[en] Most of the laboratories in Malaysian Nuclear Agency are using chemicals in their research activities. However, it is known that using of chemicals without proper knowledge especially on the material characteristics as well as safe handling procedure may cause great harm to the workers. Therefore, Safety, Health and Environmental Committee (JKSHE) sees the need to establish a good chemical hazard management to ensure that a safe and healthy workplace and environment is provided. One of the elements in chemical hazard management is to carry out Chemical Hazard Risk Assessment (CHRA). The assessment was done so that decision can be made on suitable control measures upon use of such chemicals, such as induction and training courses to be given to the workers and health surveillance activities that may be needed to protect the workers. For this, JKSHE has recommended to conduct CHRA for one of the laboratories at Secondary Standard Dosimetry Laboratory (SSDL) namely Film Dosimeter Processing Room (dark room) as the initial effort towards a better chemical hazard management. This paper presents the case study where CHRA was conducted to identify the chemical hazards at the selected laboratory, the adequacy of existing control measures and finally the recommendation for more effective control measures. (author)

No abstract available

[en] The personal and area dose monitoring is one of the mandatory requirements enshrined in the Atomic Energy Licensing Act 1984 (Act 304). Personal dose monitoring is essential to ensure that each radiation workers comply with the annual radiation dose limits set of 20 mSv per year while the area dose monitoring is necessary to enable the implementation of appropriate controls on the identified controlled areas. Secondary Standard Dosimetry Laboratory (SSDL), provides two types of dosimeters namely film badge and thermoluminescent dosimeter (TLD) for the purpose of these monitoring. The film badges and TLDs that supplied by SSDL must be returned for dose evaluation at the latest within two months from the date of supply. This paper aims to examine the extent to which users comply the returning period of the film and TLD dosimeters for dose evaluation in SSDL. Statistics of data obtained from the e-SSDL system indicated that the average of film badges returned within two month after supply in 2011 and 2012 is 42 % and 46 % respectively. The overall average return of film badges supplied in 2011 and 2012 is 94 % and 91 % respectively. Statistics of TLD in 2012 (February to December) indicated that the average of TLDs returned within two months after supply is 54 % while the overall average return of TLDs supplied in 2012 is 78 %. (author)

[en] Optically Stimulated Luminescence Dosimeter (OSLD) type penlight (XA) was introduced in Malaysia in 2011. Four years later it has become a major tool for monitoring of personal dose of 18,000 radiation workers in Malaysia. This paper aims to examine the effects produced storage period of reading OSLD. In this study 15 units OSL dosimeters were used in which 3 units are used as a control, while the rest is radiated to 4 different doses of gamma radiation of 0.1 mSv, 0.5 mSv, 10.0 mSv and 5.0 mSv using Cs-137 source. For each radiation dose, 3 units OSL dosimeters were irradiated. Dosimeter readings taken using a reader Landauer - Enlight Auto 200 Reader (No. series: Model: Auto 200; Serial No.: 10720081) and the readings are recorded every month for a period of 16 months starting on Feb 19, 2014 to June 5, 2015. The results obtained indicates that the storage period can cause significant changes to the OSL dosimeter readings. For the dosimeter control, the readings found to have increased by an average of 0.11 mSv per month. While the dosimeter is irradiated, found reading is declining but the rate of decline is dependent on the value of the exposure dose is given. (author)

[en] Since the early 1980's, film badge has been widely used as a device of personal dose monitoring in Malaysia. Secondary Standard Dosimetry Laboratory (SSDL), as a service center for film badge has obtained the supply of personal monitoring film from Agfa Gevaert, Belgium every year. As the uses of film badge have some weaknesses, it has prompted SSDL to find an alternative dosimeter to replace the film badge. Based on the studies that have been conducted, SSDL has selected OSL dosimeter (Optically Stimulated Luminescent Dosimeter) to replace the film badge and is expected to be fully operational by middle of 2015. This paper aims to explain the selection of OSL dosimeter and planning carried out to ensure the success of their application in Malaysia. (author)

[en] This personal dosemeter is important devices for radiation worker when deals with their radiation works. Its use to measure how many dose absorbed and recorded during working. There several personal dosemeter that available in marker such as film batch, TLD batch, Optically Stimulated Luminescence (OSL) and Radio Photo Luminescence (RPL) or glass dosemeter. In Malaysia, film batch are widely used as more of 19000 worker are deal with it. This film will supplied to the worker and each months must be sent to SSDL for measurement. Unfortunately, there are films that returned cannot be read as its damaged or missing. This paper works will revealed how this happen, what are factors that contributes to this problems and how to overcome this problems. Data presented are data gathered from the laboratory since September 2009 until December 2010.(author)

[en] X-ray YXLON Y.MG / XST, Y.MG325 320 kV systems is used in the Secondary Standard Dosimetry Laboratory (SSDL) for the calibration of ionizing radiation measuring devices and also for the research purposes. This machine uses the MGC41 model control unit and is housed in Bunker 1 SSDL, Block 19, Agency Nuclear Malaysia (Nuclear Malaysia). The X-ray generated by this machine is controlled either by using the ON / OFF button on the control panel or by using a shutter mounted between the tube opening and the collimator. If the ON/OFF button is used, the X-rays are generated when the ON button is pressed and vice versa when the OFF button is pressed. Meanwhile, using the shutter method involves the use of high-density material to prevent emission of X-rays when closing the shutter. The shutter OPEN/ CLOSE control is carried out in the control room. The purpose of this paperwork is to assess X-ray leakage from Y.MY / XST YXLON machine at Bunker 1 SSDL when the shutter is in close position. This assessment is important so that appropriate action can be taken to ensure the safety of users of Bunker 1 SSDL. The assessment involves seven X-ray effective energies which are 32 KeV, 47 KeV, 84 KeV, 121 KeV, 171 KeV, 218 KeV and 252 KeV. Leakage X-ray measurements are carried out using the M32002-013 ionizing chamber and PTW-UNIDOS Electrometer: 10001-10464. The measurements were performed at two distances of 0.5 meters and 3.0 meters from the opening of the X-ray tube where the current is set at 7 mA. The data then analysed using Microsoft Excel software. The results of the assessment shows that the leakage of X-ray measured for 171 KeV, 218 KeV and 252 KeV at a distance of 0.5 meters is above 3.0 μSv/ h with the highest value of 26.34 μSv/ h. At a distance of 3.0 meters, only measurements for 252 KeV provide a reading exceeding 3.0 μSv/ hr with a value of 5.06 μSv/ hr. Overall, the maximum value measured in this assessment is still within the permissible limit of 100 μSv/ hr. (author)

[en] This paper presents the statistics on occupational radiation exposures of monitored workers in Malaysia based on records maintained by the SSDL Malaysian Nuclear Agency for a three-year period from 2016 to 2018. Personal dose measurements were obtained monthly using Thermoluminescence Dosimeter (TLD) and Optically Stimulated Luminescence (OSL) Dosimeter. The average number of radiation workers monitored from 2016 to 2018 is about 17,000 per year. These radiation workers are working in three main sectors namely industry, healthcare, and Industrial radiography (NDT). (author)

[en] This paper aims to show the results of customer surveys conducted by Calibration Laboratories, Secondary Standard Dosimetry Laboratories SSDL), Malaysian Nuclear Agency (Nuclear Malaysia) from 2012 to 2016. The implementation of customer surveys is one of the key requirements in accreditation of SAMM MS ISO/IEC 17025:2005 that implemented in SSDL and needs to be conducted on a regular basis. The questionnaire was conducted using the same set of forms each year and the number of respondents selected was between 300 - 500 companies. SSDL has also set out to achieve at least 80 % customer satisfaction index on each year of implementation. In conclusion, the results of 5-year consecutive surveys show that SSDL has achieved a target of over 80% except in 2015 where customer satisfaction is only 78 %. (author)