62 Ci Ir., dose rate @ 71′?
To determine the dose rate from a 62 Curie (Ci) Iridium-192 (Ir) source at a distance of 71 feet, you can use the inverse square law and the specific dose rate constant for Iridium-192.
- Dose Rate Constant: The dose rate constant for Iridium-192 is approximately 4.7 R/hr per Ci at 1 meter or about 0.5 Gy/hr per Ci at 1 meter.
- Distance Conversion: Since you provided the distance in feet, first convert feet to meters:
[71 \text{ ft} \approx 21.64 \text{ m} \quad (1 \text{ ft} \approx 0.3048 \text{ m})] - Using the Inverse Square Law: The dose rate at a distance can be calculated using the formula:
[{Dose Rate} = \frac{{Dose Rate Constant} \times \{Activity}}{(r^2)}]
where ( r ) is the distance in meters. For 62 Ci and using the dose rate constant in R/hr:
[{Dose Rate} = \frac{4.7 \times 62}{(21.64^2)}] - Calculation:
[{Dose Rate} = \frac{291.4}{468.1} \approx 0.623 \{ R/hr}]
So, at a distance of 71 feet, the approximate dose rate from a 62 Ci Iridium-192 source would be about 0.623 R/hr.
If you need the dose rate in Gy/hr, you can similarly convert this using the appropriate conversion factor (1 R ≈ 0.01 Gy), giving approximately 0.0623 Gy/hr.
Always remember that when working with radioactive materials, safety precautions must be observed, and calculations should be validated by using appropriate radiation safety guidelines.
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