f. Minor; minor cuts, bruises, burns (first aid treatment required) 1 High Risk 300 499 – Exposure: E This activity / process must not be implemented without management a. Continuously (or many times daily) 10 approval. b. Frequently (approximately once daily) 6 EXPOSURE Substantial Risk The frequency of c. Occasionally (from once per week to once per month) 3 Unless there is no alternative this 100 299 – exposure to the hazard. d. Infrequent (from once per month to once per year) 2 activity should not be implemented. Requires management approval. e. Rarely (once every 2 - 4 years) 1 f. Very rarely (once every 5 years or more) 0.5 Medium Risk Probability: P Hazard must be examined against 50 - 99 current standards to determine a. Almost certain or expected result 10 PROBABILITY whether adequately controlled. b. Quite possible / not unusual 6 Requires management oversight. Likelihood that the consequence will occur c. Would be an unusual sequence or coincidence 3 once the individual is Low Risk d. Would be a remotely possible coincidence 1 10 - 49 exposed to the hazard. Manage by routine procedures. e. Has never happened after many years of exposure, but is conceivable 0.5 Caution must be observed. f. Practically impossible sequence (has never happened) 0.1 RISK SCORE CONSEQUENCE (C) X EXPOSURE (E) X PROBABILITY (P) = RISK SCORE CALCULATIONS: SECTION 3: HAZARD IDENTIFICATION AND RISK ANALYSIS What you should do for each stage of radiation risk assessment: Hierarchy of control (Control type) Provide hazard description for every activity or process you plan to undertake. 1) Elimination: Can the hazard be eliminated? Most effective Determine the risk score (i.e. the risk without any controls in place) by referencing the 2) Substitution: Less hazardous alternatives. risk score matrix in Section 2. 3) Isolation: Separate operator form risk. Specify the risk control type and control description for each hazard in Section 4. Determine the by again referencing the risk score matrix in 4) Engineering: Re-designing plant or equipment. residual risk score Section 2. 5) Administration: Minimising exposure time, Hierarchy of controls are put in place to decrease the level of hazard. changing SOP, training, Select the most effective controls in preference to least effective ones as much as practicable.
300 – 499 High Risk This activity / process must not be implemented without management approval. f. Minor; minor cuts, bruises, burns (first aid treatment required) 1 EXPOSURE The frequency of exposure to the hazard. Exposure: E a. Continuously (or many times daily) 10 b. Frequently (approximately once daily) 6 100 – 299 Substantial Risk Unless there is no alternative this activity should not be implemented. Requires management approval. c. Occasionally (from once per week to once per month) 3 d. Infrequent (from once per month to once per year) 2 e. Rarely (once every 2 - 4 years) 1 f. Very rarely (once every 5 years or more) 0.5 50 - 99 Medium Risk Hazard must be examined against current standards to determine whether adequately controlled. Requires management oversight. PROBABILITY Likelihood that the consequence will occur once the individual is exposed to the hazard. Probability: P a. Almost certain or expected result 10 b. Quite possible / not unusual 6 c. Would be an unusual sequence or coincidence 3 10 - 49 Low Risk Manage by routine procedures. Caution must be observed. d. Would be a remotely possible coincidence 1 e. Has never happened after many years of exposure, but is conceivable 0.5 f. Practically impossible sequence (has never happened) 0.1 RISK SCORE CALCULATIONS: CONSEQUENCE (C) X EXPOSURE (E) X PROBABILITY (P) = RISK SCORE SECTION 3: HAZARD IDENTIFICATION AND RISK ANALYSIS What you should do for each stage of radiation risk assessment: Hierarchy of control (Control type) Provide hazard description for every activity or process you plan to undertake. Determine the risk score (i.e. the risk without any controls in place) by referencing the risk score matrix in Section 2. Specify the risk control type and control description for each hazard in Section 4. Determine the residual risk score by again referencing the risk score matrix in Section 2. 1) Elimination: Can the hazard be eliminated? Most effective 2) Substitution: Less hazardous alternatives. 3) Isolation: Separate operator form risk. 4) Engineering: Re-designing plant or equipment. 5) Administration: Minimising exposure time, changing SOP, training, Hierarchy of controls are put in place to decrease the level of hazard. Select the most effective controls in preference to least effective ones as much as practicable.
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