The core learning issues are on types of radiation and their biological hazards as well as safe handling and management of radiation hazards.

• Not enough to remove electrons from atoms

• Can heat substances

• Examples are radio waves, visible light, and microwaves.

• Positively charged particles with 2 protons and 2 neutrons from the atom’s nucleus

• Produced from the decay of heavy radioactive elements (uranium, radium and polonium)

• Travels relatively short distances due to their heavy weight (energy used up to travel)

Key Provisions Under Act 304 for Nuclear Research Companies:

Licensing Requirements:

• All nuclear research facilities must obtain licenses from the AELB to operate. This includes licenses for the use, storage, transportation, and disposal of radioactive materials.

• Radiation Safety:

• Employers must establish a Radiation Protection Program that includes measures to minimize radiation exposure to workers, the public, and the environment.

• Radiation Monitoring:

• Continuous radiation monitoring is mandatory in areas where radioactive materials are used. Employers must ensure that radiation levels do not exceed the limits set by the AELB.

• Appointment of a Radiation Protection Officer (RPO):

• Companies are required to appoint a certified Radiation Protection Officer responsible for overseeing radiation safety measures and compliance with regulations.

1. Class A - License for Import and Export

   • Purpose: Authorizes the import and export of radioactive materials, nuclear materials, or equipment capable of producing ionizing radiation.

   • Applicable to: Companies that engage in the cross-border trade of radioactive sources, such as medical isotopes, industrial gauges, or research equipment.

   • Requirements:

• Detailed documentation on the type, quantity, and purpose of the materials.

• Compliance with international shipping and handling standards for radioactive materials.

• A secure storage facility approved by AELB.

2. Class B - License for Manufacturing and Production

   • Purpose: Permits the manufacturing, production, or processing of radioactive materials or nuclear substances.

   • Applicable to: Nuclear research facilities involved in the production of isotopes for medical, industrial, or research purposes.

   • Requirements:

     • A comprehensive Radiation Protection Program (RPP).

     • Safety assessments and environmental impact studies.

     • Implementation of robust waste management protocols.

     • Appointment of a certified Radiation Protection Officer (RPO).

3. Class C - License for Possession and Use

   • Purpose: Allows entities to possess and use radioactive materials, equipment generating ionizing radiation, or nuclear materials.

   • Applicable to: Research institutions, hospitals, universities, and industrial companies using radioactive materials for research, diagnostics, or industrial applications.

   • Requirements:

     • Radiation protection measures, including shielding and monitoring devices.

     • Personal dosimetry and regular health surveillance for workers.

     • Emergency response plans for radiation incidents.

     • Periodic safety audits and inspections.

4. Class D - License for Transportation

   • Purpose: Authorizes the safe transport of radioactive materials within Malaysia.

   • Applicable to: Logistics companies, nuclear research facilities, and medical institutions transporting radioactive sources between locations.

   • Requirements:

     • Compliance with the Radiation Protection (Transport) Regulations 1989.

     • Use of approved containers and vehicles for transporting radioactive materials.

     • Training for personnel involved in the handling and transport of radioactive substances.

     • Detailed transport plans, including routes and emergency procedures.

5. Class E - License for Disposal

   • Purpose: Permits the disposal of radioactive waste and decommissioning of facilities containing radioactive materials.

   • Applicable to: Nuclear research companies, hospitals, and industries looking to dispose of radioactive waste or decommission radiation-emitting equipment.

   • Requirements:

     • Waste characterization and classification according to radioactivity levels.

     • Compliance with the Guidelines on Radioactive Waste Management in Malaysia.

     • Secure and approved disposal facilities.

     • Decommissioning plans that include site assessment, remediation, and radiation clearance verification.

6. Class F - License for Nuclear Power Plant Operation (if applicable)

   • Purpose: This class would be relevant if Malaysia were to operate nuclear power plants.

   • Applicable to: Entities responsible for the construction, commissioning, and operation of nuclear power plants.

   • Requirements:

     • Extensive safety analysis reports (SAR) and environmental impact assessments (EIA).

     • Compliance with international nuclear safety standards, such as those set by the IAEA.

     • Continuous safety and security measures, including the protection of nuclear materials.

Additional Specific Licenses (class H): 

• AELB may issue specific licenses tailored to particular activities or circumstances. 

• License for Research and Development (R&D): For institutions conducting R&D involving radioactive materials or nuclear technology.

• License for Educational Purposes: For universities and educational institutions using radioactive sources for teaching and demonstration purposes.

• License for Medical Applications: For hospitals and clinics using radiotherapy, nuclear medicine, or diagnostic radiology.

In this case, its Class H

• safety standards for radiation protection in workplaces handling radioactive materials.

• ensure that companies comply with safety measures to protect workers, the public, and the environment from radiation hazards.

• set the radiation dose limits for workers and the public, following the guidelines of the International Atomic Energy Agency (IAEA).

Key Requirements:

• Dose Limits:

  • Occupational Exposure: The annual dose limit for workers exposed to ionizing radiation is set at 20 millisieverts (mSv) per year, averaged over five years, with a maximum of 50 mSv in any single year.

  • Public Exposure: The dose limit for the general public is 1 mSv per year.

• Personal Dosimetry:

  • Workers must use personal dosimeters to monitor radiation exposure levels continuously. 

  • dosimeters should be reviewed periodically to ensure compliance with dose limits.

Radiation Protection (Transport) Regulations 1989

• provide guidelines for the safe transport of radioactive materials within the country.

• ensure that radioactive materials are packaged, labelled, and transported safely to minimize the risk of accidents or exposure.

• plays a role in regulating environmental impacts, including those from nuclear activities.

• requires companies to conduct Environmental Impact Assessments (EIAs) for projects that may have significant environmental consequences.

Malaysia Nuclear Power Corporation (MNPC) Policies

• established the MNPC to explore the possibility of nuclear power as part of its energy mix.

• The MNPC is responsible for formulating policies related to the development of nuclear energy, ensuring compliance with international standards.

• IAEA Standards: Provide guidelines on radiation safety, waste management, and emergency preparedness.

• UN Transport Recommendations: Establish protocols for the safe transport of dangerous goods, including radioactive materials.
  National Legislation
  - Countries must implement laws regulating radiation safety (e.g., the Atomic Energy Licensing Act in Malaysia).
  - Regulatory bodies should conduct regular inspections and audits of nuclear facilities.

2. Waste classification

• Low-Level Waste (LLW):

  • Examples: Contaminated clothing, tools, or filters.

  • Management: Incineration or shallow burial in licensed landfills.

• Intermediate-Level Waste (ILW):

  • Examples: Reactor components, resins.

  • Management: Encapsulation in concrete or bitumen before burial in secure facilities.

• High-Level Waste (HLW):

  • Examples: Spent nuclear fuel, highly radioactive isotopes.

  • Management: Encased in steel canisters and stored in deep geological repositories.

3. Inventory and security

   • maintain accurate records of radioactive material inventories

   • implement robust security measures to prevent theft or unauthorized access

4. Decommissioning and disposal

   • Decommission unused radioactive equipment or facilities following safety guidelines.

   • Dispose of radioactive material through licensed facilities.

     
     

Thyroid: Radioactive iodine can build up and cause cancer, particularly during growth.

Lungs: Breathing in radioisotopes can damage DNA.

Stomach: Radioactive isotopes can sit in the stomach and irradiate it for a long time.

Reproductive organs: High doses can cause sterility or mutations.

Skin: Radiation can burn the skin or cause cancer.

Bone marrow: Radiation can cause leukaemia and other diseases of the blood.

• Small, fast-moving particles with negative electrical charge emitted from an atom’s nucleus during decay

• Emitted by unstable atoms such as hydrogen-3 (tritium), carbon-14 and strontium-90

• primary legislation in Malaysia that governs workplace safety across various industries, including nuclear research.

Key Provisions of OSHA 1994 Relevant to Nuclear Companies:

• General Duty of Employers (Section 15):

  • Employers are responsible for ensuring, practicable, the safety, health, and welfare of all employees. This includes protecting them from exposure to hazardous substances like radiation.

• Risk Assessment (Section 16):

  • Employers must conduct risk assessments to identify, evaluate, and control hazards associated with radiation exposure.

• Employee Training and Information (Section 18):

  • Employers must provide adequate training, information, and supervision to workers handling radioactive materials or operating radiation-emitting equipment.

• Health Surveillance (Section 28):

  • Regular health surveillance is required for workers exposed to ionizing radiation to detect any adverse health effects early.

• No electrical charges are emitted from the nuclei of unstable radionuclides

• High-speed nuclear particles that can make objects radioactive

• Can be found in nuclear fission and fusion reactions (nuclear power plants), neutron sources, and particle accelerators

Lower Dose Limit for Pregnant Workers:

• Once a worker declares her pregnancy, the radiation dose limit is reduced to 1 millisievert (mSv) for the entire pregnancy, from the time of declaration until delivery. 

Job Reassignment:

• reassign pregnant workers to duties that minimize radiation exposure, especially away from high-radiation areas, to ensure their safety.

Medical Surveillance:

• Pregnant workers must undergo additional medical check-ups and radiation monitoring to track any exposure throughout the pregnancy.

Radiation Safety Training:

• Employers must provide pregnant workers with information about the potential risks of radiation exposure to the fetus and ensure they understand safety protocols.

• Weightless particles with energy (photons) from the nucleus of unstable and excited atoms

• Pure energy and can travel long distances at high speed

• Emitted along with alpha and beta particles 

• Examples: Iodine-131 (I-131), Cesium-137 (Cs-137), Cobalt-60 (Co-60), cobalt-57 (Co-57), Gallium-67 (G-67), Technetium-99m (Tc-99m), Iridium-192 (Ir-192)

X-rays

• Similar to gamma rays, they are photons with pure energy

• Emitted from outside of the nucleus 

• Lower in energy and less penetrating than gamma rays

• Produced naturally or machines using electricity

Implement a Comprehensive Radiation Protection Program:

• Develop policies and procedures for radiation safety

• use of protective equipment, proper handling of radioactive materials, and emergency response plans.

Regular Safety Audits and Inspections:

• Conduct periodic safety audits and inspections to identify

• comply to radiation protection measures

Training and Certification:

• Provide mandatory training for all employees handling radioactive materials

• ensure they are certified in radiation safety.

Reporting and Documentation:

• Maintain detailed records of radiation exposure for all workers, incidents of radiation leaks, and compliance with safety regulations.

Emergency Preparedness:

• Develop and maintain an emergency response plan for radiation incidents, including evacuation procedures, first aid, and communication protocols.

• National drills and trainings following the guidelines in AELB

1. Decontamination

• Go through a series of decontamination processes, including:

• Removing protective clothing (gloves, suits, masks).

• Washing exposed skin and hair with specialized soap and water.

• Using radiation detectors to check for any residual contamination on the body or clothing.

• All equipment, tools, and vehicles used should be thoroughly cleaned and checked for radioactive contamination before being taken off-site.

2.  Radiation Monitoring and Safety Checks

• Personal Dosimeters: Ensure that all personnel wear dosimeters to monitor their radiation exposure levels. These devices should be checked and recorded regularly.

• Exit Monitors: Use radiation detectors at facility exits to scan individuals, vehicles, and materials for any radioactive contamination before leaving the premises.

• Air Quality Tests: Conduct air quality assessments to detect any airborne radioactive particles.

3. Environmental Monitoring

• Continuous Monitoring: Install environmental monitoring stations around the facility to regularly test soil, water, and air for radiation levels.

• Post-Exit Assessments: After exiting, conduct periodic environmental impact assessments to ensure no radioactive leaks or contamination have occurred.

• Lacks energy to penetrate the outer layer of skin

• Can be harmful if swallowed, inhaled or through wounds; damages living tissues 

• Energy is concentrated in small volumes of cells, severely damaging DNA and cellular structure

  
  

Beta

• Penetrates more than alpha particles, but is relatively less damaging to living tissues and DNA

• Even though they travel long distances, it can be stopped by thin layer of clothing or substances like aluminium

• Some particles can penetrate the skin and cause skin burns

  
  

Neutron

• Can interact with tissues in our body

• Have the potential to cause damage

  
  

Gamma and X-rays

•  easily penetrate barriers that can stop alpha and beta particles, such as skin and clothing

• Can completely pass through our body

• Can cause ionization (process of knocking electrons off atoms and molecules.) resulting in damaged tissues and DNA

• Though both cannot make anything radioactive 

• Cellular Damage:

  • Radiation breaks DNA strands and generates free radicals, disrupting cell function and replication.

  • Rapidly dividing cells (e.g., in bone marrow, gastrointestinal tract, skin) are most vulnerable.

• Ionizing radiation is a carcinogen, increasing the risk of cancers such as leukemia, thyroid, breast, and lung cancer.

• Damage to tumor-suppressor genes (e.g., TP53) or activation of oncogenes can lead to uncontrolled cell growth.

Genetic Mutations:

• Radiation can cause mutations in germ cells (sperm and egg), potentially passing on genetic disorders to offspring.

• In somatic cells, mutations may result in chronic diseases or cancer.

Non-Cancer Diseases:

• Increased risks of cardiovascular diseases, cataracts, and infertility have been observed in individuals exposed to radiation.

Fetal Effects:

Radiation exposure during pregnancy can cause microcephaly, developmental delays, intellectual disabilities, or miscarriage, depending on the dose and timing of exposure.

Plants

Radiation Sensitivity:

• Rapidly growing plants and their seeds are particularly vulnerable. High doses can cause mutations, sterility, or death.

• Chronic low-dose exposure may lead to stunted growth or abnormal development.

Bioaccumulation:

• Plants can absorb radioactive isotopes (e.g., cesium-137, strontium-90) from contaminated soil, which then move up the food chain.

• High radiation doses can cause acute death, sterility, or genetic mutations in wildlife.

• Long-term effects include reduced reproduction rates, cancers, and developmental abnormalities.

Population Dynamics:

• Some populations recover rapidly, while others, particularly top predators, may suffer due to bioaccumulation of radioactive isotopes.

• Radioactive fallout binds to soil particles, contaminating the land.

• Isotopes like cesium-137 and strontium-90 have long half-lives, persisting for decades.

Aquatic Ecosystems:

• Radioactive material can contaminate water bodies, affecting aquatic life.

• Isotopes like iodine-131 and tritium can accumulate in fish, posing risks to predators and humans

• Radiation-induced damage to one species can affect entire food webs.

Example: Decreased reproduction in herbivores may limit food availability for predators.

Genetic Diversity:

• Radiation-induced mutations can reduce genetic diversity, weakening population resilience to environmental changes.

Medical Countermeasures:

• Potassium iodide (KI) pills to block radioactive iodine uptake in the thyroid.

• Chelating agents to remove certain radioactive isotopes.

Monitoring and Treatment:

• Long-term health monitoring and cancer screening for exposed populations.

• Removing topsoil, washing surfaces, and using absorbents in water.

Bioremediation:

• Using plants or microbes to absorb and break down radioactive materials.

Natural Recovery:

• Over time, radiation levels decrease as isotopes decay, but this can take decades to centuries.

• Radiation Monitoring: Regular dosimeter use ensures exposure limits set by IAEA/OSHA are adhered to.

• Controlled Work Areas: Restricted access, shielding, and ventilation minimize high-radiation exposure.

2. Health Surveillance and Monitoring Programs

• Health Checks: Pre-employment screenings and regular monitoring detect potential radiation-related health issues early.

• Genetic Counseling: Family planning employees receive counseling/testing to assess radiation risks on offspring.

• Disclosure Policies: Non-discriminatory policies encourage early pregnancy disclosure for reassignment to low-radiation roles.

• Dosimeter Use: Personalized dosimeters ensure fetal exposure stays below 1 mSv during pregnancy.

  
  

4. Comprehensive Training and Education

• Awareness Programs: Workers learn about radiation risks, protective measures, and emergency protocols, with focus on reproductive health.

• Preparedness Drills: Regular drills prepare employees for radiation leaks or spills.

• Health Monitoring: Long-term post-employment health tracking addresses delayed radiation effects, particularly for pregnant employees.

• Offspring Care: Healthcare benefits cover children's check-ups for potential radiation-linked developmental or genetic issues.

6. Research and Safer Technologies

• Radiation Alternatives: Non-radioactive processes reduce radiation use.

• Shielding Innovations: Advanced materials improve workplace radiation protection.

• Protocol Updates: Regularly updated safety measures align with new scientific advancements and standards

• This mutation will NOT be passed down to generations, only affects the current individual

• This type of mutation will last the whole lifespan of the individual

• The radiation will affect both the mother’s cells and the fetus’ cells

• This radiation can later cause birth defects or developmental abnormalities later on in the fetus’ life

Sensitivity: Highly sensitive; even low radiation doses can cause cell death.

All-or-Nothing Effect: Radiation either causes embryonic death or has no long-term impact due to totipotent cell repair mechanisms.

Effects: Loss of pregnancy if critical cells are damaged. Surviving embryos show no congenital anomalies.

• Organogenesis Stage (2–8 Weeks Post-Fertilization)

Malformations: High sensitivity to structural deformities as organs begin to form.

CNS Damage: Impaired brain and spinal cord development.

Growth Restriction: Damage to growing cells results in stunted overall growth.

• Fetal Period (9 Weeks to Birth)

Neurological Impact: Cognitive disabilities such as reduced IQ, learning difficulties, or mental retardation.

Growth Delays: Reduced birth weight and height.

Cancer Risk: Higher lifetime risk of cancers, particularly leukemia.

Eye Defects: Malformations or cataracts with exposure during eye formation.

Skeletal Abnormalities: Defective bone development during the organogenesis stage.

Fetal Death: High radiation doses may lead to miscarriage or stillbirth.

Moderate Doses (100–500 mGy): Increased likelihood of growth restrictions and neurological effects.

High Doses (>500 mGy): Severe developmental issues, including malformations and potential fetal death.

Genetic Mutations: Potential heritable mutations due to germ cell damage.

Threshold: Doses >0.1 Gy can prevent implantation due to cell damage.

Outcome: Embryo death without congenital abnormalities if implantation occurs.

• Organogenesis Period (2–8 Weeks Post-Conception)

Threshold: Doses >0.5 Gy can cause severe organ malformations, growth restriction, and CNS damage.

Fetal Development (8–25 Weeks Post-Conception)

Key Window: Weeks 8–15 are critical for brain development; 1 Gy dose results in ~40% risk of intellectual disabilities.

Later Sensitivity: Risks reduce after 15 weeks but remain significant through week 25.

• Later Pregnancy (After 25 Weeks)

Decreased Sensitivity: The fetus is less vulnerable, but high doses may still affect growth and pose cancer risks.