Skip to main content
Fluke Biomedical LANDAUER RaySafe


Comprehensive solutions for the X-ray room

RaySafe 452 Radiation Survey Meter

452 lids
Woman in lab coat measuring with the RaySafe 452
Survey meter applications
RaySafe 452 Survey Meter - Air Kerma
RaySafe 452 Survey Meter - Ambient Kit

    Spend more time on measurements and less time on settings

    The RaySafe 452 Survey Meter is used for radiation measurements, and is compliant with IEC 60846-1. It has high sensitivity combined with a wide and flat energy response making it suitable for a broad range of medical and industrial radiation applications.

    RaySafe 452 does not require any corrections or manual settings, letting you focus on radiation protection rather than setup. Just turn on the instrument and within a few seconds, you are ready to measure. 

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

    Model demonstrating RaySafe 452 essentials

    Broad range of applications

    The ability to measure alpha, beta, gamma, and X-ray radiation, combined with excellent performance over a wide energy range, makes RaySafe 452 suitable for X-ray tube leakage, scattered and environmental radiation detection, non-destructive testing, and more. It measures ambient dose equivalent, air kerma and counts, all in one device.

    Fast response time and automatic data storage

    The proven technology utilizing silicon diodes combined with an energy compensated Geiger-Muller tube provides high sensitivity and stability over a very wide energy and dose rate range. The dose sensitive thin-walled Geiger-Müller tube enables a fast response time even at very low dose rates while the silicon diodes provide accuracy and speed at higher dose rates. The dose rate value is automatically saved every second providing comfort not to lose data.

    Data analysis and reporting

    RaySafe View, the included PC software, provides easy data transfer for further analysis and reporting. This software also supports settings of alarm threshold values.

    Easy handling

    The intuitive interface shows all parameters in one view. The integrated handle and display are positioned so you are able to see readings at all times. Navigation buttons are within easy reach of your thumb when holding the device.

    Built for indoor and outdoor usage

    Featuring a durable design, a wide temperature range, and IP64 classification ( (dust-proof and water resistant), makes indoor and outdoor measurements possible without worrying about the instrument. RaySafe 452 can also without any problems be wiped with a wet cloth or washed under rinsing water.


    Typical applications

    The RaySafe 452 Radiation Survey Meter can be used for many applications including these:

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

    Tube leakage

    Tube leakage is the radiation emitted from the machine outside the primary beam. All X-ray tubes have some radiation leakage. Tube leakage measurements are important for controlling the work environment for hospital staff who work close to the X-ray machine. Several measurements are made around the tube housing, and at positions where personnel typically stand during an operation. From tube leakage measurements, calculations are made to estimate an operator’s body radiation dose, for a single exposure or over an extended period.

    According to IEC 60601-1-3, clause 12.4, the tube leakage is not allowed to exceed 1 mGy, averaged over the busiest hour in the lab, when measured at a distance of 1 m from the focal point with a sensor area of 100 cm2.

    Tube Leakage

    Scattered room radiation

    At an examination, a portion of the X-rays that hit the patient and the table are scattered and travel in all directions in the room. Survey meter measurements of scattered radiation are important for controlling the work environment for personnel who work close to the X-ray machine.

    At measurements of scattered radiation, a phantom is placed in the primary X-ray beam to simulate a patient and increase the scatter. The survey meter is often mounted on a stand but may also be hand-held. Several measurements are made around the X-ray machine at positions where personnel typically stand during operation. From the measurements, calculations are made to estimate an operator’s body radiation dose, for a single exposure or over an extended period of time.

    Scattered Radiation

    Wall leakage

    Wall leakage measurements are performed to ensure radiation from X-ray rooms does not leak through the walls and exceed critical limits outside the X-ray room. Common measurement cases are at installation of new X-ray machines or after renovations of X-ray rooms.

    The survey meter measures across the walls of interest while the X-ray machine is operating. Measurements are normally performed with a worst-case scenario of settings on the X-ray machine (high kVp and/or high mAs). Typical points of interest for wall leakage measurements include the upper part of the wall, corners, windows, doors, etc. The survey meter is often hand-held but may also be mounted on a tripod for longer measurements. Low dose rates normally mean longer integration times of the survey meter.

    From the survey meter measurements, calculations are made to check if critical radiation limits are exceeded. To perform the calculations correctly, it is vital to know if the location is a controlled or public access area. Furthermore, parameters such as workload, occupancy, leakage, and target dose need to be considered.

    Wall Leakage

    Control of radioactive drugs in patients

    In nuclear medicine, radioactive drugs are used for imaging and treatment. Small amounts of radioactive material is ingested by the patient, typically by inhalation, swallowing, or injection into the bloodstream.

    Patients undergoing nuclear medicine treatments can be a source of radiation exposure for staff, family and the public. Survey meters are used to monitor the radiation from the radioactive drugs in the body. The measurement results decide if the patient needs to be quarantined or if it is safe for staff and family to be near the person. Patients may be monitored for several days after a treatment, and data needs to be logged.

    For repeatability, it is common to measure radiation at a certain distance from the patient. At measurements, the survey meter can be hand-held or mounted on a tripod.

    Control of treated patient


    In nuclear medicine, radioactive substances are used for imaging and treatment of patients. Since radioactive substances have a specific decay time, and only are active for a certain amount of time,  drugs must be prepared at the hospital right before the examination. At preparation, it is important to ensure that no radioactive substances have been spilled on surfaces, or on the radiopharmacist preparing the drugs. The presence of unintended or undesirable radioactive substances is commonly referred to as contamination.

    The survey meter is typically used to scan for spills on surfaces, as well as gloves and hands of the radiopharmacist. When sweeping across the area of interest to detect and measure contamination, it is important to be close to the surface and to move the meter slowly, since the amount of spilled source can be very small and hard to detect.

    Contamination measurement

    As versatile as you are

    The RaySafe 452 measurement technology is based on a proven combination of a silicon sensor cluster and a Geiger-Müller tube. The instrument has two interchangeable lids (depending on model) to switch between air kerma, ambient dose equivalent and counts. This flexible design makes it a versatile instrument suitable for a broad range of applications.

    RaySafe 452 with removable lids

    Excellent measurement performance over a broad energy range

    Most survey meters do not handle all photon energies equally well. Instruments may either overestimate or underestimate the rate at certain energy levels. Unlike similar instruments, The RaySafe 452 design handles a wide range of applications and energies providing:

    • A wide and flat energy response
    • High sensitivity
    • Quick response time

    These are important features since adjustments using correction factors are hard to make due to the spread of photon energies within the radiation beam. Unlike for many other survey meters, no measurement adjustments are needed when using a RaySafe 452.

    Wide and flat energy response

































































































































    Raysafe View Software

    The program RaySafe View can be used an extended display and tool for further data analysis. Raysafe View also connects to Microsoft Excel.

    Raysafe View replaces X2 View and contains all the functionalities of X2 View and more. Raysafe View supports the RaySafe X2, the RaySafe X2 Solo, and the RaySafe 452. 

    Download RaySafe View Software


    Documents & Downloads

    Product Catalog


    Leaflets and Flyers

    Case Studies

    Manuals and Instructions

    Quick Guides

    White Papers



    Certificates and Declarations


    Note! For site/company certificates, and laboratory accreditations, see information about our quality system.

    Videos & Webinars

    Video Library


    Understanding Radiation Survey Meters: The Pros and Cons of this Powerful Technology Webinar

    Radiation survey meters come in many forms and knowing how to read it and understand its accuracy is crucial to preventing dangerous exposure for everyone. Magnus discusses the technology behind making sure the environments you work in are safe.


    RaySafe 452 Radiation Survey Meter product demonstration video

    Watch the demonstration video to learn more about this versatile product designed to keep up with you.

    RaySafe 452 | Know when it is safe to enter (HazMat)

    You’re trained to deal with all types of situations by using your basic senses. At scenes you anticipate encountering hazardous materials such as gas and solvents. But what about the dangers you can’t see, hear, or smell?

    RaySafe 452 日本語デモビデオ


    The RaySafe 452 Radiation Survey Meter: Made With You In Mind

    Get a sneak-peek into the focus, fun and personal passion each team member brings to a RaySafe product from the conceptual stage through shipping it out the door to you.

    One device. Endless Possibilities. RaySafe 452 Radiation Survey Meter.

    RaySafe 452 Radiation Survey Meter: By Physicists for Physicists

    RaySafe 452 Applications

    RaySafe 452 Radiation Survey Meter | Product Demonstration

    RaySafe 452 - Lids and Measurements

    RaySafe 452 - Settings

    RaySafe 452 - Using RaySafe View

    RaySafe 452 - Stored Measurements

    How to Clean the RaySafe 452 Radiation Survey Meter

    The Evolution of the 451 to the 452

    Can I use the RaySafe 452 for long-term measurements, like area monitoring?

    Yes, the RaySafe 452 is suitable for long-term measurements.

    Some tips to consider:

    • Position the RaySafe 452 with the round, flat surface towards the potential radiation source. There is a tripod screw thread at the end of the handle that can be used for fixed positioning.
    • The battery lasts for up to 100 hours. Connect the supplied charger for sessions longer than that. 
      24 hour icon
    • After powered on for 24 hours, the instrument automatically stores a measurement and starts a new one. You are notified about the start of a new measurement with a symbol on the screen. Press the center button to confirm.
    • The instrument has a one-second resolution dose rate log with a capacity of up to 10 days. If you need a one-second resolution log for a longer period, you can import and store the measurements in RaySafe View (PC software), for example on a weekly basis. Alternatively, you can perform the measurements with the instrument connected to a computer running RaySafe View. Then, the one-second resolution is not restricted in time, since all measurements are automatically imported to RaySafe View. As a bonus, the battery in the RaySafe 452 is charged from the computer.

    Note: There is no auto save functionality in RaySafe View, why we recommend you to manually save the RaySafe View file every now and then to avoid loss of data.

    My RaySafe 452 shows an error message when I try to measure contamination (without lid). Why?
    Counter function Error

    If you see an error like this, you have an instrument model without the counter functionality. The model that can measure without lid is denoted RaySafe 452. An instrument with model name RaySafe 452 Ambient or RaySafe 452 Air kerma requires a lid to measure. See the model name on the label of your instrument. 

    RaySafe 452, with counter functionality:

    452 counter

    Models without counter functionality:

    452 Ambient Certifications
    452 Air Kerma Certifications
    Do I need to calibrate my RaySafe 452?

    We recommend a yearly calibration of the RaySafe 452 and offer service programs. The calibration date is printed on the lid(s). Note that the RaySafe 452 must be calibrated together with its specific lids.

    Can I use the RaySafe 452 for isotope identification?

    No. The RaySafe 452 measures the mean photon energy of the complete spectrum, including scattered radiation, and is not able to quantify the energy of specific spectral peaks. The mean energy parameter is meant to be used more as a rough estimate for radiation protection purposes.

    Does the RaySafe 452 need specific documentation to be transported by air?

    No, you can ship the RaySafe 452 by air without extra paper work. Some survey meters, like the Fluke 451P and other similar instruments, are pressurized and classified as hazardous material.

    The RaySafe 452 is not pressurized and is therefore not classified as hazardous material.

    Can I use the RaySafe 452 to measure neutron radiation?

    No, the RaySafe 452 is not sensitive to neutrons.

    I have a peak in my dose rate log, much higher than the expected dose rate from my measurements. Why?

    Most likely, your instrument has detected a muon. A muon is a high energy particle from space. It is detected by the RaySafe 452 as a 1-2 seconds long pulse with a dose rate that is approximately 100 times the background level.

    At sea level, the RaySafe 452 typically detects one or two muons per day. At higher altitudes, for example when travelling by air, the number of detected muons increases to hundreds per day.