Is there a major error in the NSW regs review?
I finally managed to read the 'Review of NSW RC Act 1990' document and have a very strong suspicion that a major error may have been made - which throws most arguments about what's radioactive and what's not into total disarray:
The value in NSW (100 Bq/g) is compared directly with 1 Bq/g from NDRP and, of course, it looks completely deadly - 100-times decrease!
100 Bq/g was calculated for ‘total activity’: Th ppm × 4.1 × 10 (to account for all 10 radioisotopes in the chain)
1 Bq/g is for the ‘parent radioisotope' only: Th ppm × 4.1
Example of calculation for typical zircon sand (220 ppm Th + 250 ppm U):
Specific activity calculated as per NDRP (and almost elsewhere in the world):
[220 × 4.1 + 250 × 12.5] / 1000 = 4 Bq/g
Specific activity calculated as per NSW:
[220 × 4.1 × 10 + 250 × 12.5 × 14] / 1000 = 53 Bq/g
Then some proposals are made about having the materials 'up to 30 times of NDRP levels' not regulated, or something like that... Based on what way of calculating it...? There is no specification in the document at all.
There are some other points in the document, but the time for comments has expired in late February. Could someone from NSW please let me know what is happening and if I am correct in my comment above?
Any additional information will be very much appreciated.
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