Categories

Login

Lynas Issue by Dr. HW Looi >>>

On thorium and Lynas by Chan Chee Khoon and its reply by Ng Ai Soo

(adsbygoogle = window.adsbygoogle || []).push({});

MARCH 27 — The Sun declined to publish my response (below) to Dr Looi Hoong Wah’s earlier letter. In the interest of reasoned exchanges, I hope this response to Dr Looi’s latest letter sees the light of day.

In this letter, Dr Looi’s cites the Argonne National Lab’s fact sheet on thorium to argue that only a miniscule portion of thorium-232 which is ingested via food or water is absorbed into the bloodstream, of which only 4 per cent gets deposited in the liver where it is retained with a biological half-life of 700 days.

He neglects to mention that thorium-232 is much more readily absorbed into the human body via an inhalation route, and furthermore that 70 per cent of the amount entering the bloodstream gets deposited in bone where it is retained with a biological half-life of about 22 years, all that while irradiating the much more radio-sensitive blood-forming tissues there with highly mutagenic alpha-particles (20 times more damaging to cellular genetic material than beta or gamma radiation).

Could this be the reason for the cluster of childhood leukaemias observed among the children of Bukit Merah? (Recall also the inverse square […]