Environmental level radiation measuring instrument

PDR-111High sensitivity pocket sized environmentX\\\\Gamma monitoring instrument

1.Overview

PDR-111 is a small, lightweight, and portable radiation detector that uses CsI scintillators as detectors. It can achieve very high sensitivity and accurately measure the background level of gamma rays in the environment.

The size of PDR-111 is only the size of a mobile phone, weighing only 220g, and powered by a regular No. 5 battery (continuously used for more than 70 hours), which is very convenient for users to use. The instrument also has sound and light flashing alarm functions, and the alarm threshold is set by the user themselves. The product has high measurement accuracy and beautiful appearance, especially suitable for nuclear safety management personnel and use.

2.Instrument specifications and parameters

1) Measurement objects: X-rays, gamma rays

2) Energy range: above 50keV

3) Detector: CsI (Tl) scintillator

4) Measurement range: 0.001 μ Sv/h~1.999 μ Sv/h; 2.00 μ Sv/h~19.99 μ Sv/h (automatic range switching)

5) Indication error: within ± 15% (relative to)¹³⁷Cs）

6) Energy response: 60 keV~1.25 MeV: relative to¹³⁷The correction constant ratio of Cs is 0.85~1.15

7）Display: 4-digit LCD

8) Measurement mode: Normal mode: displays dose rate mode by automatically switching time constants; AEM mode: During continuous pressing and holding of the AEM button, divide the accumulated dose by the accumulated time to display the dose rate mode

8) Alarm prompt: audible alarm, alarm prompt flashing

9) Alarm threshold setting: 1~19 μ Sv/h, every 1 μ Sv/h (no alarm threshold set at the factory)

10) Other: Display of battery level decrease, measurement value overload display

11) Power supply: 1 No. 5 alkaline battery

12) Battery life: Over 70 hours of continuous use

13) Usage conditions: Temperature: 0 ° C~+45 ° C, humidity: below 90% RH (no frost)

14) Dimensions: Approximately 62 (W) × 27 (D) × 135 (H) mm

15) Weight: Approximately 220g

3.Actual application of equipment

This instrument played a very important role in the Fukushima nuclear power plant accident that occurred in Japan this year. The Japanese Ministry of Education, Culture, Sports, Science and Technology used PDR-101 (old model) to monitor the air dose in the sea around Fukushima. Its accurate measurement data provided great assistance for post nuclear accident radioactive monitoring. The following figure shows the results of its measurement:

Because PDR-111 uses CsI as the detector, it can achieve very high sensitivity (with a measurement lower limit of 0.001 μ Sv/h) and stable energy response, allowing for very accurate measurement of air dose rates.

4.Summary of characteristics

Small and lightweight inspection instrument

Using CsI (Tl) scintillator and ultra small photomultiplier tube

N can measure the background level of gamma rays in the environment with high precision

Alarm function

The power supply can use a regular No. 5 battery

For districts and counties, this instrument can be used for daily monitoring of environmental background values and radiation values in some source related workplaces. Its accurate and stable performance can ensure the accuracy of measurement data; Once an emergency accident occurs, the portability and accuracy of this device can be utilized to accurately monitor changes in environmental dose rates, which plays a significant role in accident monitoring and analysis.