What are the two types of personal dosimetry? Active and Passive dosimetry

Ever wondered how professionals measure an individual's exposure to ionizing radiation? What are the two types of personal dosimetry? The answer: Active and Passive dosimetry. Intrigued?

Active dosimetry offers real-time radiation exposure data, while passive dosimetry records radiation over time, analyzed later.

Dive in to uncover the intricacies and applications of both active and passive dosimetry, and why they're pivotal in the realm of radiation safety. Ready to embark on this enlightening journey?

This guide takes you through all the steps necessary to understand what are the two types of personal dosimetry and what is the difference between active and passive dosimetry.

What are the two types of personal dosimetry ?

Personal dosimetry, used to measure an individual's exposure to ionizing radiation, is categorized into two main types:

1. Active dosimetry : Provides real-time radiation exposure data.
2. Passive dosimetry: Records radiation exposure over a period, which is then read later.

Both types help ensure safety standards are maintained in environments with radiation exposure.

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What is active dosimetry?

Operational dosimetry, also known as active dosimetry, measures exposure in real time as it occurs.
It is used to monitor the dose received by workers in nuclear power plants handling radioactive materials, and in nuclear medicine for the health, industry, defense and security sectors.
In particular, it can be used to pinpoint where overexposure is occurring, so that action can be taken quickly.

This is provided by an electronic device called a personal electronic dosimeter, which can be used both to measure the dose received by the whole body and to monitor a radioactive zone.
These devices are worn on the body, at chest level, and record dose information from ionizing radiation sources(X-rays, Gamma rays, Beta rays, Neutrons).

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What is the difference between active and passive dosimetry?

What is the difference between active and passive dosimetry?

Active dosimeters can provide an immediate reading of exposure levels on site, while passive or delayed-reading dosimetry devices measure a cumulative dose over the period of use.

Passive dosimeters do not provide immediate readings like operational dosimeters do!

The individual operational dosimeter provides the wearer with an immediate indication of the ambient dose equivalent rate Hp(10).

It features adjustable visual and audible alarms and data logging functions.

What is the difference between operational dosimetry and passive dosimetry?

There can be a significant difference between passive and operational dosimetry measurements due to the measurement uncertainty inherent in the technology of each instrument.

Sensor compatibility can also affect measurement (magnetic field, drop or shock, temperature).

It's important to choose the right sensor for the conditions in your industry, in order to obtain reliable and accurate measurement results.

To find out more about how to deal with these deviations, please consult the NF ISO 15690:2013 standard, available fromAFNOR.

What is the legislation on operational dosimetry?

What is the legislation on operational dosimetry?

External dosimetry, which measures external exposure outside the body, is a tool for assessing the dose received by a person in a supervised or controlled area.

The main aim of this process is to identify workers who have been exposed to certain working conditions. The level of this exposure is also a key piece of information to be determined.

Once this type of data has been collected, workers can take appropriate action. This enables them to reduce their exposure and avoid overexposure.

It is important to note that these actions must comply with regulatory requirements. In France, these rules are defined by Article R4451-64 of the Labor Code.

What is the legislation on external operational dosimetry?

According to French regulations and decree no. 18-437 of June 4, 2018 amended by decree no. 2021-1091 of August 18, 2021 relating to worker protection against the risks associated with ionizing radiation, the employer ensures appropriate individual dosimetric monitoring management to monitor compliance with regulatory thresholds.

The Radiation Protection Advisor (RPA ) (formerly known as the Radiation Protection Competent Person (RCP)), under the responsibility of the plant manager, is responsible for ensuring that dosimetry is implemented in the plant.

The employer may also hire a radiation protection officer (RPO).

What is the reference passive or operational dosimetry?

What is the reference passive or operational dosimetry?

Health and safety regulations require classified employees entering a supervised area to use at least one operational dosimeter. Results and data must be transmitted weekly to SISERI (Système d'Information de la Surveillance de l'Exposition aux Rayonnements).

In addition, active or operational dosimetry is mandatory for access to controlled areas for professionals with a higher risk of exposure.

Where can I buy an operational dosimeter?

It's best to turn to a manufacturer who has the right equipment (dosimeter, reading terminal, etc.), telemetry solutions and associated services.

There are several conditions to consider when looking for a dosimeter:

  • Reputation - It's important to choose a builder with a good reputation so that it doesn't compromise the safety of you and your staff in any way.
  • Quality - Make sure the manufacturer uses only high-quality materials to manufacture its product.
  • Delivery times - Make sure the builder is able to deliver the products on time to avoid delays in implementation.

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Remember: operational dosimetry, a valuable tool

Operational dosimetry is an invaluable tool for providing real-time information and limiting workers' exposure to ionizing radiation.

It's important to comply with legislation when installing a system, and to make sure you buy a solution from a recognized manufacturer to guarantee your safety and proper risk management.

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