Raysafe 452 Radiation Survey Meter

Raysafe 452 Radiation Survey Meter

 

The RaySafe 452 is a powerful survey meter that measures ionizing radiation in a wide variety of applications, including finding spilled isotopes and measuring scattered radiation from X-ray machines and linear accelerators.

Spend more time on measurements and less time on settings. Just turn on the instrument and within a few seconds you are ready to measure.  The RaySafe 452 does not require any corrections or manual settings, letting you focus on radiation protection rather than set-up.

The intuitive interface shows all parameters in one view. All measurement data is stored automatically and the included PC software RaySafe View provides easy data transfer for further analysis and data storage.

One device for every situation means less to carry, learn and administrate. That equals less expense, more efficiency and time savings.

 

Technology
The measurement technology of the RaySafe 452 is based on a combination of a silicon sensor cluster and a Geiger-Müller pancake. The instrument has two interchangeable lids (depending on model) to switch between air kerma, ambient dose equivalent and counts. This design makes it a versatile instrument with a wide and flat energy response along with high sensitivity and a quick response time.

 

Typical applications
 • X-ray tube leakage
 • X-ray wall leakage
 • Scattered room radiation
 • Contamination measurements
 • Environmental radiation
 • Non-destructive testing

 

Key features
 • Broad application range
 • Compliant with IEC 60846-1
 • IP 64 (dust proof and water resistant)
 • Automatic data storage
 • PC software connectivity
 • USB charging
 • Measures alpha, beta, gamma, X-ray
 • Alarm threshold setting
 • Built for indoor and outdoor applications

 

Item 343-900, the RaySafe 452 measures air kerma, ambient dose equivalent and can also detect alpha and beta radiation with its' GM tube. Its performance is a combination of the 451P (R and Sv), 451B (R and Sv) and the ASM-990. Measures in Sv, rem, R, Gy, rad, cps, cpm

Item 343-902, the RaySafe 452 Air Kerma  Radiation Survey Meter is specifically made for air kerma/radiation measurements. Corresponds closest with the 451P/B (R models). Measures in R, Gy, rad.         

Large display - Intuitive user interface with easy to view parameters in bright daylight and dark environments. All parameters in one display for overview and easily accessible settings.

Fast response time - The dose sensitive Geiger-Müller pancake enables a fast response time even at very low dose rates while the silicon diodes provide accuracy and speed at higher dose rates.

Convenient data storage - The dose rate value is automatically saved every second providing comfort not to lose data and enabling measurement analysis at a later stage. The data can be transferred to PC with the software.

Sensitive, stable sensors - Silicon diodes combined with an energy compensated Geiger-Muller pancake provide high sensitivity and stability over a very wide energy and dose rate range.

Worry free - Wipe the instrument with a wet cloth or wash under rinsing water thanks to the IP64 classification. The durability and wide temperature range also makes indoor and outdoor measurements possible without worrying about the instrument.

Typical energy response - Most survey meters do not handle all photon energies equally but underestimate the rate at some energies, while others may be overestimated. The RaySafe 452 provides a flat wide energy response as well as high sensitivity.

 • Flat energy response desired as it does not require adjusting the results

 • There’s almost always a spread of photon energies in the radiation beam, making it difficult to use correction factors.

 

Convenient Size - The RaySafe 452 Radiation Survey Meter is about 30% lighter than the 451 making it easy to carry and use. It has a built-in integrated handle on the same level as the display so you are able to see the readings at all times. You won’t cover the display with your hand which can be an issue with other models. The buttons are within easy reach of your thumb when holding the device.

 

The RaySafe 452 Radiation Survey Meter ships with:
 • Instrument with mounted lids (depending on model).
 • Power supply + plugs
 • 5m USB cable
 • Printed user manual and quick guide
 • Calibration certificate
 • Cardboard box with fitted foam.

Item 343-905, RaySafe 452 Heavy Duty Case is an optional rugged case with fitted foam to protect the unit when it is carried around.

 

Specifications – General
Safety Standard: Complies with IEC 61010-1:2010, Pollution degree² 
Radiation Meter Standard: Complies with IEC 60846-1:2009, except EMC which complies with IEC 61326-1:2012, and except alarm sound level
Dimensions: 9.8” x 5.0” x 3.3” (250 x 127 x 83 mm)
Weight: 1.7 lbs (0.8 kg)
Display: 240 x 400 pixel color LCD, sunlight readable, backlit
Rate Alarm: 65 dB(A) at 30 cm (12”)
Operating Temperature: -4 – +122 °F (-20 – +50 °C)
Storage Temperature: -22 – +158 °F (-30 – +70 °C )
Battery Charging Temperature: +50 – +104 °F (+10 – +40 °C) 
Atmospheric Pressure:  70 – 107 kPa, altitude up to 3000 m (10,000 ft)
IP code: IP64 (dust proof and water resistant) according to IEC 60529:1989-2013, with lid mounted, seals intact and nothing connected to USB connector
Humidity, Without Lid: < 90 % relative humidity, non-condensing 
Battery Life: Up to 100 hours
Battery: Built-in rechargeable lithium-ion, 2550 mAh
Connector: USB micro (5 V DC, 1.3 A), for communication and charging
Mounting: Standard 1/4” tripod thread on handle
Data Storage: 4000 stored measurements and 10 days of dose rate log with 1 s resolution
Software: RaySafe View (for remote control, analysis and data export)

Specifications - Radiology, Ambient Dose Equivalent, H*(10) 
Range: 0 µSv/h – 1 Sv/h (0 µrem/h – 100 rem/h)
Rate Resolution: 0.01 µSv/h (1 µrem/h) or 3 digits
Dose Resolution: 0.1 nSv (0.01 µrem) or 3 digits
Energy Range: 16 keV – 7 MeV
Energy Response¹:
>20 µSv/h (2 rem/h) 
and T < 30 °C (86 °F) otherwise
±15 %, 20 keV – 5 MeV
±25 %, < 20 keV or > 5 MeV
±20 %, 20 keV – 1 MeV
–25 % – +150 %, < 20 keV or > 1 MeV
Minimum X-ray Pulse Length²: 5 ms at T < 30 °C (86 °F) 
Minimum Linac Frequency²,³: 100 Hz at T < 30 °C (86 °F)
Rate Response Time: ˜2 s to detect a step from 0.2 to 2 µSv/h (20 to 200 µrem/h)
IEC 60846-1 Energy Range⁴: 20 keV – 2 MeV, angle of incidence ±45°
IEC 60846-1 Dose Rate Range⁴: 1 µSv/h – 1 Sv/h (100 µrem/h – 100 rem/h), non linearity < ±10 %
IEC 60846-1 Dose Range⁴: 1 µSv – 24 Sv (100 µrem – 2.4 krem), coefficient of variation < 3 %
Units: Sv and rem (1 rem = 1/100 Sv)

Specifications - Air kerma, Kair
Range: 0 µGy/h – 1 Gy/h (0 µR/h – 114 R/h) 
Rate Resolution: 0.01 µGy/h (1 µR/h) or 3 digits 
Dose Resolution: 0.1 nGy (0.01 µR) or 3 digits 
Energy Range: 30 keV – 7 MeV
Energy Response¹:
20 µGy/h (2.3 mR/h) and T < 30 °C (86 °F) otherwise
±15 %, 30 keV – 5 MeV
±25 %, 5 MeV – 7 MeV
±30 %, 30 keV – 1 MeV
–25 % – +120 %, 1 MeV – 7 MeV

Minimum X-ray Pulse Length²: 5 ms at T < 30 °C (86 °F) 
Minimum Linac Frequency²,³: 100 Hz at T < 30 °C (86 °F)
Rate Response Time: ˜2 s to detect a step from 0.2 to 2 µGh/h
(23 to 230 µR/h) 
Units: Gy; rad (1 rad = 1/100 Gy); R (1 R = 1/114.1 Gy)
Specifications - Mean Photon Energy, Ē
Range: 20 keV – 600 keV
Uncertainty: 10 % at < 100 keV, 20 % otherwise
Defining Standard: ISO 4037-1:2019
Minimum Dose Rate⁵: 20 µSv/h (2 mrem/h) or 20 µGy/h (2.3 mR/h), at T < 30 °C (86 °F)

Specifications - Counter (a, ß, y)
Detector Type: Geiger-Müller pancake
Window: Mica, 1.5 – 2 mg/cm²
Sensitive Area: 15.55 cm², behind 79 % open steel grid
Range: 0 cps – 20 kcps (0 cpm – 1.2 Mcpm)
Rate Resolution: 0.1 cps (1 cpm) or 3 digits
Counter Resolution: 1 count or 3 digits
Dead Time Correction: Automatic, linearity within -10 % – +30 %Typical background at 0.1 µSv/h: 0.5 cps (30 cpm)
Typical Gamma Sensitivity, ¹³⁷Cs: 6 cps / µGy/h (3000 cpm / mR/h) 
Rate Response Time: ~2 s to detect a step from 1 to 10 cps (60 to 600 cpm)
Units: cps and cpm (1 cpm = 1/60 cps)   
2π Emission Sensitivity⁶:
Radionuclide    Decay (Emax)          Typical Efficiency
¹⁴C                      ß-(0.16 MeV)            15%
⁶⁰Co                    ß-(0.32 MeV)            31%
³⁶CI                     ß-(0.71 MeV)            43%
⁹⁰Sr / ⁹⁰Y             ß-(0.55 / 2.28 MeV)  49%
²³⁹Pu                   α (5.16 MeV)            26%
²⁴¹Am                  α (5.49 MeV)            26%

Footnotes
1. The instrument uses a Geiger-Müller pancake at low rates and a cluster of solid-state sensors at high rates. The rate where the solid-sate sensors are fully engaged gradually increase with temperature, for temperatures above 30 °C (86 °F).

2. Limit where the response is within ±20 % of the response at continuous radiation. Above 30 °C (86 °F) the instrument’s ability to handle low linac pulse rates and short
X-ray pulses gradually declines with increasing temperature.
3. Refers to the microwave pulse repetition frequency of typical medical linear accelerators. Each pulse has a typical duration of a few µs.

4. Ranges where the instrument fulfills IEC 60846-1:2009.

5. Above 30 °C (86 °F) the minimum dose rate gradually increases with increasing temperature.

6. Measured at 3 mm distance between instrument housing (without lid) and wide area class 2 sources according to ISO 8769:2010.