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Monitoring of occupational exposure
The monitoring of occupational exposure is one of the radiation protection measure which helps to optimize the exposure of radiation workers and limit the received doses. The aim of occupational exposure monitoring is the assessment of the internal and external exposure doses of radiation workers. According to these assessments is created safe working conditions and determined whether used radiation protection measures are effective.

Occupational exposure monitoring requirements are regulated by the following legislation of Lithuania:

1. Law on radiation protection (adopted on 1 April 1999);
2. Hygiene Standard HN 73:2001 „Basic Standard of Radiation Protection“ adopted by the Order No. 663 on 21 December 2001 by the Minister of Health Care;
3. Hygiene Standard HN 112:2001 „Requirements for monitoring of internal exposure“ adopted by the Order No. 389 on 17 July 2001 by the Minister of Health Care;
4. The Rules of Monitoring of Workers Exposure and Workplaces adopted by Order No. 63 on 22 November 2007 by Director of Radiation Protection Centre.

If the licensee can not by himself assess the exposure of their workers and perform workplace monitoring, such investigations can perform the laboratory, which should be approved by the order of Ministry of Health Care.

The Radiation Protection Centre (RPC) performs investigation and assessment of internal and external exposure of the workers.

In the Radiation Protection Centre the external dose measurements are performed by thermoluminescent dosimetry method. This method is accredited by Lithuanian National Accreditation Bureau according to the ISO/IEC 17025 standard since 2005.

Measurement of external doses are performed by the RADOS thermoluminescent dosimetry system. Measuring dose range is from 0,05 mSv to 10 Sv. Registered gamma radiation energy is from 10 keV to 1500 keV. The reports of the external radiation dose are presented without the natural background value. Expanded uncertainty of measurement is up to 25 percent.

The personal dose equivalents Hp(10), Hp(0,07) and Hp(3) are measured with the individual thermoluminescent dosimeters. Hp(10) is used for assessment of the whole body dose, Hp(0,07) – for the equivalent dose of skin and extremities, Hp(3) – for the equivalent dose of eye lens. Conservatively assumed that the measured Hp(10) is equal to effective dose. When higher dose is recorded, the calculation of the effective dose is performed.

The internal exposure monitoring is performed by measurement of gamma radionuclide activities in the whole human body or in different parts of the body or in the biological or physical samples, which were sampled in the workplace. According to these results of measurement is estimated the committed effective dose or the equivalent dose.

The direct measurement methods are used for detection of penetrating radiation in the human body or in different parts of the body (thyroid, lung). For direct measurements of internal exposure are used the whole body counter with Ge(Li) detector and thyroid counter with Na(I) detector at the RPC. Using direct methods are performed internal exposure measurements of nuclear medicine workers, who use the open radioactive sources during their work.

The internal exposure doses are assessed according to the measured activities. For the assessment are used the IMBA and MONDAL software packages.

The more detailed information about occupational exposure monitoring is set in annual reports of of RPC.


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