (4 ranges)

Digital Scaler/ Ratemeter, autorange (6 D)
Digital Scaler/ Ratemeter, (4 ranges)
Digital Scaler/ Ratemeter, autorange (2 D)
Digital Scaler/ Ratemeter, autorange (4 D)

7

1

1
-
1
1

$ 2,570

$ 1,801

$ 1,070
$ ?.???
$ 1,090
$ 1,285

Requires an external probe
A probe may be selected for alpha, beta and/ or gamma radiation - the increments on the meter face are based upon the probe it is used with.
Select a probe from the table below.

Model 2241-2i
Model 2241-3i
Model 2242

Digital Scaler/ Ratemeter, auto + internal
Digital Scaler/ Ratemeter, auto + internal
Gamma Ratemeter, 2 internal GM

1
1
1

$ x,xxx
$ 1,751
$ 2,552

Internal probe

.
     4. Scaler (big boxes)

Model 2000

Model 2200

Model 2929


Model 3030
Model 3030E

Scaler

Scaler/ Ratemeter, SCA

Alpha Beta Scaler w/Model 43-10-1 Sample Counter

Alpha/Beta Scaler
Alpha/Beta Scaler

1

1

1


1
1

$ 1,513

$ 1,773

$ 5,215


$ 3,602
$ 1,654

Requires an external probe
A probe may be selected for alpha, beta and/ or gamma radiation - the increments on the meter face are based upon the probe it is used with.
Select a probe from the table below.

.
     5. Ion Chamber

-

Model 9

Model 9-3
Model 9-4
Model 9-7

Model 17

Ion Chamber

Ion Chamber (5 ranges)
Ion Chamber (5 ranges)
High Range Ion Chamber

High Range Ion Chamber

-

2
2
1

-

$ 1,930

$ 1,625
$ 1,675
$ 2,527

$ 1,930

Detection chamber is internal

RED = Discontinued
Every one of the above devices must employ a "detector". Some devices have an internal detector, some use an external detector. The next table summarizes the external radiation detectors available from Ludlum Instruments. The devices above must be matched to a detector from the table below, for the meter to produce accurate values.

After viewing a number of Ludlum Models, it has become apparent that there has been much variation of each model over time.
The appearance of a given model number will depend upon the serial number. Here are some examples

-

110

340 - 710

40

60

160




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     Ludlum Model Variations

Model
Number
OLDER
Serial Numbers
.
NEWER
Serial Numbers

Model 12

Headphone jack
No audio On-Off

No jack (speaker)
Audio ON-Off

No F/ S switch

F/ S switch

6 external adjustments
scattered

6 external adjustments
in row

No HV push button

HV push button

Model 16

7 external adjustments

8 external adjustments
in row

Win In-Out middle

Win In-Out left

Model 19

L button

HV button

All Models

Handle type - cast

Handle type - screw

No screws in meter face

4 screws in meter face

Machined metal knob

Plastic pointy knob

Knurled batt. box screw

Single Slot batt. box screw

100 - 500

200

200



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     Ludlum Detector Types

Emission Type
# of
Probes

Alpha

10

Alpha Beta

5

Alpha Beta Gamma - Multi

10

Alpha Gamma

none

Beta

4

Beta Gamma

6

Gamma

13

TOTAL =

48

150-400

50

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     2. Ludlum Radiation Detectors -
         Probes - Sensors
         Particle/ Wave Detection

Ludlum
Example

Features

Back-
ground
CPM
Sensi-
tivity

CPM/
µR/
hr
Oct.
2010
Price

.
     1. Alpha Scintillators

-

Model 43-1
Model 43-2
Model 43-5

Model 43-65
Model 43-90
Model 43-92

Alpha Scintillator, lighthouse
Alpha Scintillator, end
50 cm Alpha Scintillator, rectangle

50 cm Alpha Scintillator, square
100 cm Alpha Scintillator, rectangle
100 cm Alpha Scintillator, rectangle

3
3
3

3
3
3
e=33
e=30
e=13

e=17
e=20
e=24

$ 1.022
$ 491
$ 875

$ 903
$ 973
$ 1,011

.
     --- Alpha Air Proportional

-

Model 43-40-2
Model 43-40-3
Model 43-44
Model 43-44-1

Alpha Air Proportional Detector
Alpha Air Proportional Detector
50 cm Alpha Air Proportional
100 cm Alpha Air Proportional

3
3
-
-
e=10
e=10
e=8
e=8

$ 683
$ 790
$ 581
$ 587

.
     2. Beta

-

Model 44-1

Model 44-110

Model 44-116
Model 44-142

Beta Scintillator, end

Tritium Detector, gas proportional, rectangle

100 cm - Beta Scintillator, rectangle
100 cm - Beta Scintillator, rectangle

100

400

-
< 300
e=7

e=25

-
e=4/30

$ 537

$ 980

$ 1,102
$ 1,070

.
     3. Gamma

-

Model 44-2
Model 44-3

Model 44-10
Model 44-11

Model 44-17

Model 44-20

Model 44-62

Model 44-172

1" x 1" NaI Scintillator, end window
1" x 1 mm Low Energy Gamma Scintillator, end

2" x 2" NaI Scintillator, end
2" x 2" Integral NaI Scintillator

2" x 2mm NaI Scintillator, end

3" x 3" Integral NaI Scintillator, end

1/2" x 1" NaI Scintillator, end window

YSO Scintillator, end

1,900
< 250

9,750
9,750

1,500

23,000

600

250
175
675

900
900

2,500

2,300

49

e=40

$ 602
$ 548

$ 1,039
$ 1,513

$ 1,040

$ 2,247

$ 1,039

$ 838

Model 133-2
Model 133-4
Model 133-6
Model 133-7
Model 133-8

Geiger-Mueller Detector
G-M Detector
G-M Detector
G-M Detector
G-M Detector

12
1
1
1
1
100
100
18
4.2
0.7

$ 276
$ 276
$ 283
$ 294
$ 424

.
     4. Alpha Beta

-

Model 43-1-1
Model 43-2-2

Model 43-89
Model 43-93

Alpha/ Beta Scintillator, lighthouse
Alpha/ Beta Scintillator, end window

100 cm Alpha/ Beta Scintillator
Alpha/ Beta Scintillator

300
50

300
300
e=30
e=30/25

e=20
e=20

$1,231
$ 591

$1,180
$ 1,105

Model 43-68

100 cm Gas Proportional Detector

350
e=20

$ 475

.
     5. Alpha Beta Gamma

-

Model 44-7
Model 44-9

Model 44-9-18

Model 44-25
Model 44-26

Model 44-40
Model 44-40-2


Model 44-88
Model 44-89
Model 44-94

End Window G-M Detector
Pancake G-M Detector
Telescoping Pancake G-M Detector

Pancake G-M Hand Frisker
Pancake G-M Foot Frisker

Shielded Pancake G-M Detector
Aluminum housed lead-shielded
     Pancake G-M Detector

Cylindrical Pancake G-M Detector
Square Cluster Pancake G-M Detector (4)
Diamond Cluster Pancake G-M Detector (4)

40
60
60

120
180

25
-


60
240
240
2,100
3,300
3,300

6,600
9,900

3,300
-


3,300
13,200
13,200

$ 253
$ 231
$ 486

$ 457
$ 587

$ 554
$ 1,038


$ 328
$ 914
$ 892

.
     6. Beta Gamma

-

Model 44-6

Model 44-38

Thin Wall G-M Detector, beta window, side

Energy Compensated G-M Detector, side

25

25
1,200

1,200

$ 288

$ 308

Model 44-21
Model 44-98
Model 44-172

Beta Gamma Scintillator, end
BGO Scintillator, end
YSO Scintillator, end

450
650
250
e=38/19
e=20
e=40/25

$ 655
$ 863
$ 838

Model 44-92

140 cm Xenon Gas Proportional Detector

-
36K

$ 1,747

130

380 - 690

50

60

70

For most people, radon is the biggest threat, due to its accumulation
within buildings. Inhaled radon gas causes lung cancer.



DISCLAIMER :
This page is NOT associated with Ludlum Measurements, Inc.
I know very little about nuclear radiation.
I am building this page just for self-education.
Although the author has tried to be as accurate as possible, errors are possible.

I could not find a Ludlum Radiation Detection device summary quite like the above. So, I made this ionizing radiation detection summary chart, to help myself understand the technology. I hope that it helps you.

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Vaughn Aubuchon Author Bio

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This Vaughns Ludlum Radiation Devices Information
summary was last updated on 2020-03-12.