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Model 23-1

mSv Electronic Personal Dosimeter

Part Number: 51-2961

Features

Low Weight and Slim Design
X-ray and Gamma Radiation Monitoring
Audible Alarm
600 Record Data Logging Option Available

The Ludlum Model 23-1 mSv Electronic Personal Dosimeter is a compact and lightweight (55.9 g / 2 oz) pen-type personal dosimeter. It is ideal for the measurement and general monitoring of gamma and X-ray radiation in medical and laboratory environments, as well as any controlled or restricted area where personal radiation monitoring is required or desired. The unit is sensitive to a wide range of energies from 35 keV to 3 MeV. Dose, Dose Equivalent Rate, and alarm values are easily seen on the four-digit LCD screen. An audible alarm is activated if the dose or dose rate exceeds the preset value of the dosimeter. The alarm set points are adjustable from the face of the unit.

The optional Model 23 Series Dosimeter Setting Device and Software Kit (see Options tab below) can be used to configure the dosimeter settings and to quickly take data directly from the dosimeter via infrared communication to a PC. Up to 600 data points can be stored in the dosimeter. Note that all collected data is erased when the dosimeter is turned off, so the data must be transferred before the dosimeter is turned off in order to be recorded.

Warning: This dosimeter may not measure pulsed radiation accurately.

Specifications

Radiation Detected	Gamma and X-ray (35 keV to 3 MeV)
Detector	Silicon semiconductor
Measurement and Display Range	Accumulated Dose	0.001 mSv to 999.9 mSv
	Dose Rate*	0.001 mSv/h to 999.9 mSv/h
	Accumulated dose data is automatically deleted when the Model 23-1 is switched ‘On’.
Display	4-digit OLED with indicators for dose, dose rate, operating time, and alarm
Accuracy	≤ ±10% (0.01 to 999.9 mSv (1.0 mrem to 99.99 rem), ¹³⁷Cs)
Energy Response	≤ ±20% (60 keV to 1.5 MeV, ¹³⁷Cs)
Angular Response	≤ ±20% (Up to ± 60 degree vertical and horizontal, ¹³⁷Cs)
Dose Rate Linearity*	≤ ±10% (¹³⁷Cs)
Alarm Volume	Approximately 60 dB (at 20 cm)
Data Logging	Up to 600 records (optional IR reader required for data transmission to PC)
Environment	-10 to 40 °C (14 to 104 °F) ≤ 90% relative humidity (non-condensing)
Power	One each coin-type lithium battery (CR2450, P/N 21-8639)
Battery Life	720 hours (without alarm / communication)
Size (H x W x D)	112.8 x 30 x 12 mm (4.4 x 1.2 x 0.5 in.)
Weight	55.9 g (2 oz.)

*Note: The instrument indicates rough value for dose rate measurements in low radiation fields, such as less than 1 mSv/h (100 mrem/h), so it should only be used for reference.

Options

Option	Description	Part Number
Dosimeter Setting Device and Software Kit	This kit includes an infrared reader and software that connects a Model 23 Series dosimeter to a PC in order to adjust the configuration and to transfer logged dose readings.	51-2959

Description	Part Number
Clip	2314081
Battery Cover	2314082