DE202006014158U1 - Disengageable passive Radon exposimeter e.g. for radiation protection, contains manual or automatically adjustable film cover which is adjustable by manual operation technology - Google Patents

Abstract

The disconnectible passive Radon exposimeter contains a manual or an automatically adjustable film cover (2). The film cover (2) is adjustable by manual operation. The film cover is automatically adjustable by catch mechanics (3) and a controller (4). The controller contains an acceleration sensor and a timer circuit.

Description

It is an invention in the field of radiation protection measurement, an improvement in the detection limit and an increase in Ease of use usual Radonexposimetern causes.

Previous state of the art:

The Radiation Protection Ordinance calls for employees of waterworks, underground operations and Radon spas, the exposure by the natural to detect radioactive noble gas radon. This happens mostly with passive exposimeters used by the persons during the Work on the body too are wearing (see DIN 25706-1).

One Disadvantage of the currently used Exposimeter is that they too then by the ubiquitous Radon exposed when not worn. Around additional To be able to calculate out exposure have to the exposimeter outside working hours are stored at reference sites whose mean Radon concentration is determined by the use of further exposimeter. In addition, must the times when the device was worn was, by the employees be recorded in writing. The necessary correction of the exposure value as well as the uncertainties in the determination of the wearing times and The radon concentration at the reference site leads to great uncertainties and bad Detection limits. About that In addition, the effort to be made by those affected reduces their acceptance the exposimeter.

Problem:

• - improvement the detection limits and the measurement accuracy
• - Simplification handling and, consequently, greater acceptance of the measuring devices

Troubleshooting:

The Radon exposure is only during the Wear times (or during working hours); while Storage times, however, the Radonexposition is prevented. To is the device equipped with a locking mechanism, either manually or over an acceleration sensor or a timer in conjunction controlled by a microcontroller. The acceleration sensor signals if the device is worn (working time) or not (storage time). In the condition "storage time" becomes the Radonexposition interrupted. For room monitoring (eg to record the radon concentration during working hours), the Locking mechanism can also be controlled by a timer. The immediate shutdown is done by covering the film as possible small distance. The exposure duration is recorded automatically. It can established films and evaluation methods are used, size and dimensions the devices are still in the "portable" area.

How it works in detail (Embodiment)

An embodiment of the invention is in 1 and 2 shown schematically. Show it:

1 a longitudinal section through the Exposimeter,

2 the top view of the exposimeter.

In the 1 is the movie ( 1 ), the cover ( 2 ), the locking mechanism ( 3 ), the control unit with acceleration sensor and time recording ( 4 ) and the power supply ( 5 ).

In the 2 is the movie ( 1 ) and the cover ( 2 ).

The cover ( 2 ), if radon exposure is not desired, either manually or through the shutter mechanism (FIG. 3 ), consisting of an electric motor or magnet, automatically in front of the film ( 1 ) are pushed.

• – (für Messungen an Personen) durch den Beschleunigungssensor, der bei registrierten Bewegungen (= Arbeitszeiten) die Abdeckung (2) über die Verschlussmechanik (3) öffnet und sie bei nicht mehr registrierten Bewegungen (= Lagerzeiten) wieder schließt, oder
• – (für Messungen in Räumen) durch die Zeiterfassung (Zeitschaltung), die eine zeitabhängige Programmierung der Schließ- und Öffnungszeiten der Abdeckung (2) auch über einen längeren Zeitraum ermöglicht, z. B. zur Ermittlung der Radonexposition in Büroräumen während der Arbeitszeiten.

The control unit ( 4 ) consists of an acceleration sensor, a time recording (timer) and a microprocessor. It serves to lock the lock mechanism ( 3 ) automatically, either

• - (for measurements to persons) by the accelerometer, which in registered movements (= working hours) the cover ( 2 ) about the locking mechanism ( 3 ) and closes it when the movements are no longer registered (= storage times), or
• - (for measurements in rooms) by the time recording (timing), the time-dependent programming of the closing and opening times of the cover ( 2 ) also over a longer period allows, for. B. to determine the Radonexposition in offices during working hours.

The power supply ( 5 ) provides the locking mechanism ( 3 ) and the control unit ( 4 ) with the necessary operating voltage.

Claims (5)

Switch-off passive radon expo- simeter, characterized in that it has a manually or automatically displaceable film cover ( 2 ) contains. Radonexposimeter according to claim 1, characterized in that the film cover ( 2 ) is displaceable by manual operation. Radonexposimeter according to claim 1, characterized in that the film cover ( 2 ) automatically by a locking mechanism ( 3 ) and a control unit ( 4 ) is displaceable. Radonexposimeter according to claim 3, characterized in that the control unit ( 4 ) contains an acceleration sensor. Radonexposimeter according to claim 3, characterized in that the control unit ( 4 ) contains a time detection (timing).