Abstract
The testing of the individual monitoring instruments is important to demonstrate the performance of the instruments to give accurate measurements in workplace environment. In this research, 18 Thermoluminescence dosimetry (TLD) units were calibrated individually at surface water phantom and exposed with 60Co source at block 32 in Malaysia Nuclear Agency. The TLD were exposed at 5.00 meter distance from the source. The exposed TLD in terms of Personal Dose Equivalent at 10mm depth tissue, (Hp (10)) equal to 2.00mSv. The exposed TLD then be measured using winRems software from Harshaw TLD reader 6600 plus for defining the calibration factor in term of mSv/nC. After that all the 18 unit TLD were tested using linearity testing method and 18 TLD units were exposed with different dose that were 1mSv, 5mSv, 7mSv, 10mSv, 15mSv, and 20mSv. The research is conducted to satisfy two main objectives which was to obtain linear regression coefficient R2 ~ 1 and to show that the ratio of measured value over standard values are within ICRP trumpet acceptance limit curve, which are within (-33% to +50%).
Highlights
Secondary Standard Dosimetry Laboratory (SSDL) of Malaysia Nuclear Agency (MNA) is a national standard laboratory for ionizing radiation and it is responsible in supplying, evaluating and analyzing occupational dose for more 20,000 radiation workers in Malaysia
There are more than 2000 radiation workers using Harshaw type thermo luminescence dosimeter (TLD) as their personal dosimeter
The personal dosimeter is used for this type of doses, usually called a "badge", which is worn by the worker all the time they exposing to radiation to ensure that their dose limits is not exceeded, if there is a non-sealed source in the workplace the radioactive material enters will enter the worker body and will absorbed by his organ or tissues inside his body [4]
Summary
Secondary Standard Dosimetry Laboratory (SSDL) of Malaysia Nuclear Agency (MNA) is a national standard laboratory for ionizing radiation and it is responsible in supplying, evaluating and analyzing occupational dose for more 20,000 radiation workers in Malaysia. A goal from the individual monitoring of the worker is very important to ensure that the worker doesn't exceed the limit of the equivalent dose They used to measure the absorbed dose of the workers at a specific depth of their bodies, mostly, at 0.07mm and 10mm (0.07mm the effective dose for the skin Hp (0.07) and10mm for the dose inside body's organs Hp (10) are measured [12]. The Thermoluminance dosimeters used for individual monitoring such as LiF (Lithium fluoride) that doped with MgCuP and commercially known as TLD-100H will be examined At the first, their calibration will be done and their linearity response will be studied [13]
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